Name: high throughput screening of fungal endoglucanase activity in escherichia coli
Uploaded: 2011-08-13T15:00:00
Description: Watch this Scientific Journal Video about High Throughput Screening of Fungal Endoglucanase Activity in Escherichia coli at JoVE.com

इस काम गॉर्डन और बेट्टी मूर फाउंडेशन, द्वारा और / UNCF मर्क विज्ञान पहल द्वारा वित्त पोषित किया गया था.

1. स्क्रीनिंग थाली तैयारी <ol><li> 25g लेग विकास मध्यम, 15g अगर, और 1.5g Carboxymethyl सेलूलोज़ (सीएमसी) 1L आसुत जल सब्सट्रेट, और बाँझ आटोक्लेव जोड़ें. </li><li> Autoclaving के बाद, शांत करने के लिए और उचित एंटीबायोटिक दवाओं को जोड़ने के लिए ?...

<ol>
	<li>Atsumi, S., Hanai, T., Liao, J. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Non-fermentative+pathways+for+synthesis+of+branched-chain+higher+alcohols+as+biofuels.">Non-fermentative pathways for synthesis of branched-chain higher alcohols as biofuels.</a> Nature. 451, 86-89 (2008).</li><li>Wilson, D. B. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cellulases+and+biofuels.">Cellulases and biofuels.</a> Curr Opin Biotechnol. 20, 295-299 (2009).</li><li>Qin, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Engineering+endoglucanase+II+from+Trichoderma+reesei+to+improve+the+catalytic+efficiency+at+a+higher+pH+optimum.">Engineering endoglucanase II from Trichoderma reesei to improve the catalytic efficiency at a higher pH optimum.</a> J Biotechnol. 135, 190-195 (2008).</li><li>Nakazawa, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Directed+evolution+of+endoglucanase+III+(Cel12A)+from+Trichoderma+reesei.">Directed evolution of endoglucanase III (Cel12A) from Trichoderma reesei.</a> Appl Microbiol Biotechnol. 83, 649-657 (2009).</li><li>Heinzelman, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+family+of+thermostable+fungal+cellulases+created+by+structure-guided+recombination.">A family of thermostable fungal cellulases created by structure-guided recombination.</a> Proc Natl Acad Sci. 106, 5610-5615 (2009).</li><li>Heinzelman, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=SCHEMA+recombination+of+a+fungal+cellulase+uncovers+a+single+mutation+that+contributes+markedly+to+stability.">SCHEMA recombination of a fungal cellulase uncovers a single mutation that contributes markedly to stability.</a> J Biol Chem. 284, 26229-26233 (2009).</li><li>Lantz, S. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hypocrea+jecorina+CEL6A+protein+engineering.">Hypocrea jecorina CEL6A protein engineering.</a> Biotechnol Biofuels. 8, 3-20 (2010).</li><li>Mahadevan, 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=Site-directed+mutagenesis+and+CBM+engineering+of+Cel5A+(Thermotoga+maritima).">Site-directed mutagenesis and CBM engineering of Cel5A (Thermotoga maritima).</a> FEMS Microbiol Lett. 287, 205-211 (2008).</li><li>Nakazawa, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Characterization+of+the+catalytic+domains+of+Trichoderma+reesei+endoglucanase+I,+II,+and+III,+expressed+in+Escherichia+coli.">Characterization of the catalytic domains of Trichoderma reesei endoglucanase I, II, and III, expressed in Escherichia coli.</a> Appl Microbiol Biotechnol. 81, 681-689 (2008).</li><li>Wang, H., Jones, R. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Properties+of+the+Macrophomina+phaseolina+endoglucanase+(EGL+1)+gene+product+in+bacterial+and+yeast+expression+systems.">Properties of the Macrophomina phaseolina endoglucanase (EGL 1) gene product in bacterial and yeast expression systems.</a> Appl Biochem Biotechnol. 81, 153-160 (1999).</li><li>Howard, R. 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J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Use+of+Congo+red-polysaccharide+interactions+in+enumeration+and+characterization+of+cellulolytic+bacteria+from+the+bovine+rumen.">Use of Congo red-polysaccharide interactions in enumeration and characterization of cellulolytic bacteria from the bovine rumen.</a> Appl Env Microbiol. 43, 777-780 (1982).</li><li>Gilkes, N. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mode+of+action+and+substrate+specificities+of+cellulases+from+cloned+bacterial+genes.">Mode of action and substrate specificities of cellulases from cloned bacterial genes.</a> J Bio Chem. 259, 10455-10459 (1984).</li></ol>

प्रोटोकॉल यहाँ वर्णित न्यूनतम हेरफेर के साथ तेजी से और उच्च सक्रिय एंजाइमों के throughput पहचान सक्षम बनाता है. गतिविधि का पता लगाने काफी संवेदनशील है, और गुणात्मक कक्ष के भीतर गतिविधि की राशि को दर्शाता है. ?...

<table border="1"><tbody><tr><th> अभिकर्मक </th><th> कंपनी </th><th> उत्पाद संख्या </th></tr><tr><td> IPTG </td><td> सिग्मा </td><td> I1284 </td></tr><tr><td> कांगो लाल </td><td> सिग्मा </td><td> C6277 </td></tr><tr><td> Carboxymethyl सेलूलोज़ </td><td> सिग्मा </td><td> 360384 </td></tr><tr><td> NaCl </td><td> सिग्मा </td><td> S1679 </td></tr><tr><td> Bacto - अगर </td><td> बी.डी. बायोसाइंसेज </td><td> 214030 </td></tr><tr><td> Bioassay प्लेटें </td><td> थर्मो वैज्ञानिक </td><td> 240845 </td></tr></tbody></table>

high throughput screening of fungal endoglucanase activity in escherichia coli

Cellulase enzymes (endoglucanases, cellobiohydrolases, and &beta;-glucosidases) hydrolyze cellulose into component sugars, which in turn can be converted into fuel alcohols1. The potential for enzymatic hydrolysis of cellulosic biomass to provide renewable energy has intensified efforts to engineer cellulases for economical fuel production2. Of particular interest are fungal cellulases3-8, which are already being used industrially for foods and textiles processing.
Identifying active variants among a library of mutant cellulases is critical to the engineering process; active mutants can be further tested for improved properties and/or subjected to additional mutagenesis. Efficient engineering of fungal cellulases has been hampered by a lack of genetic tools for native organisms and by difficulties in expressing the enzymes in heterologous hosts. Recently, Morikawa and coworkers developed a method for expressing in E. coli the catalytic domains of endoglucanases from H. jecorina3,9, an important industrial fungus with the capacity to secrete cellulases in large quantities. Functional E. coli expression has also been reported for cellulases from other fungi, including Macrophomina phaseolina10 and Phanerochaete chrysosporium11-12. 
We present a method for high throughput screening of fungal endoglucanase activity in E. coli. (Fig 1) This method uses the common microbial dye Congo Red (CR) to visualize enzymatic degradation of carboxymethyl cellulose (CMC) by cells growing on solid medium. The activity assay requires inexpensive reagents, minimal manipulation, and gives unambiguous results as zones of degradation (&#x201C;halos&#x201D;) at the colony site. Although a quantitative measure of enzymatic activity cannot be determined by this method, we have found that halo size correlates with total enzymatic activity in the cell. Further characterization of individual positive clones will determine , relative protein fitness. 
Traditional bacterial whole cell CMC/CR activity assays13 involve pouring agar containing CMC onto colonies, which is subject to cross-contamination, or incubating cultures in CMC agar wells, which is less amenable to large-scale experimentation. Here we report an improved protocol that modifies existing wash methods14 for cellulase activity: cells grown on CMC agar plates are removed prior to CR staining. Our protocol significantly reduces cross-contamination and is highly scalable, allowing the rapid screening of thousands of clones. In addition to H. jecorina enzymes, we have expressed and screened endoglucanase variants from the Thermoascus aurantiacus and Penicillium decumbens (shown in Figure 2), suggesting that this protocol is applicable to enzymes from a range of organisms.

Watch this Scientific Journal Video about High Throughput Screening of Fungal Endoglucanase Activity in Escherichia coli at JoVE.com

High Throughput Screening of Fungal Endoglucanase Activity in Escherichia coli

हम कवक endoglucanase में गतिविधि के लिए स्क्रीन के लिए एक कम लागत, उच्च throughput के विधि का वर्णन<em&gt; ई. कोलाई.</em&gt; विधि सब्सट्रेट गिरावट का एक साधारण दृश्य readout पर निर्भर करता है, एंजाइम शुद्धि की आवश्यकता नहीं है, और उच्च स्केलेबल है. यह एंजाइम वेरिएंट के बड़े पुस्तकालयों के तेजी से स्क्रीनिंग के लिए अनुमति देता है.

फफूंद Endoglucanase में गतिविधि का उच्च Throughput स्क्रीनिंग Escherichia कोलाई</em

Cellulase enzymes (endoglucanases, cellobiohydrolases, and &beta;-glucosidases) hydrolyze cellulose into component sugars, which in turn can be converted ...

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High Throughput Screening of Fungal Endoglucanase Activity in Escherichia coli

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में उत्पादित संयोजक Disulfide युक्त जहर प्रोटीन के लिए लागू उच्च Throughput मात्रात्मक अभिव्यक्ति स्क्रीनिंग और शोधन<em&gt; ई. कोली</em

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झिल्ली प्रोटीन की हरी फ्लोरोसेंट प्रोटीन आधारित अभिव्यक्ति स्क्रीनिंग में<em&gt; Escherichia कोलाई</em

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We report here that the expression of protein complexes in vivo in Escherichia coli can be more convenient than traditional reconstitution experiments in ...

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