1dym: Difference between revisions
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[[Image:1dym.gif|left|200px]]<br /><applet load="1dym" size=" | [[Image:1dym.gif|left|200px]]<br /><applet load="1dym" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1dym, resolution 1.75Å" /> | caption="1dym, resolution 1.75Å" /> | ||
'''HUMICOLA INSOLENS ENDOCELLULASE CEL7B (EG 1) E197A MUTANT ENDOGLUCANASE, HYDROLASE, CELLULASE, CELLULOSE DEGRADATION, GLYCOSIDE HYDROLASE FAMILY 7, GLYCOSYNTHASE'''<br /> | '''HUMICOLA INSOLENS ENDOCELLULASE CEL7B (EG 1) E197A MUTANT ENDOGLUCANASE, HYDROLASE, CELLULASE, CELLULOSE DEGRADATION, GLYCOSIDE HYDROLASE FAMILY 7, GLYCOSYNTHASE'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
1DYM is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Humicola_insolens Humicola insolens] with NAG as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Cellulase Cellulase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.4 3.2.1.4] Known structural/functional Site: <scene name='pdbsite=ACI:Catalytic Acid/Base Residue GLU 197 Is The Nucleophile ( ...'>ACI</scene>. Full crystallographic information is available from [http:// | 1DYM is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Humicola_insolens Humicola insolens] with <scene name='pdbligand=NAG:'>NAG</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/Cellulase Cellulase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.4 3.2.1.4] Known structural/functional Site: <scene name='pdbsite=ACI:Catalytic+Acid/Base+Residue+GLU+197+Is+The+Nucleophile+(+...'>ACI</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DYM OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: hydrolase]] | [[Category: hydrolase]] | ||
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Revision as of 10:36, 3 February 2008
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HUMICOLA INSOLENS ENDOCELLULASE CEL7B (EG 1) E197A MUTANT ENDOGLUCANASE, HYDROLASE, CELLULASE, CELLULOSE DEGRADATION, GLYCOSIDE HYDROLASE FAMILY 7, GLYCOSYNTHASE
OverviewOverview
Cellulose is the major polysaccharide component of the plant cell wall and, the most abundant naturally produced macromolecule on Earth. The enzymic, degradation of cellulose, by cellulases, is therefore of great, environmental and commercial significance. Cellulases are found in 12 of, the glycoside hydrolase families classified according to their amino acid, sequence similarities. Endoglucanase I (Cel7B), from the soft-rot fungus, Humicola insolens, is a family 7 enzyme. The structure of the native form, of Cel7B from H. insolens at 2.2 A resolution has been solved by molecular, replacement using the known Trichoderma reesei cellobiohydrolase I [Divne, Stahlberg, Reinikainen, Ruohonen, Pettersson, Knowles, Teeri and Jones, (1994) Science 265, 524-528] structure as the search model. Cel7B, catalyses hydrolysis of the beta-1,4 glycosidic linkages in cellulose with, net retention of anomeric configuration. The catalytic nucleophile at the, active site of Cel7B has been identified as Glu-197 by trapping of a, 2-deoxy-2-fluorocellotriosyl enzyme intermediate and identification of the, labelled peptide in peptic digests by tandem MS. Site-directed mutagenesis, of both Glu-197 and the prospective catalytic acid, Glu-202, results in, inactive enzyme, confirming the critical role of these groups for, catalysis.
About this StructureAbout this Structure
1DYM is a Single protein structure of sequence from Humicola insolens with as ligand. Active as Cellulase, with EC number 3.2.1.4 Known structural/functional Site: . Full crystallographic information is available from OCA.
ReferenceReference
Crystal structure of the family 7 endoglucanase I (Cel7B) from Humicola insolens at 2.2 A resolution and identification of the catalytic nucleophile by trapping of the covalent glycosyl-enzyme intermediate., MacKenzie LF, Sulzenbacher G, Divne C, Jones TA, Woldike HF, Schulein M, Withers SG, Davies GJ, Biochem J. 1998 Oct 15;335 ( Pt 2):409-16. PMID:9761741
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