وزارة الدفاع (جائزة فكرة W81XWH-07-0406) - لأتاسوي اولوس NIH RO1 A1080870 - لأتاسوي اولوس NIH R21 A1079341 - لأتاسوي اولوس جامعة ميسوري صناديق المؤسسية - لأتاسوي اولوس

<ol>
	<li>Calaluce, R., Gubin, M. M., Davis, J. W., Magee, J. D., Chen, J., Kuwano, Y., Gorospe, M., Atasoy, U. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+RNA+binding+protein+HuR+differentially+regulates+unique+subsets+of+mRNAs+in+estrogen+receptor+negative+and+estrogen+receptor+positive+breast+cancer.">The RNA binding protein HuR differentially regulates unique subsets of mRNAs in estrogen receptor negative and estrogen receptor positive breast cancer.</a> BMC Cancer. 10, 126-140 (2010).</li><li>Gubin, M. M., Calaluce, R., Davis, J. W., Magee, J. D., Strouse, C. S., Shaw, D. P., Ma, L., Brown, A., Hoffman, T., Rold, T. 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D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genome-wide+regulatory+analysis+using+en+masse+nuclear+run-ons+and+ribonomic+profiling+with+autoimmune+sera.">Genome-wide regulatory analysis using en masse nuclear run-ons and ribonomic profiling with autoimmune sera.</a> Gene. 317, 79-87 (2003).</li><li>Tenenbaum, S. A., Carson, C. C., Lager, P. J., Keene, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identifying+mRNA+subsets+in+messenger+ribonucleoprotein+complexes+by+using+cDNA+arrays.">Identifying mRNA subsets in messenger ribonucleoprotein complexes by using cDNA arrays.</a> Proc. Natl. Acad. Sci. U.S.A. 97, 14085-14090 (2000).</li><li>Baroni, T. E., Chittur, S. V., George, A. D., Tennebaum, S. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Advances+in+RIP-Chip+Analysis.">Advances in RIP-Chip Analysis.</a> Methods in Molecular Biology. 419, 93-108 (2008).</li><li>de Silanes Lopez, I., Zhan, M., Lal, A., Yang, X., Gorospe, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Identification+of+a+target+RNA+motif+for+RNA-binding+protein+HuR.">Identification of a target RNA motif for RNA-binding protein HuR.</a> Proc. Natl. Acad. Sci. U.S.A. 101, 2987-2992 (2004).</li><li>de Silanes Lopez, I., Lal, A., Gorospe, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=HuR:+post-transcriptional+paths+to+malignancy.">HuR: post-transcriptional paths to malignancy.</a> RNA Biol. 2, 11-13 (2005).</li><li>Grigull, J., Mnaimneh, S., Pootoolal, J., Robinson, M. D., Hughes, T. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genome-wide+analysis+of+mRNA+stability+using+transcription+inhibitors+and+microarrays+reveals+posttranscriptional+control+of+ribosome+biogenesis+factors.">Genome-wide analysis of mRNA stability using transcription inhibitors and microarrays reveals posttranscriptional control of ribosome biogenesis factors.</a> Mol. Cell Biol. 24, 5534-5547 (2004).</li><li>Hieronymus, H., Silver, P. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genome-wide+analysis+of+RNA-protein+interactions+illustrates+specificity+of+the+mRNA+export+machinery.">Genome-wide analysis of RNA-protein interactions illustrates specificity of the mRNA export machinery.</a> Nat. Genet. 33, 155-161 (2003).</li><li>Hieronymus, H., Yu, M. C., Silver, P. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Genome-wide+mRNA+surveillance+is+coupled+to+mRNA+export.">Genome-wide mRNA surveillance is coupled to mRNA export.</a> Genes Dev. 18, 2652-2662 (2004).</li><li>Mukherjee, N., Corcoran, D. L., Nusbaum, J. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Integrative+Regulatory+Mapping+Indicates+that+the+RNA-Binding+Protein+HuR+Couples+Pre-mRNA+Processing+and+mRNA+Stability.">Integrative Regulatory Mapping Indicates that the RNA-Binding Protein HuR Couples Pre-mRNA Processing and mRNA Stability.</a> Molecular Cell. 43, 1-13 (2011).</li></ol>

الكتاب تعلن أنه ليس لديهم المصالح المتنافسة.

ونظرا لطبيعة هذا التحسين، والتجربة والخبرة تكون مضمونة فقط الطرق للحصول على النتائج المرجوة بنجاح. في العديد من الخطوات من هذا الإجراء، ودرجة الحرارة والمعالجة الفعالة للالكواشف والمنتجات هي ذات أهمية حاسمة. والتخطيط السليم وتنفيذ تقنية مساعدة تأكد من أن تم إجراء التجربة في إطار زمني مناسب في درجات الحرارة المثلى الموصى بها. ومن القضايا الرئيسية مع التجارب العزلة RNA هو حساسية من RNAs إلى تدهور من RNases. جميع الكواشف يجب أن تكون حرة وريبونوكلياز المخزنة أو المستخدمة في ريبونوكلياز خالية الحاويات. هذا هو خطوة حاسمة في ضمان سلامة العينة مرنا الخاص بك. حتى عندما يتم تنفيذ التجربة بشكل صحيح، ومع ذلك، قد لا يمكن تحقيق النتيجة المرجوة نظرا لطبيعة التفاعل بين الممارسات التجارية التقييدية وmRNAs وهدفها. مشكلة واحدة محتملة هو وجود منخفض أو حتى أي إشارة من RNA عزلها تشيب-RIP.على الرغم من أنه قد تكون هناك إشارة من الحمض النووي الريبي مجموع، وهذا قد يكون نتيجة لعدم كفاية البروتين ملزمة يجري سحب من قبل الخرز. الخطوة الأولى هي استكشاف الأخطاء وإصلاحها للتأكد من أن المحللة الخلوية المستخدمة لديها التعبير الكافي للRBP محددة. بعد تأكيد، قد يتم عزل البروتين بعد غسل NT2 النهائي ومعلق في المخزن المؤقت أو آخر Laemmli العازلة المناسبة يبدل طبيعة ويسخن في 95 درجة مئوية لمدة 5 دقائق. ويمكن استخدام تحليل لطخة غربية على هذه العينات المحللة في التنسيق مع المدخلات وكذلك الضوابط السلبية لضمان ما يكفي من هدم للبروتين المرتبطة بها. وعلاوة على ذلك، لأن lysing الخلية هو مطلوب للوصول إلى هذه المكونات، قد يتم عرض إمكانية التفاعلات غير طبيعي وغير المرغوب فيها بين البروتينات وفصلها عادة مرنا. يمكن ربط هذه التفاعلات المحتملة و&quot;امتصاص&quot; mRNAs والهدف الخاص بك أو البروتينات من خلال التفاعلات غير محددة ملزمة. بالإضافة إلى ذلك، شارك في هذه البروتينات متفاوتةيمكن nditions أضعاف في أشكال متعددة والزخارف التي قد تصبح ملزمة لا يمكن الوصول إليها لmRNAs وهدفهم، ومنع تفاعلها. كل من هذه تعزيز أهمية العمل بكفاءة وكذلك الاستفادة من درجات الحرارة المثلى للحد من سرد هذه التفاعلات غير المرغوب فيها. بالإضافة إلى ذلك، سوف الأمثل لغسل الظروف لكل بروتين هدف معين تكون حاسمة لتحقيق أقصى قدر من التفاعل نقاء. قد تكون هناك حاجة غسل ظروف أكثر صرامة. على سبيل المثال، قد يتم استكمال العازلة غسل SDS أو مع مبلغ مناسب من اليوريا للحد من التفاعلات غير محددة والخلفية في الناتج إشارة. سيكون هذا تعتمد اعتمادا كليا على الممارسات التجارية التقييدية في الهدف المجرب وكذلك مرنا الهدف في ظروفها الفسيولوجية فريدة من نوعها. فإن بعض الظروف لا تكون مناسبة لبعض أدوات التحليل مرنا، والتي تجدر الإشارة في إعداد العينات. وأخيرا، على الرغم من RIP ناجحا في إثراء RNARBP-التفاعلات، مشكلة معروفة بشكل جيد مع طريقة (CHIP) RIP هو عدم القدرة على التعرف على مجالات محددة ملزمة للRBP على الأهداف مرنا عابرة. ويمكن استخدام العديد من التقنيات عبر ربط تليها RIP لعزل الأهداف تسلسل فريد، إلا أن استخدام الأشعة فوق البنفسجية قصيرة الموجة يميل إلى أن يؤدي إلى تلف الحمض النووي. وهناك طريقة جديدة تعرف باسم CLIP-PAR، أو photoactivatable يشابك ريبونوكليوزيد وimmuoprecipitation، ويعمل منذ فترة طويلة موجة الأشعة فوق البنفسجية لدمج thiouridine إلى RNA الوليدة السماح تحديد مواقع الربط فريدة من التفاعلات RNA سواء مستقرة وعابرة. وعموما، تم تأسيس RIP-الرقاقة، أداة ممتازة تستخدم لعزل ودراسة التفاعلات بين البروتينات RNA ملزم والأهداف مرنا من خلال مجموعتنا وكذلك العديد من المجموعات البحثية الأخرى. على الرغم من الطبيعة الحساسة في والممارسة، وحسن تنفيذ هذا الإجراء يحقق عزلة هذه المجمعات RNP، التي كانت حتى وقت قريب، كانت inaccessible لاكتشاف وتحليل.

<table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> اسم الكاشف </td><td> شركة </td><td> كتالوج رقم </td><td> تعليقات </td></tr><tr><td> 1 M dithiothreitol </td><td> الصياد </td><td> BP172-5 </td><td> DTT </td></tr><tr><td> الدناز 1 </td><td> Ambion </td><td> 2235 </td><td> ريبونوكلياز مجانا </td></tr><tr><td> Ethylendiamine حمض Tetraccetic </td><td> الصياد </td><td> BP118-500 </td><td> EDTA </td></tr><tr><td> الجليكوجين </td><td> Ambion </td><td> 9516 </td><td></td></tr><tr><td> 1 HEPES </td><td> سيجما </td><td> H3375-100G </td><td> درجة الحموضة 7.0 </td></tr><tr><td> Igepal Nonidet P-40 </td><td> USB </td><td> 78641 </td><td> NP40 </td></tr><tr><td> 1 M بوكل </td><td> الصياد </td><td> BP366-500 </td><td></td></tr><tr><td> 1 M MgCl 2 </td><td> الصياد </td><td> BP214-500 </td><td></td></tr><tr><td> NT2 العازلة </td><td> * انظر أدناه </td><td></td><td></td></tr><tr><td> Polysome يزيس العازلة </td><td> * انظر أدناه </td><td></td><td></td></tr><tr><td> أقراص البروتيني المثبط كوكتيل </td><td> روش </td><td> 11873580001 </td><td></td></tr><tr><td> البروتين A sepharose و الخرز </td><td> سيجما </td><td> P3391 </td><td></td></tr><tr><td> بروتين K </td><td> الصياد </td><td> BP1700-100 </td><td></td></tr><tr><td> ريبونوكلياز المانع خارج ريبونوكلياز </td><td> إينفيتروجن </td><td> 10777-019 </td><td> 40 U / ميكرولتر </td></tr><tr><td> 1 M كلوريد الصوديوم </td><td> الصياد </td><td> BP358-212 </td><td></td></tr><tr><td> كبريتات الصوديوم دوديسيل </td><td> الصياد </td><td> BP166-500 </td><td> SDS </td></tr><tr><td> 1 M تريس، حمض الهيدروكلوريك </td><td> الصياد </td><td&gt; BP153-500 </td><td> درجة الحموضة 7.4 </td></tr><tr><td> Trizol </td><td> إينفيتروجن </td><td> 15596-026 </td><td></td></tr><tr><td> مجمعات ريبونوكليوزيد Vanadyl </td><td> مختبرات نيو إنجلاند </td><td> S1402S </td><td> VRC </td></tr></tbody></table> <table border="1" style=";text-align:right;direction:rtl"><tbody><tr><td> كاشف Workup </td></tr><tr><td> إعداد الكواشف في ريبونوكلياز / الدناز الحرة، DEPC المعالجة الأواني الزجاجية </td></tr><tr><td> Polysome تحلل العازلة </td></tr><tr><td> 100 ملي مول بوكل </td></tr><tr><td> 5 ملم MgCl 2 </td></tr><tr><td> 10 HEPES ملي (الرقم الهيدروجيني 7.0) </td></tr><tr><td> 0.5٪ NP40 </td></tr><tr><td> 1 ملم DTT </td></tr><tr><td> 100 وحدة / مل ريبونوكلياز المغادرة </td></tr><tr><td> 400 ميكرومتر VRC </td></tr><tr><td> قرص البروتيني المثبط كوكتيل </td></tr><tr><td> 5 مل من العازلة تحلل Polysome </td></tr><tr><td> إضافة 50 ميكرولتر من HEPES M 1 (درجة الحموضة 7.0) </td></tr><tr><td> 500 ميكرولتر من KCL M 1 </td></tr><tr><td> سعة 25 ميكرولتر من MgCl M 1 2 </td></tr><tr><td> سعة 25 ميكرولتر من NP40 </td></tr><tr><td> 4،7 مل ريبونوكلياز الدناز خالية H 2 O </td></tr><tr><td> 50 ميكرولتر من DTT M 1 </td></tr><tr><td> 12،5 ميكرولتر من 100 U / مل ريبونوكلياز المغادرة </td></tr><tr><td> 200 ميكرولتر كوكتيل مثبط البروتياز (المنحلة وفقا لالصانع) </td></tr><tr><td> 10 ميكرولتر 200 ملي مول VRC (في وقت الاستخدام) </td></tr><tr><td> NT2 العازلة </td></tr><tr><td> 50 ملي تريس، حمض الهيدروكلوريك (درجة الحموضة 7.4) </td></tr><tr><td> 150 مم كلوريد الصوديوم </td></tr><tr><td> 1 ملم MgCl 2 </td></tr><tr><td> 0.05٪ NP40 </td></tr><tr><td> 1 L من الاحتياطي NT2 </td></tr><tr><td> 50 مل تريس (درجة الحموضة 7.4) </td></tr><tr><td> 30 مل 5 M كلوريد الصوديوم </td></tr><tr><td> 1 مل 1 M MgCl <suب&gt; 2 </td></tr><tr><td> 500 ميكرولتر NP40 </td></tr><tr><td> 820 مل ريبونوكلياز الدناز خالية H 2 O </td></tr></tbody></table>

method for the isolation and identification of mrnas, micrornas and protein components of ribonucleoprotein complexes from cell extracts using rip-chip

نتيجة لتطور الإنتاجية العالية وكفاءة تحليل تسلسل ميكروأري، أصبحت عالمية تحليل التعبير الجيني شكل سهلة ومتاحة بسهولة لجمع البيانات. في مجال البحوث والنماذج كثيرة المرض غير أن مستويات ثابتة من الدولة مرنا الجينات المستهدفة دائما لا ترتبط مباشرة مع ثابت مستويات البروتين الدولة. بعد النسخي تنظيم الجينات هو التفسير المحتمل لاختلاف بين الاثنين. مدفوعا من البروتينات ملزمة RNA ملزم (RBP)، بعد النسخي التنظيم مرنا يؤثر التوطين والاستقرار والترجمة من خلال تشكيل بروتين نووي ريبوزي (RNP) المعقدة مع mRNAs والهدف. تحديد هذه مرنا غير معروف نوفو دي من الأهداف مقتطفات الخلوية في مجمع RNP محورية لفهم آليات ومهام RBP وتأثيرها على الإنتاج مما أدى البروتين. هذا البروتوكول يحدد طريقة تسمى RNP مناعي-ميكروأري (RIP-رقاقة)، ​​والذي يسمح لتحديد من لياليmRNAs وpecific المرتبطة في مجمع بروتين نووي ريبوزي، في ظل الظروف التجريبية المتغيرة، جنبا إلى جنب مع مزيد من الخيارات لتحسين تجربة للباحث على حدة. مع هذه الأداة التجريبية الهامة، يمكن للباحثين استكشاف الآليات المعقدة المرتبطة تنظيم الجينات في مرحلة ما بعد النسخي وكذلك التفاعلات بروتين نووي ريبوزي أخرى.

Watch this Scientific Journal Video about Method for the Isolation and Identification of mRNAs, microRNAs and Protein Components of Ribonucleoprotein Complexes from Cell Extracts using RIP-Chip at JoV

Method for the Isolation and Identification of mRNAs, microRNAs and Protein Components of Ribonucleoprotein Complexes from Cell Extracts using RIP-Chip

A خطوة خطوة لعزل بروتوكول وتحديد مجمعات RNA المرتبطة بها من خلال رقاقة-RIP.

طريقة لعزل وتحديد من microRNAs، وmRNAs ومكونات البروتين من بروتين نووي ريبوزي مجمعات من مقتطفات خلية باستخدام رقاقة RIP

As a result of the development of high-throughput sequencing and efficient microarray analysis, global gene expression analysis has become an easy and ...

method-for-isolation-identification-mrnas-micrornas-protein

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Biology

27.4K Views.  University of Missouri. A خطوة خطوة لعزل بروتوكول وتحديد مجمعات RNA المرتبطة بها من خلال رقاقة-RIP.

Video: Method for the Isolation and Identification of mRNAs, microRNAs and Protein Components of Ribonucleoprotein Complexes from Cell Extracts using RIP-Chip

Preparation and Fractionation of Xenopus laevis Egg Extracts

Crude and fractionated Xenopus egg extracts can be used to provide ingredients for reconstituting cellular processes for morphological and biochemical analysis. Egg lysis and differential centrifugation are used to prepare the crude extract which in turn in used to prepare fractionated extracts and light membrane preparations.

Crude and fractionated Xenopus egg extracts can be used to provide ingredients for reconstituting cellular processes for morphological and biochemical analysis. Egg lysis and differential centrifugation are used to prepare the crude extract which in turn in used to prepare fractionated extracts and light membrane preparations.

إعداد والتقطير من البيض مقتطفات القيطم المورق

Crude and fractionated Xenopus egg extracts can be used to provide ingredients for reconstituting cellular processes for morphological and biochemical ...

Purification and Visualization of Influenza A Viral Ribonucleoprotein Complexes

The influenza A viral genome consists of eight negative-sense, single stranded RNA molecules, individually packed with multiple copies of the influenza A nucleoprotein (NP) into viral ribonulceoprotein particles (vRNPs). The influenza vRNPs are enclosed within the viral envelope. During cell entry, however, these vRNP complexes are released into the cytoplasm, where they gain access to the host nuclear transport machinery. In order to study the nuclear import of influenza vRNPs and the replication of the influenza genome, it is useful to work with isolated vRNPs so that other components of the virus do not interfere with these processes. Here, we describe a procedure to purify these vRNPs from the influenza A virus. The procedure starts with the disruption of the influenza A virion with detergents in order to release the vRNP complexes from the enveloped virion. The vRNPs are then separated from the other components of the influenza A virion on a 33-70% discontinuous glycerol gradient by velocity sedimentation. The fractions obtained from the glycerol gradient are then analyzed on via SDS-PAGE after staining with Coomassie blue. The peak fractions containing NP are then pooled together and concentrated by centrifugation. After concentration, the integrity of the vRNPs is verified by visualization of the vRNPs by transmission electron microscopy after negative staining. The glycerol gradient purification is a modification of that from Kemler et al. (1994)1, and the negative staining has been performed by Wu et al. (2007).2

The genome of the influenza A virus consists of eight separate complexes of RNA and proteins, termed viral ribonucleoprotein complexes (vRNPs). This paper describes the glycerol gradient purification and transmission electron microscopy visualization of influenza A vRNPs.

تنقية والتخيل من الأنفلونزا من المجمعات بروتين نووي ريبوزي الفيروسية

The influenza A viral genome consists of eight negative-sense, single stranded RNA molecules, individually packed with multiple copies of the influenza A ...

Identification of protein complexes with quantitative proteomics in S. cerevisiae

Lipids are the building blocks of cellular membranes that function as barriers and in compartmentalization of cellular processes, and recently, as important intracellular signalling molecules. However, unlike proteins, lipids are small hydrophobic molecules that traffic primarily by poorly described nonvesicular routes, which are hypothesized to occur at membrane contact sites (MCSs). MCSs are regions where the endoplasmic reticulum (ER) makes direct physical contact with a partnering organelle, e.g., plasma membrane (PM). The ER portion of ER-PM MCSs is enriched in lipid-synthesizing enzymes, suggesting that lipid synthesis is directed to these sites and implying that MCSs are important for lipid traffic. Yeast is an ideal model to study ER-PM MCSs because of their abundance, with over 1000 contacts per cell, and their conserved nature in all eukaryotes. Uncovering the proteins that constitute MCSs is critical to understanding how lipids traffic is accomplished in cells, and how they act as signaling molecules. We have found that an ER called Scs2p localize to ER-PM MCSs and is important for their formation. We are focused on uncovering the molecular partners of Scs2p. Identification of protein complexes traditionally relies on first resolving purified protein samples by gel electrophoresis, followed by in-gel digestion of protein bands and analysis of peptides by mass spectrometry. This often limits the study to a small subset of proteins. Also, protein complexes are exposed to denaturing or non-physiological conditions during the procedure. To circumvent these problems, we have implemented a large-scale quantitative proteomics technique to extract unbiased and quantified data. We use stable isotope labeling with amino acids in cell culture (SILAC) to incorporate staple isotope nuclei in proteins in an untagged control strain. Equal volumes of tagged culture and untagged, SILAC-labeled culture are mixed together and lysed by grinding in liquid nitrogen. We then carry out an affinity purification procedure to pull down protein complexes. Finally, we precipitate the protein sample, which is ready for analysis by high-performance liquid chromatography/ tandem mass spectrometry. Most importantly, proteins in the control strain are labeled by the heavy isotope and will produce a mass/ charge shift that can be quantified against the unlabeled proteins in the bait strain. Therefore, contaminants, or unspecific binding can be easily eliminated. By using this approach, we have identified several novel proteins that localize to ER-PM MCSs. Here we present a detailed description of our approach. 

Here we describe a new quantitative proteomics technique for identifying protein complexes in Saccharomyces cerevisiae. In this study, we have used the SILAC method together with affinity purification followed by tandem mass spectrometry to identify with high specificity the binding partners of an ER protein, Scs2p.

تحديد بروتين المجمعات مع كمية البروتينات في البيرة س.

Lipids are the building blocks of cellular membranes that function as barriers and in compartmentalization of cellular processes, and recently, as ...

Using the GELFREE 8100 Fractionation System for Molecular Weight-Based Fractionation with Liquid Phase Recovery

The GELFREE 8100 Fractionation System is a novel protein fractionation system designed to maximize protein recovery during molecular weight based fractionation. The system is comprised of single-use, 8-sample capacity cartridges and a benchtop GELFREE Fractionation Instrument. During separation, a constant voltage is applied between the anode and cathode reservoirs, and each protein mixture is electrophoretically driven from a loading chamber into a specially designed gel column gel. Proteins are concentrated into a tight band in a stacking gel, and separated based on their respective electrophoretic mobilities in a resolving gel. As proteins elute from the column, they are trapped and concentrated in liquid phase in the collection chamber, free of the gel. The instrument is then paused at specific time intervals, and fractions are collected using a pipette. This process is repeated until all desired fractions have been collected. If fewer than 8 samples are run on a cartridge, any unused chambers can be used in subsequent separations.
This novel technology facilitates the quick and simple separation of up to 8 complex protein mixtures simultaneously, and offers several advantages when compared to previously available fractionation methods. This system is capable of fractionating up to 1mg of total protein per channel, for a total of 8mg per cartridge. Intact proteins over a broad mass range are separated on the basis of molecular weight, retaining important physiochemical properties of the analyte. The liquid phase entrapment provides for high recovery while eliminating the need for band or spot cutting, making the fractionation process highly reproducible1.

The accompanying video describes the use of the GELFREE 8100 Fractionation System, which partitions complex protein samples on the basis of molecular weight and recovers the fractions in liquid phase. The video describes how the technology works, how it is used, and provides resultant data, with polyacrylamide gel electrophoresis analysis of fractionated bovine liver homogenate.

باستخدام نظام التقطير GELFREE 8100 لتقطير الوزن الجزيئي وبناء مع مرحلة الانتعاش السائل

The GELFREE 8100 Fractionation System is a novel protein fractionation system designed to maximize protein recovery during molecular weight based ...

Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography

The dynamic nature of cellular machineries is frequently built on transient and/or weak protein associations. These low affinity interactions preclude stringent methods for the isolation and identification of protein networks around a protein of interest. The use of chemical crosslinkers allows the selective stabilization of labile interactions, thus bypassing biochemical limitations for purification. Here we present a protocol amenable for cells in culture that uses a homobifunctional crosslinker with a spacer arm of 12 &Aring;, dithiobis-(succinimidyl proprionate) (DSP). DSP is cleaved by reduction of a disulphide bond present in the molecule. Cross-linking combined with immunoaffinity chromatography of proteins of interest with magnetic beads allows the isolation of protein complexes that otherwise would not withstand purification. This protocol is compatible with regular western blot techniques and it can be scaled up for protein identification by mass spectrometry1.
Stephanie A. Zlatic and Pearl V. Ryder contributed equally to this work.

Isolation of Labile Multi-protein Complexes by in vivo Controlled Cellular Cross-Linking and Immuno-magnetic Affinity Chromatography

The cell permeable crosslinker DSP [dithiobis-(succinimidyl propionate)] stabilizes transient and labile interactions in vivo, which allows their isolation using stringent protein complex purification techniques. Here we present a technique for crosslinking cells grown in culture followed by isolation of protein complexes by immunoprecipitation.

عزل بروتين المجمعات المتعددة التي كتبها عطوب في الجسم الحي الشواهد الخلوية عبر ربط والمناعة المغناطيسي اللوني التقارب

The dynamic nature of cellular machineries is frequently built on transient and/or weak protein associations. These low affinity interactions preclude ...

Identification and Characterization of Protein Glycosylation using Specific Endo- and Exoglycosidases

Glycosylation, the addition of covalently linked sugars, is a major post-translational modification of proteins that can significantly affect processes such as cell adhesion, molecular trafficking, clearance, and signal transduction1-4. In eukaryotes, the most common glycosylation modifications in the secretory pathway are additions at consensus asparagine residues (N-linked); or at serine or threonine residues (O-linked) (Figure 1). Initiation of N-glycan synthesis is highly conserved in eukaryotes, while the end products can vary greatly among different species, tissues, or proteins. Some glycans remain unmodified ("high mannose N-glycans") or are further processed in the Golgi ("complex N-glycans"). Greater diversity is found for O-glycans, which start with a common N-Acetylgalactosamine (GalNAc) residue in animal cells but differ in lower organisms1.
The detailed analysis of the glycosylation of proteins is a field unto itself and requires extensive resources and expertise to execute properly. However a variety of available enzymes that remove sugars (glycosidases) makes possible to have a general idea of the glycosylation status of a protein in a standard laboratory setting. Here we illustrate the use of glycosidases for the analysis of a model glycoprotein: recombinant human chorionic gonadotropin beta (hCG&beta;), which carries two N-glycans and four O-glycans 5. The technique requires only simple instrumentation and typical consumables, and it can be readily adapted to the analysis of multiple glycoprotein samples.
Several enzymes can be used in parallel to study a glycoprotein. PNGase F is able to remove almost all types of N-linked glycans6,7. For O-glycans, there is no available enzyme that can cleave an intact oligosaccharide from the protein backbone. Instead, O-glycans are trimmed by exoglycosidases to a short core, which is then easily removed by O-Glycosidase. The Protein Deglycosylation Mix contains PNGase F, O-Glycosidase, Neuraminidase (sialidase), &beta;1-4 Galactosidase, and &beta;-N-Acetylglucosaminidase. It is used to simultaneously remove N-glycans and some O-glycans8 . Finally, the Deglycosylation Mix was supplemented with a mixture of other exoglycosidases (&alpha;-N-Acetylgalactosaminidase, &alpha;1-2 Fucosidase, &alpha;1-3,6 Galactosidase, and &beta;1-3 Galactosidase ), which help remove otherwise resistant monosaccharides that could be present in certain O-glycans.
SDS-PAGE/Coomasie blue is used to visualize differences in protein migration before and after glycosidase treatment. In addition, a sugar-specific staining method, ProQ Emerald-300, shows diminished signal as glycans are successively removed. This protocol is designed for the analysis of small amounts of glycoprotein (0.5 to 2 &mu;g), although enzymatic deglycosylation can be scaled up to accommodate larger quantities of protein as needed.

Using specific glycosidases to remove sugars from glycoproteins followed by SDS-PAGE is a valuable method to detect glycan modifications on protein samples and is a good choice for initial glycobiology studies. Changes following deglycosylation can be detected as shifts in gel mobility or by staining with glycan sensitive reagents.

تحديد وتوصيف ارتباط بالغليكوزيل باستخدام بروتين معين إندو وexoglycosidases

Glycosylation, the addition of covalently linked sugars, is a major post-translational modification of proteins that can significantly affect processes ...

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

Since most cellular processes are mediated by macromolecular assemblies, the systematic identification of protein-protein interactions (PPI) and the identification of the subunit composition of multi-protein complexes can provide insight into gene function and enhance understanding of biological systems1, 2. Physical interactions can be mapped with high confidence vialarge-scale isolation and characterization of endogenous protein complexes under near-physiological conditions based on affinity purification of chromosomally-tagged proteins in combination with mass spectrometry (APMS). This approach has been successfully applied in evolutionarily diverse organisms, including yeast, flies, worms, mammalian cells, and bacteria1-6. In particular, we have generated a carboxy-terminal Sequential Peptide Affinity (SPA) dual tagging system for affinity-purifying native protein complexes from cultured gram-negative Escherichia coli, using genetically-tractable host laboratory strains that are well-suited for genome-wide investigations of the fundamental biology and conserved processes of prokaryotes1, 2, 7. Our SPA-tagging system is analogous to the tandem affinity purification method developed originally for yeast8, 9, and consists of a calmodulin binding peptide (CBP) followed by the cleavage site for the highly specific tobacco etch virus (TEV) protease and three copies of the FLAG epitope (3X FLAG), allowing for two consecutive rounds of affinity enrichment. After cassette amplification, sequence-specific linear PCR products encoding the SPA-tag and a selectable marker are integrated and expressed in frame as carboxy-terminal fusions in a DY330 background that is induced to transiently express a highly efficient heterologous bacteriophage lambda recombination system10. Subsequent dual-step purification using calmodulin and anti-FLAG affinity beads enables the highly selective and efficient recovery of even low abundance protein complexes from large-scale cultures. Tandem mass spectrometry is then used to identify the stably co-purifying proteins with high sensitivity (low nanogram detection limits).
Here, we describe detailed step-by-step procedures we commonly use for systematic protein tagging, purification and mass spectrometry-based analysis of soluble protein complexes from E. coli, which can be scaled up and potentially tailored to other bacterial species, including certain opportunistic pathogens that are amenable to recombineering. The resulting physical interactions can often reveal interesting unexpected components and connections suggesting novel mechanistic links. Integration of the PPI data with alternate molecular association data such as genetic (gene-gene) interactions and genomic-context (GC) predictions can facilitate elucidation of the global molecular organization of multi-protein complexes within biological pathways. The networks generated for E. coli can be used to gain insight into the functional architecture of orthologous gene products in other microbes for which functional annotations are currently lacking.

Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry

Affinity purification of tagged proteins in combination with mass spectrometry (APMS) is a powerful method for the systematic mapping of protein interaction networks and for investigating the mechanistic basis of biological processes. Here, we describe an optimized sequential peptide affinity (SPA) APMS procedure developed for the bacterium Escherichia coli that can be used to isolate and characterize stable multi-protein complexes to near homogeneity even starting from low copy numbers per cell.

تحديد بروتين في مجمعات<em&gt; كولاي</em&gt; استخدام المتعاقبة تنقية تقارب الببتيد في تركيبة مع جنبا إلى جنب الطيف الكتلي

Since most cellular processes are mediated by macromolecular assemblies, the systematic identification of protein-protein interactions (PPI) and the ...

Identification of Post-translational Modifications of Plant Protein Complexes

Plants adapt quickly to changing environments due to elaborate perception and signaling systems. During pathogen attack, plants rapidly respond to infection via the recruitment and activation of immune complexes. Activation of immune complexes is associated with post-translational modifications (PTMs) of proteins, such as phosphorylation, glycosylation, or ubiquitination. Understanding how these PTMs are choreographed will lead to a better understanding of how resistance is achieved.
Here we describe a protein purification method for nucleotide-binding leucine-rich repeat (NB-LRR)-interacting proteins and the subsequent identification of their post-translational modifications (PTMs). With small modifications, the protocol can be applied for the purification of other plant protein complexes. The method is based on the expression of an epitope-tagged version of the protein of interest, which is subsequently partially purified by immunoprecipitation and subjected to mass spectrometry for identification of interacting proteins and PTMs.
This protocol demonstrates that: i). Dynamic changes in PTMs such as phosphorylation can be detected by mass spectrometry; ii). It is important to have sufficient quantities of the protein of interest, and this can compensate for the lack of purity of the immunoprecipitate; iii). In order to detect PTMs of a protein of interest, this protein has to be immunoprecipitated to get a sufficient quantity of protein.

We describe here a protocol for the purification and characterization of plant protein complexes. We demonstrate that by immunoprecipitating a single protein within a complex, so we can identify its post-translational modifications and its interacting partners.

تحديد التعديلات بعد متعدية من النباتات بروتين المجمعات

Plants adapt quickly to changing environments due to elaborate perception and signaling systems. During pathogen attack, plants rapidly respond to ...

Isolation of Blood-vessel-derived Multipotent Precursors from Human Skeletal Muscle

Since the discovery of mesenchymal stem/stromal cells (MSCs), the native identity and localization&#160;of MSCs have been obscured by their retrospective isolation in culture. Recently, using fluorescence-activated cell sorting (FACS), we and other researchers prospectively identified and purified three subpopulations of multipotent precursor cells associated with the vasculature of human skeletal muscle. These three cell populations: myogenic endothelial cells (MECs), pericytes (PCs), and adventitial cells (ACs), are localized respectively to the three structural layers of blood vessels: intima, media, and adventitia. All of these human blood-vessel-derived stem cell (hBVSC) populations not only express classic MSC markers but also possess mesodermal developmental potentials similar to typical MSCs. Previously, MECs, PCs, and ACs have been isolated through distinct protocols and subsequently characterized in separate studies. The current isolation protocol, through modifications to the isolation process and adjustments in the selective cell surface markers, allows us to simultaneously purify all three hBVSC subpopulations by FACS from a single human muscle biopsy. This new method will not only streamline the isolation of multiple BVSC subpopulations but also facilitate future clinical applications of hBVSCs for distinct therapeutic purposes.

Blood vessels within human skeletal muscle harbor several multi-lineage precursor populations that are ideal for regenerative applications. This isolation method allows simultaneous purification of three multipotent precursor cell populations respectively from three structural layers of blood vessels: myogenic endothelial cells from intima, pericytes from media, and adventitial cells from adventitia.

العزلة من الدم والأوعية المشتقة متعددة القدرات السلائف من العضلات الهيكلية البشرية

Since the discovery of mesenchymal stem/stromal cells (MSCs), the native identity and localization&#160;of MSCs have been obscured by their retrospective ...

Studying the Protein Quality Control System of D. discoideum Using Temperature-controlled Live Cell Imaging

The complex lifestyle of the social amoebae Dictyostelium discoideum makes it a valuable model for the study of various biological processes. Recently, we showed that D. discoideum is remarkably resilient to protein aggregation and can be used to gain insights into the cellular protein quality control system. However, the use of D. discoideum as a model system poses several challenges to microscopy-based experimental approaches, such as the high motility of the cells and their susceptibility to photo-toxicity. The latter proves to be especially challenging when studying protein homeostasis, as the phototoxic effects can induce a cellular stress response and thus alter to behavior of the protein quality control system. 
Temperature increase is a commonly used way to induce cellular stress. Here, we describe a temperature-controllable imaging protocol, which allows observing temperature-induced perturbations in D. discoideum. Moreover, when applied at normal growth temperature, this imaging protocol can also noticeably reduce photo-toxicity, thus allowing imaging with higher intensities. This can be particularly useful when imaging proteins with very low expression levels. Moreover, the high mobility of the cells often requires the acquisition of multiple fields of view to follow individual cells, and the number of fields needs to be balanced against the desired time interval and exposure time.

Studying the Protein Quality Control System of D. discoideum Using Temperature-controlled Live Cell Imaging

The social amoebae Dictyostelium discoideum has recently been established as a system to study protein misfolding and proteostasis. Here, we describe a new imaging-based methodology to study temperature-induced protein aggregation and the cellular stress response in D. discoideum.

دراسة نظام لمراقبة الجودة من البروتين<em&gt; D. discoideum</em&gt; عن طريق درجة الحرارة التي تسيطر التصوير الخلية الحية

The complex lifestyle of the social amoebae Dictyostelium discoideum makes it a valuable model for the study of various biological processes. Recently, we ...