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| [[Image:1a3h.gif|left|200px]] | | {{Seed}} |
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| {{STRUCTURE_1a3h| PDB=1a3h | SCENE= }} | | {{STRUCTURE_1a3h| PDB=1a3h | SCENE= }} |
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| '''ENDOGLUCANASE CEL5A FROM BACILLUS AGARADHERANS AT 1.6A RESOLUTION'''
| | ===ENDOGLUCANASE CEL5A FROM BACILLUS AGARADHERANS AT 1.6A RESOLUTION=== |
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| ==Overview==
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| The enzymatic degradation of cellulose, by cellulases, is not only industrially important in the food, paper, and textile industries but also a potentially useful method for the environmentally friendly recycling of municipal waste. An understanding of the structural and mechanistic requirements for the hydrolysis of the beta-1,4 glycosidic bonds of cellulose is an essential prerequisite for beneficial engineering of cellulases for these processes. Cellulases have been classified into 13 of the 62 glycoside hydrolase families [Henrissat, B., and Bairoch, A. (1996) Biochem J. 316, 695-696]. The structure of the catalytic core of the family 5 endoglucanase, Ce15A, from the alkalophilic Bacillus agaradherans has been solved by multiple isomorphous replacement at 1.6 A resolution. Ce15A has the (alpha/beta)8 barrel structure and signature structural features typical of the grouping of glycoside hydrolase families known as clan GH-A, with the catalytic acid/base Glu 139 and nucleophile Glu 228 on barrel strands beta 4 and beta 7 as expected. In addition to the native enzyme, the 2.0 A resolution structure of the cellobiose-bound form of the enzyme has also been determined. Cellobiose binds preferentially in the -2 and -3 subsites of the enzyme. Kinetic studies on the isolated catalytic core domain of Ce15A, using a series of reduced cellodextrins as substrates, suggest approximately five to six binding sites, consistent with the shape and size of the cleft observed by crystallography. | | The line below this paragraph, {{ABSTRACT_PUBMED_9485319}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 9485319 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_9485319}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Glycoside hydrolase family 5]] | | [[Category: Glycoside hydrolase family 5]] |
| [[Category: Hydrolase]] | | [[Category: Hydrolase]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:45:25 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 15:55:38 2008'' |