能够安东尼托马斯的技术援助表示感谢。

处理尿液样本的程序<ol><li>在37℃水浴解冻的尿液样本。到一个新的容器中倒出，如果原来是大打折扣。 </li><li>一个最高分装13毫升样品，并储存在-20 ° C，在标示的锥形离心管。 </li><li>测量和记录样品的光密度将尿液滴在折射仪夫妇。 </li><li>通过0.2微米的过滤器过滤的样品。 </li><li>根据光密度测量出下面的样本量<table border="0"><tbody><tr><td> 1.000-1.009 </td><td> 1.00毫升</td></tr><tr><td> 1.010-1.019 </td><td> 0.50毫升</td></tr><tr><td> 1.020-1.050 </td><td> 0.25毫升+ 0.25毫升H 2 O </td></tr></tbody></table></li><li>指定的卷，然后转移到一个Reactivial包含以下的内部标准：500纳摩尔（nmoles）3肌酸; 10 nmoles D 3甲基丙二酸; 100以下13 个 C 3乳酸nmoles，13 C 3丙酮酸，13 C 2 15 ñ甘氨酸，D 3，D 5苯丙氨酸丝氨酸，D 11 hexanoylglycine，15 N 2 orotate，D 4癸二酸，13 C 6葡萄糖肌醇和D，D 6 5色氨酸。 </li><li> 20微升（μL）7.5单位/μL的尿素溶液（Calzyme实验室目录。116A0100）被添加到的样品，然后刷新下的CO 2通过惰性隔密封。 </li><li>样本是在37℃30分钟，更多的二氧化碳气体，在15分钟的时间间隔有保有压。 </li><li>添加脲酶溶液20μL，小瓶二氧化碳刷新，和样品保持在37 ° C 15分钟。 </li><li> 500μL30:70丙酮：甲醇添加，更换的橡胶隔膜与聚四氟乙烯涂层隔，样品在-20℃冷冻15分钟。 </li><li>固体去除离心1500转× 10分钟，然后放入干净的2.0 CC Reactivial（Supelco公司/适马）转自</li><li>添加如下三乙的三氟乙酸（茶/ TFA），（Sigma公司）： <ul><li>为1.00毫升的样品20μL </li><li> 40μL0.5毫升，或更少，样品</li></ul></li><li>顶部用乙腈和地点下氮气流在70 ° C，直到实现定容（茶/ TFA仍将）（〜15分钟）。 </li><li>重复第13步，直到沉淀形式（〜10分钟）高达4倍。 </li><li>约2分钟，放凉。顶过二氯甲烷，小心煮沸过，干（〜4:00分钟）。 </li><li>重复步骤15。 </li><li> MSTFA（N -甲基- N - trimethylsilyltrifluoroacetamide）（热科学）添加下列税率： <ul><li>为1.00毫升的样品150μL </li><li> 0.50毫升，或更少，样品200μL </li></ul></li><li>下氮气气氛和孵化的第70 ° C为1小时。 </li><li>转移到microvials，在氮气气氛下，气相色谱/质谱仪分析。 </li><li>自动注射由安捷伦5975气相色谱/质谱广场microvials：仪器温度：喷油器200 ° C，接口250℃，烤箱80 ° C为1分钟;坡道在4 ° C /分钟80-130 ° C，坡道6 °彗星/分钟130-200 ° C，坡道为12 ° C /分钟200-285 ° C，保持10分钟。列：25米，320微米，0.5微米的薄膜厚度为DB - 5编号。质谱：源230℃，四150℃，2.46次/秒的扫描50-650阿木。溶剂延迟3.5分钟。 </li></ol>代表性的成果请<a href="http://www.jove.com/files/ftp_upload/2014/ShoemakerResultHawkinsinuria.pdf">点击这里</a>看到代表结果。

<ol>
	<li>Shoemaker, J. D., Elliott, W. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Automated+screening+of+urine+samples+for+carbohydrates,+organic+and+amino+acids+after+treatment+with+urease.">Automated screening of urine samples for carbohydrates, organic and amino acids after treatment with urease.</a> J. Chromatogr. 562 (1-2), 125-138 (1991).</li><li>Kuhara, T., Shinka, T., Inoue, Y., Ohse, M., Zhen-wei, X., Yoshida, I., Inokuchi, T., Yamaguchi, S., Takayanagi, M., Matsumoto, I. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pilot+study+of+gas+chromatographic-mass+spectrometric+screening+of+newborn+urine+for+inborn+errors+of+metabolism+after+treatment+with+urease.">Pilot study of gas chromatographic-mass spectrometric screening of newborn urine for inborn errors of metabolism after treatment with urease.</a> J Chromatogr B Biomed Sci Appl. 731 (1), 141-147 (1999).</li><li>Fu, X., Iga, M., Kimura, M., Yamaguchi, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simplified+screening+for+organic+acidemia+using+GC/MS+and+dried+urine+filter+paper:+a+study+on+neonatal+mass+screening.">Simplified screening for organic acidemia using GC/MS and dried urine filter paper: a study on neonatal mass screening.</a> Early Hum Dev. 58 (1), 41-55 (2000).</li><li>Kuhara, T., Ohdoi, C., Ohse, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Simple+gas+chromatographic-mass+spectrometric+procedure+for+diagnosing+pyrimidine+degradation+defects+for+prevention+of+severe+anticancer+side+effects.">Simple gas chromatographic-mass spectrometric procedure for diagnosing pyrimidine degradation defects for prevention of severe anticancer side effects.</a> J Chromatogr B Biomed Sci Appl. 758 (1), 61-74 (2001).</li><li>Kuhara, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Diagnosis+of+inborn+errors+of+metabolism+using+filter+paper+urine,+urease+treatment,+isotope+dilution+and+gas+chromatography-mass+spectrometry.">Diagnosis of inborn errors of metabolism using filter paper urine, urease treatment, isotope dilution and gas chromatography-mass spectrometry.</a> J Chromatogr B Biomed Sci Appl. 758, 3-25 (2001).</li><li>Iga, M., Kimura, M., Ohura, T., Kikawa, Y., Yamaguchi, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid,+simplified+and+sensitive+method+for+screening+fructose-1,6-diphosphatase+deficiency+by+analyzing+urinary+metabolites+in+urease/direct+preparations+and+gas+chromatography-mass+spectrometry+in+the+selected-ion+monitoring+mode.">Rapid, simplified and sensitive method for screening fructose-1,6-diphosphatase deficiency by analyzing urinary metabolites in urease/direct preparations and gas chromatography-mass spectrometry in the selected-ion monitoring mode.</a> J Chromatogr B Biomed Sci Appl. 746 (1), 75-82 (2000).</li><li>Kuhara, T., Ohse, M., Ohdoi, C., Ishida, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differential+diagnosis+of+homocystinuria+by+urease+treatment,+isotope+dilution+and+gas+chromatography-mass+spectrometry.">Differential diagnosis of homocystinuria by urease treatment, isotope dilution and gas chromatography-mass spectrometry.</a> J Chromatogr B Biomed Sci Appl. 742 (1), 59-70 (2000).</li><li>Young, V., Lo, S., Shoemaker, J., Thomas, A., Rhead, W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Validation+and+Extension+of+the+Urease+Method+for+Urine+Organic+and+Amino+Acid+Analysis.">Validation and Extension of the Urease Method for Urine Organic and Amino Acid Analysis.</a> , (2008).</li><li>Smith, E. M., Hoi, J. T., Eissenberg, J. C., Shoemaker, J. D., Neckameyer, W. S., Ilvarsonn, A. M., Harshman, L. G., Schlegel, V. L., Zempleni, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Feeding+Drosophila+a+biotin-deficient+diet+for+multiple+generations+increases+stress+resistance+and+lifespan+and+alters+gene+expression+and+histone+biotinylation+patterns.">Feeding Drosophila a biotin-deficient diet for multiple generations increases stress resistance and lifespan and alters gene expression and histone biotinylation patterns.</a> J Nutr. 137 (9), 2006-2012 (2007).</li><li>Brown, S. M., Shoemaker, J. D., Lodge, J. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Importance+of+NADP+-Dependent+Isocitrate+Dehydrogenase+in+Resistance+to+Nitrosative+Stress+and+the+Inessentiality+of+Glucose-6-Phosphate+Dehydrogenase+for+Oxidative+Stress+Resistance+in+Cryptococcus+neoformans.">The Importance of NADP+-Dependent Isocitrate Dehydrogenase in Resistance to Nitrosative Stress and the Inessentiality of Glucose-6-Phosphate Dehydrogenase for Oxidative Stress Resistance in Cryptococcus neoformans.</a> Eukaryotic Cell. , (2010).</li><li>Shoemaker, 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=Nutritional+Screening+in+Humans+by+Gas+Chromatography-Mass+Spectrometry+of+Urine+Metabolites+After+Substrate+Loading.">Nutritional Screening in Humans by Gas Chromatography-Mass Spectrometry of Urine Metabolites After Substrate Loading.</a> , (1992).</li><li>Baggot, P. J., Kalamarides, J. A., Shoemaker, 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=Valproate-induced+biochemical+abnormalities+in+pregnancy+corrected+by+vitamins:+A+Case+Report.">Valproate-induced biochemical abnormalities in pregnancy corrected by vitamins: A Case Report.</a> Epilepsia. 40 (44), 512-515 (1999).</li><li>Baggot, P. J., Eliseo, A. J., Kalamarides, J. A., Shoemaker, 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=A+folate-dependent+metabolite+in+amniotic+fluid+from+pregnancies+with+normal+or+trisomy+21+chromosomes.">A folate-dependent metabolite in amniotic fluid from pregnancies with normal or trisomy 21 chromosomes.</a> Fetal Diagn Ther. 21 (1), 148-152 (2006).</li><li>Baggot, P. J., Eliseo, A. J., DeNicola, N. G., Kalamarides, J. A., Shoemaker, 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=Organic+acid+concentrations+in+amniotic+fluid+found+in+normal+and+Down+syndrome+pregnancies.">Organic acid concentrations in amniotic fluid found in normal and Down syndrome pregnancies.</a> Fetal Diagn Ther. 23 (3), 245-248 (2008).</li><li>Baggot, P. J., Eliseo, A. J., DeNicola, N. G., Kalamarides, J. A., Shoemaker, 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=Pyridoxine-related+metabolite+concentrations+in+normal+and+Down+syndrome+amniotic+fluid.">Pyridoxine-related metabolite concentrations in normal and Down syndrome amniotic fluid.</a> Fetal Diagn Ther. 23 (4), 254-257 (2008).</li></ol>

代谢筛查实验室是美国圣路易斯大学，一个非营利性的公司所拥有的CLIA执照的临床实验室。博士苏梅克不直接从实验室收入的利润，但可能会间接受益于实验室生产力。没有方法，技巧，结果，正常范围内，宏，软件，图书馆或结论被认为是专有和免费提供给有兴趣的人士。

尿素酶方法（1）已被引用62次在各种修改的医学文献。松本组（2,3）简化程序，为高通量的新生儿疾病筛查和报告16000例患者的结果。 Kuhara和其他人（4-7）报道与生俱来的错误诊断的几起案件中使用的方法和后续。 Rhead（8）也证实，为临床诊断方法的实用性和后续与生俱来的错误。该方法已应用于熊尿，基因敲除小鼠，大象和整个果蝇和它们的幼虫（9）匀浆。 隐球菌定点突变前后的文化媒体也分析，没有脲（10步） 。该方法已应用到人类的营养评估医学生唐氏综合征患者和老人痴呆症患者的退伍军人，加载后口服剂量的氨基酸色氨酸，蛋氨酸和异亮氨酸（11）科目。所有八个B族维生素评估量化的三个氨基酸，其中，要求在一些点在其降解所有8维生素的分解产物。补充维生素药品和缓解的毒副作用已经报道（12）。从正常和唐氏综合症妊娠的羊水样本进行了分析和报道（13-15）。

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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">	
		
		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>MSD 5975</td>
<td>&nbsp;</td>
<td>Agilent</td>
<td>&nbsp;</td>
<td>GC/MS/Computer</td>
</tr>
<tr>
<td>MSD 5973</td>
<td>&nbsp;</td>
<td>Agilent</td>
<td>&nbsp;</td>
<td>GC/MS/Computer</td>
</tr>
<tr>
<td>Urease</td>
<td>&nbsp;</td>
<td>Calzyme</td>
<td>116A0100</td>
<td>Also Sigma C3</td>
</tr>
<tr>
<td>Stable Isotope Standards</td>
<td>&nbsp;</td>
<td>CDN Isotopes, Isotec, Cambridge Isotope Lab</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Solvents</td>
<td>&nbsp;</td>
<td>Fisher</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Analytes</td>
<td>&nbsp;</td>
<td>Sigma, Universidad Autonoma de Madrid, Ernesto Brunet</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>GC Columns</td>
<td>&nbsp;</td>
<td>J&amp;W Scientific</td>
<td>123-5026</td>
<td>&nbsp;</td>
<tr>
<td>TEA/TFA</td>
<td>&nbsp;</td>
<td>Fluka/Sigma</td>
<td>09747</td>
<td>&nbsp;</td>
<tr>
<td>Vials</td>
<td>&nbsp;</td>
<td>Supelco/Sigma</td>
<td>Z115088/12EA</td>
<td>&nbsp;</td>
<tr>
<td>Merlin Microseal</td>
<td>&nbsp;</td>
<td>Agilent</td>
<td>5181-8815</td>
<td>&nbsp;</td>
<tr>
<td>MSTFA</td>
<td>&nbsp;</td>
<td>Thermal Scientific</td>
<td>48913</td>
<td>&nbsp;</td>		</tbody>
		</table>
		</div>

one-step metabolomics: carbohydrates, organic and amino acids quantified in a single procedure

在美国出生的每个婴儿现在筛选长达42罕见遗传性疾病，称为“先天代谢的错误”。基于串联质谱筛查方法和量化有机酸血症的屏幕acylcarnitines还措施氨基酸。所有国家也进行了测试碳水化合物的疾病，如半乳糖的酶。非特异性，后续检测的阳性结果，因为结果可以是使用一个更明确的方法的要求。本报告介绍了“脲”与生俱来的错误检查的样品制备方法。结晶脲酶是用来清除体液中的尿素，允许其他大多数水溶性代谢产物的气相色谱在一个单一的过程中脱水和衍生。在氮气流中蒸发脱水的便利，加入乙腈和二氯甲烷。然后，三甲基硅烷在一个独特的催化剂，三乙基三氟存在。其次是宏观驱动192的代谢物和半定量使用专门的TMS衍生物的生物化合物的质谱库的每一个主要组件的自定义量化的自动注入和色谱。分析可能是执行上广泛使用的化学工作站平台，采用从作者提供的宏和库。在我们的实验室，超过16,000名患者的样本进行了分析，使用了约17％的诊断率的方法 - 也就是说，17％的样品结果显示订货医生应该采取行动后的结果。 ，其中包括超过180确认与生俱来的错误，其中约38％不能使用前面的方法诊断。

Watch this Scientific Journal Video about One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure at JoVE.com

One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure

脲中介代谢物的GC / MS分析的样品制备方法是由它的发明者。该方法允许单步跟进串联质谱新生儿筛查先天的错误量化碳水化合物，有机和氨基酸都在一个单一的过程。

一步代谢：碳水化合物，在一个单一的过程量化的有机和氨基酸

Every infant born in the US is now screened for up to 42 rare genetic disorders called "inborn errors of metabolism". The screening method is based on ...

one-step-metabolomics-carbohydrates-organic-amino-acids-quantified

Research

JoVE Journal

Biology

13.0K 次观看.  Saint Louis University School of Medicine. 脲中介代谢物的GC / MS分析的样品制备方法是由它的发明者。该方法允许单步跟进串联质谱新生儿筛查先天的错误量化碳水化合物，有机和氨基酸都在一个单一的过程。

视频: One-step Metabolomics: Carbohydrates, Organic and Amino Acids Quantified in a Single Procedure

Murine Renal Transplantation Procedure

Renal orthotopic transplantation in mice is a technically challenging procedure. Although the first kidney transplants in mice were performed by Russell et al over 30 years ago (1) and refined by Zhang et al years later (2), few people in the world have mastered this procedure. In our laboratory we have successfully performed 1200 orthotopic kidney transplantations with &gt; 90% survival rate. The key points for success include stringent control of reperfusion injury, bleeding and thrombosis, both during the procedure and post-transplantation, and use of 10-0 instead of 11-0 suture for anastomoses.
Post-operative care and treatment of the recipient is extremely important to transplant success and evaluation. All renal graft recipients receive antibiotics in the form of an injection of penicillin immediately post-transplant and sulfatrim in the drinking water continually. Overall animal health is evaluated daily and whole blood creatinine analyses are performed routinely with a portable I-STAT machine to assess graft function.

Renal transplantation in mice is a technically challenging procedure that requires careful post-operative care and treatment for success.

小鼠肾移植程序

Renal orthotopic transplantation in mice is a technically challenging procedure. Although the first kidney transplants in mice were performed by Russell ...

科研

生物学

Mammary Epithelial Transplant Procedure

This article describes and compares the fat pad clearance procedure developed by DeOme KB et al.1 and the sparing procedure developed by Brill B et al.2, followed by the mammary epithelial transplant procedure. The mammary transplant procedure is widely used by mammary biologists because it takes advantage of the fact that significant development of the mammary epithelium doesn't occur until after puberty. At 3 weeks of age, growth of the mammary epithelial tree is confined to the vicinity of the nipple and the fat pad is largely devoid of mammary epithelium, but by 7 weeks of age the epithelial ductal tree extends throughout the entire fat pad. Therefore, if this small portion of the fat pad containing epithelium, the region between the nipple and the lymph node, is removed at 3 weeks of age, the endogenous epithelium will never populate the mammary fat pad and the fat pad is described as "cleared". At this time, mammary epithelium from another source can be transplanted in the cleared fat pad where it has the potential to extend mammary ductal trees through out the fat pad. This procedure has been utilized in many experimental models including the examination of tumor phenotype in transgenic mammary epithelial tissue without the confounding effects of genotype on the entire animal3, in the identification of mammary stem cells by transplanting cells in limited dilution4,5, determining if hyperplastic nodules proceed to mammary tumors6, and to assess the effect of prior hormone exposure on the behavior of the mammary epithelium7,8.
Three week old host mice are anesthetized, cleaned and restrained on a surgical stage. A mid-sagittal incision is made through the skin, but not the peritoneum, extending from the pubis to the sternum. Oblique cuts are made through the skin from the mid-sagittal incision across the pelvis toward each leg. The skin is pulled away from the peritoneum to expose the 4th inguinal mammary gland. The fat pad is cleared by removing the fat pad tissue anterior to the lymph node. Epithelium fragments or epithelial cells are transplanted into the remaining cleared fat pad and the mouse is closed.

This article demonstrates the procedure developed by DeOme KB et al. (1959) and the sparing procedure developed by Brill B et al. (2008) for clearing the 4th inguinal mammary fat pad of a pubescent mouse in preparation for transplantation of mammary fragments, mammary epithelial cells, or mammary tumor cells.

乳腺上皮移植手术

This article describes and compares the fat pad clearance procedure developed by DeOme KB et al.1 and the sparing procedure developed by Brill B et al.2, ...

Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids

Microbes have complex metabolic pathways that can be investigated using biochemistry and functional genomics methods. One important technique to examine cell central metabolism and discover new enzymes is 13C-assisted metabolism analysis 1. This technique is based on isotopic labeling, whereby microbes are fed with a 13C labeled substrates. By tracing the atom transition paths between metabolites in the biochemical network, we can determine functional pathways and discover new enzymes. 
As a complementary method to transcriptomics and proteomics, approaches for isotopomer-assisted analysis of metabolic pathways contain three major steps 2. First, we grow cells with 13C labeled substrates. In this step, the composition of the medium and the selection of labeled substrates are two key factors. To avoid measurement noises from non-labeled carbon in nutrient supplements, a minimal medium with a sole carbon source is required. Further, the choice of a labeled substrate is based on how effectively it will elucidate the pathway being analyzed. Because novel enzymes often involve different reaction stereochemistry or intermediate products, in general, singly labeled carbon substrates are more informative for detection of novel pathways than uniformly labeled ones for detection of novel pathways3, 4. Second, we analyze amino acid labeling patterns using GC-MS. Amino acids are abundant in protein and thus can be obtained from biomass hydrolysis. Amino acids can be derivatized by N-(tert-butyldimethylsilyl)-N-methyltrifluoroacetamide (TBDMS) before GC separation. TBDMS derivatized amino acids can be fragmented by MS and result in different arrays of fragments. Based on the mass to charge (m/z) ratio of fragmented and unfragmented amino acids, we can deduce the possible labeled patterns of the central metabolites that are precursors of the amino acids. Third, we trace 13C carbon transitions in the proposed pathways and, based on the isotopomer data, confirm whether these pathways are active 2. Measurement of amino acids provides isotopic labeling information about eight crucial precursor metabolites in the central metabolism. These metabolic key nodes can reflect the functions of associated central pathways.
13C-assisted metabolism analysis via proteinogenic amino acids can be widely used for functional characterization of poorly-characterized microbial metabolism1. In this protocol, we will use Cyanothece 51142 as the model strain to demonstrate the use of labeled carbon substrates for discovering new enzymatic functions.

Metabolic Pathway Confirmation and Discovery Through 13C-labeling of Proteinogenic Amino Acids

13C-isotope labeling is a useful technique for determining the cell central metabolism for various types of microorganisms. After cells have been cultured with a specific labeled substrate, GC-MS measurement can reveal functional metabolic pathways based on unique labeling patterns in proteinogenic amino acids.

代谢途径的确认和发现通过 13 C - Proteinogenic氨基酸的标签

Microbes have complex metabolic pathways that can be investigated using biochemistry and functional genomics methods. One important technique to examine ...

Quantitative Measurement of Invadopodia-mediated Extracellular Matrix Proteolysis in Single and Multicellular Contexts

Cellular invasion into local tissues is a process important in development and homeostasis. Malregulated invasion and subsequent cell movement is characteristic of multiple pathological processes, including inflammation, cardiovascular disease and tumor cell metastasis1. Focalized proteolytic degradation of extracellular matrix (ECM) components in the epithelial or endothelial basement membrane is a critical step in initiating cellular invasion. In tumor cells, extensive in vitro analysis has determined that ECM degradation is accomplished by ventral actin-rich membrane protrusive structures termed invadopodia2,3. Invadopodia form in close apposition to the ECM, where they moderate ECM breakdown through the action of matrix metalloproteinases (MMPs). The ability of tumor cells to form invadopodia directly correlates with the ability to invade into local stroma and associated vascular components3. 
Visualization of invadopodia-mediated ECM degradation of cells by fluorescent microscopy using dye-labeled matrix proteins coated onto glass coverslips has emerged as the most prevalent technique for evaluating the degree of matrix proteolysis and cellular invasive potential4,5. Here we describe a version of the standard method for generating fluorescently-labeled glass coverslips utilizing a commercially available Oregon Green-488 gelatin conjugate. This method is easily scaled to rapidly produce large numbers of coated coverslips. We show some of the common microscopic artifacts that are often encountered during this procedure and how these can be avoided. Finally, we describe standardized methods using readily available computer software to allow quantification of labeled gelatin matrix degradation mediated by individual cells and by entire cellular populations. The described procedures provide the ability to accurately and reproducibly monitor invadopodia activity, and can also serve as a platform for evaluating the efficacy of modulating protein expression or testing of anti-invasive compounds on extracellular matrix degradation in single and multicellular settings.

We describe the prototypical method for producing microscope coverslips coated with fluorescent gelatin for visualizing invadopodia-mediated matrix degradation. Computational techniques using available software are presented for quantifying the resultant levels of matrix proteolysis by single cells within a mixed population and for multicellular groups encompassing entire microscopic fields.

定量测量的侵袭伪足介导的细胞外基质蛋白水解单和多细胞的情况下

Cellular invasion into local tissues is a process important in development and homeostasis.  Malregulated invasion and subsequent cell movement is ...

A Chemical Screening Procedure for Glucocorticoid Signaling with a Zebrafish Larva Luciferase Reporter System

Glucocorticoid stress hormones and their artificial derivatives are widely used drugs to treat inflammation, but long-term treatment with glucocorticoids can lead to severe side effects. Test systems are needed to search for novel compounds influencing glucocorticoid signaling in vivo or to determine unwanted effects of compounds on the glucocorticoid signaling pathway. We have established a transgenic zebrafish assay which allows the measurement of glucocorticoid signaling activity in vivo and in real-time, the GRIZLY assay (Glucocorticoid Responsive In vivo Zebrafish Luciferase activitY). The luciferase-based assay detects effects on glucocorticoid signaling with high sensitivity and specificity, including effects by compounds that require metabolization or affect endogenous glucocorticoid production. We present here a detailed protocol for conducting chemical screens with this assay. We describe data acquisition, normalization, and analysis, placing a focus on quality control and data visualization. The assay provides a simple, time-resolved, and quantitative readout. It can be operated as a stand-alone platform, but is also easily integrated into high-throughput screening workflows. It furthermore allows for many applications beyond chemical screening, such as environmental monitoring of endocrine disruptors or stress research.

We describe the procedure and data analysis of a chemical screening system for glucocorticoid stress hormone signaling using zebrafish larvae: the Glucocorticoid Responsive In vivo Zebrafish Luciferase activitY (GRIZLY) assay. The assay sensitively and specifically detects effects on glucocorticoid signaling by compounds that require metabolization or affect endogenous glucocorticoid production.

对糖皮质激素信号A化学筛选程序与斑马鱼幼虫的荧光素酶报告系统

Glucocorticoid stress hormones and their artificial derivatives are widely used drugs to treat inflammation, but long-term treatment with glucocorticoids ...

A Strategy for Sensitive, Large Scale Quantitative Metabolomics

Metabolite profiling has been a valuable asset in the study of metabolism in health and disease. However, current platforms have different limiting factors, such as labor intensive sample preparations, low detection limits, slow scan speeds, intensive method optimization for each metabolite, and the inability to measure both positively and negatively charged ions in single experiments. Therefore, a novel metabolomics protocol could advance metabolomics studies. Amide-based hydrophilic chromatography enables polar metabolite analysis without any chemical derivatization. High resolution MS using the Q-Exactive (QE-MS) has improved ion optics, increased scan speeds (256 msec at resolution 70,000), and has the capability of carrying out positive/negative switching. Using a cold methanol extraction strategy, and coupling an amide column with QE-MS enables robust detection of 168 targeted polar metabolites and thousands of additional features simultaneously.&#160; Data processing is carried out with commercially available software in a highly efficient way, and unknown features extracted from the mass spectra can be queried in databases.

Metabolite profiling has been a valuable asset in the study of metabolism in health and disease. Utilizing normal-phased liquid chromatography coupled to high-resolution mass spectrometry with polarity switching and a rapid duty cycle, we describe a protocol to analyze the polar metabolic composition of biological material with high sensitivity, accuracy, and resolution.

敏感，大规模定量代谢组学的策略

Metabolite profiling has been a valuable asset in the study of metabolism in health and disease. However, current platforms have different limiting ...

One-step Purification of Twin-Strep-tagged Proteins and Their Complexes on Strep-Tactin Resin Cross-linked With Bis(sulfosuccinimidyl) Suberate (BS3)

Affinity purification of Strep-tagged fusion proteins on resins carrying an engineered streptavidin (Strep-Tactin) has become a widely used method for isolation of protein complexes under physiological conditions. Fusion proteins containing two copies of Strep-tag II, designated twin-Strep-tag or SIII-tag, have the advantage of higher affinity for Strep-Tactin compared to those containing only a single Strep-tag, thus allowing more efficient protein purification. However, this advantage is offset by the fact that elution of twin-Strep-tagged proteins with biotin may be incomplete, leading to low protein recovery. The recovery can be dramatically improved by using denaturing elution with sodium dodecyl sulfate (SDS), but this leads to sample contamination with Strep-Tactin released from the resin, making the assay incompatible with downstream proteomic analysis. To overcome this limitation, we have developed a method whereby resin-coupled tetramer of Strep-Tactin is first stabilized by covalent cross-linking with Bis(sulfosuccinimidyl) suberate (BS3) and the resulting cross-linked resin is then used to purify target protein complexes in a single batch purification step. Efficient elution with SDS ensures good protein recovery, while the absence of contaminating Strep-Tactin allows downstream protein analysis by mass spectrometry. As a proof of concept, we describe here a protocol for purification of SIII-tagged viral protein VPg-Pro from nuclei of virus-infected N. benthamiana plants using the Strep-Tactin polymethacrylate resin cross-linked with BS3. The same protocol can be used to purify any twin-Strep-tagged protein of interest and characterize its physiological binding partners.

One-step Purification of Twin-Strep-tagged Proteins and Their Complexes on Strep-Tactin Resin Cross-linked With Bissulfosuccinimidyl Suberate BS3

A method is described for efficient purification of twin-Strep-tagged fusion proteins and their specific complexes on modified streptavidin (Strep-Tactin) resin covalently cross-linked with Bis(sulfosuccinimidyl) suberate (BS3). The method has the advantages of fast speed, good target protein recovery and high purity, and is compatible with subsequent analysis by mass spectrometry.

对链球菌-Tactin树脂交联的双（磺基）辛二酸酯（BS3）双链球菌标记蛋白及其复合物的一步纯化

Affinity purification of Strep-tagged fusion proteins on resins carrying an engineered streptavidin (Strep-Tactin) has become a widely used method for ...

Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues

S-Adenosyl-l-methionine (AdoMet or SAM)-dependent methyltransferases (MTase) catalyze the transfer of the activated methyl group from AdoMet to specific positions in DNA, RNA, proteins and small biomolecules. This natural methylation reaction can be expanded to a wide variety of alkylation reactions using synthetic cofactor analogues. Replacement of the reactive sulfonium center of AdoMet with an aziridine ring leads to cofactors which can be coupled with DNA by various DNA MTases. These aziridine cofactors can be equipped with reporter groups at different positions of the adenine moiety and used for Sequence-specific Methyltransferase-Induced Labeling of DNA (SMILing DNA). As a typical example we give a protocol for biotinylation of pBR322 plasmid DNA at the 5&#8217;-ATCGAT-3&#8217; sequence with the DNA MTase M.BseCI and the aziridine cofactor 6BAz in one step. Extension of the activated methyl group with unsaturated alkyl groups results in another class of AdoMet analogues which are used for methyltransferase-directed Transfer of Activated Groups (mTAG). Since the extended side chains are activated by the sulfonium center and the unsaturated bond, these cofactors are called double-activated AdoMet analogues. These analogues not only function as cofactors for DNA MTases, like the aziridine cofactors, but also for RNA, protein and small molecule MTases. They are typically used for enzymatic modification of MTase substrates with unique functional groups which are labeled with reporter groups in a second chemical step. This is exemplified in a protocol for fluorescence labeling of histone H3 protein. A small propargyl group is transferred from the cofactor analogue SeAdoYn to the protein by the histone H3 lysine 4 (H3K4) MTase Set7/9 followed by click labeling of the alkynylated histone H3 with TAMRA azide. MTase-mediated labeling with cofactor analogues is an enabling technology for many exciting applications including identification and functional study of MTase substrates as well as DNA genotyping and methylation detection.

DNA and proteins are sequence-specifically labeled with affinity or fluorescent reporter groups using DNA or protein methyltransferases and synthetic cofactor analogues. Depending on the cofactor specificity of the enzymes, aziridine or double activated cofactor analogues are employed for one- or two-step labeling.

核酸，蛋白质与甲基转移和辅酶类似物序列特异性标签

S-Adenosyl-l-methionine (AdoMet or SAM)-dependent methyltransferases (MTase) catalyze the transfer of the activated methyl group from AdoMet to specific ...

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System

The canonical set of amino acids leads to an exceptionally wide range of protein functionality. Nevertheless, the set of residues still imposes limitations on potential protein applications. The incorporation of noncanonical amino acids can enlarge this scope. There are two complementary approaches for the incorporation of noncanonical amino acids. For site-specific incorporation, in addition to the endogenous canonical translational machineries, an orthogonal aminoacyl-tRNA-synthetase-tRNA pair must be provided that does not interact with the canonical ones. Consequently, a codon that is not assigned to a canonical amino acid, usually a stop codon, is also required. This genetic code expansion enables the incorporation of a noncanonical amino acid at a single, given site within the protein. The here presented work describes residue-specific incorporation where the genetic code is reassigned within the endogenous translational system. The translation machinery accepts the noncanonical amino acid as a surrogate to incorporate it at canonically prescribed locations, i.e., all occurrences of a canonical amino acid in the protein are replaced by the noncanonical one. The incorporation of noncanonical amino acids can change the protein structure, causing considerably modified physical and chemical properties. Noncanonical amino acid analogs often act as cell growth inhibitors for expression hosts since they modify endogenous proteins, limiting in vivo protein production. In vivo incorporation of toxic noncanonical amino acids into proteins remains particularly challenging. Here, a cell-free approach for a complete replacement of L-arginine by the noncanonical amino acid L-canavanine is presented. It circumvents the inherent difficulties of in vivo expression. Additionally, a protocol to prepare target proteins for mass spectral analysis is included. It is shown that L-lysine can be replaced by L-hydroxy-lysine, albeit with lower efficiency. In principle, any noncanonical amino acid analog can be incorporated using the presented method as long as the endogenous in vitro translation system recognizes it.

Residue-specific Incorporation of Noncanonical Amino Acids into Model Proteins Using an Escherichia coli Cell-free Transcription-translation System

An easy-to-use, cell-free expression protocol for the residue-specific incorporation of noncanonical amino acid analogs into proteins, including downstream analysis, is presented for medical, pharmaceutic, structural and functional studies.

非经典氨基酸的具体残留纳入到模型蛋白质使用<em&gt;大肠杆菌</em&gt;无细胞转录翻译系统

The canonical set of amino acids leads to an exceptionally wide range of protein functionality. Nevertheless, the set of residues still imposes ...

Filtration Isolation of Nucleic Acids:  A Simple and Rapid DNA Extraction Method

FINA, filtration isolation of nucleic acids, is a novel extraction method which utilizes vertical filtration via a separation membrane and absorbent pad to extract cellular DNA from whole blood in less than 2 min. The blood specimen is treated with detergent, mixed briefly and applied by pipet to the separation membrane. The lysate wicks into the blotting pad due to capillary action, capturing the genomic DNA on the surface of the separation membrane. The extracted DNA is retained on the membrane during a simple wash step wherein PCR inhibitors are wicked into the absorbent blotting pad. The membrane containing the entrapped DNA is then added to the PCR reaction without further purification. This simple method does not require laboratory equipment and can be easily implemented with inexpensive laboratory supplies. Here we describe a protocol for highly sensitive detection and quantitation of HIV-1 proviral DNA from 100 &#181;l whole blood as a model for early infant diagnosis of HIV that could readily be adapted to other genetic targets.

We describe here a simple and rapid paper-based DNA extraction method of HIV proviral DNA from whole blood detected by quantitative PCR. This protocol can be extended for use in detecting other genetic markers or using alternative amplification methods.

核酸的分离过滤：一种简单快速的DNA提取方法

FINA, filtration isolation of nucleic acids, is a novel extraction method which utilizes vertical filtration via a separation membrane and absorbent pad ...