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| - | [[Image:1ctn.gif|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_1ctn| PDB=1ctn | SCENE= }} | | {{STRUCTURE_1ctn| PDB=1ctn | SCENE= }} |
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| - | '''CRYSTAL STRUCTURE OF A BACTERIAL CHITINASE AT 2.3 ANGSTROMS RESOLUTION'''
| + | ===CRYSTAL STRUCTURE OF A BACTERIAL CHITINASE AT 2.3 ANGSTROMS RESOLUTION=== |
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| - | ==Overview==
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| - | BACKGROUND: Chitinases cleave the beta-1-4-glycosidic bond between the N-acetyl-D-glucosamine units of which chitin is comprised. Chitinases are present in plants, bacteria and fungi, but whereas structures are available for two prototypic plant enzymes, no structure is available for a bacterial or fungal chitinase. RESULTS: To redress this imbalance, the structure of native chitinase A from Serratia marcescens has been solved by multiple isomorphous replacement and refined at 2.3 A resolution, resulting in a crystallographic R-factor of 16.2%. The enzyme comprises three domains: an all beta-strand amino-terminal domain, a catalytic alpha/beta-barrel domain, and a small alpha+beta-fold domain. There are several residues with unusual geometries in the structure. Structure determination of chitinase A in complex with N,N',N",N"'-tetra-acetylo-chitotetraose, together with biochemical and sequence analysis data, enabled the positions of the active-site and catalytic residues to be proposed. CONCLUSIONS: The reaction mechanism seems to be similar to that of lysozyme and most other glycosylhydrolases, i.e. general acid-base catalysis. The role of the amino-terminal domain could not be identified, but it has similarities to the fibronectin III domain. This domain may possibly facilitate the interaction of chitinase A with chitin.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_7704527}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 7704527 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_7704527}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Vorgias, C E.]] | | [[Category: Vorgias, C E.]] |
| | [[Category: Wilson, K S.]] | | [[Category: Wilson, K S.]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 13:05:57 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 21:20:57 2008'' |
Revision as of 18:20, 30 June 2008
Template:STRUCTURE 1ctn
CRYSTAL STRUCTURE OF A BACTERIAL CHITINASE AT 2.3 ANGSTROMS RESOLUTION
Template:ABSTRACT PUBMED 7704527
About this Structure
1CTN is a Single protein structure of sequence from Serratia marcescens. Full crystallographic information is available from OCA.
Reference
Crystal structure of a bacterial chitinase at 2.3 A resolution., Perrakis A, Tews I, Dauter Z, Oppenheim AB, Chet I, Wilson KS, Vorgias CE, Structure. 1994 Dec 15;2(12):1169-80. PMID:7704527
Page seeded by OCA on Mon Jun 30 21:20:57 2008
