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1eqc
From Proteopedia
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| - | [[Image:1eqc.gif|left|200px]] | + | [[Image:1eqc.gif|left|200px]] |
| - | + | ||
| - | '''EXO-B-(1,3)-GLUCANASE FROM CANDIDA ALBICANS IN COMPLEX WITH CASTANOSPERMINE AT 1.85 A''' | + | {{Structure |
| + | |PDB= 1eqc |SIZE=350|CAPTION= <scene name='initialview01'>1eqc</scene>, resolution 1.85Å | ||
| + | |SITE= | ||
| + | |LIGAND= <scene name='pdbligand=CTS:CASTANOSPERMINE'>CTS</scene> | ||
| + | |ACTIVITY= [http://en.wikipedia.org/wiki/Glucan_1,3-beta-glucosidase Glucan 1,3-beta-glucosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.58 3.2.1.58] | ||
| + | |GENE= | ||
| + | }} | ||
| + | |||
| + | '''EXO-B-(1,3)-GLUCANASE FROM CANDIDA ALBICANS IN COMPLEX WITH CASTANOSPERMINE AT 1.85 A''' | ||
| + | |||
==Overview== | ==Overview== | ||
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==About this Structure== | ==About this Structure== | ||
| - | 1EQC is a [ | + | 1EQC is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Candida_albicans Candida albicans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1EQC OCA]. |
==Reference== | ==Reference== | ||
| - | The structure of the exo-beta-(1,3)-glucanase from Candida albicans in native and bound forms: relationship between a pocket and groove in family 5 glycosyl hydrolases., Cutfield SM, Davies GJ, Murshudov G, Anderson BF, Moody PC, Sullivan PA, Cutfield JF, J Mol Biol. 1999 Dec 3;294(3):771-83. PMID:[http:// | + | The structure of the exo-beta-(1,3)-glucanase from Candida albicans in native and bound forms: relationship between a pocket and groove in family 5 glycosyl hydrolases., Cutfield SM, Davies GJ, Murshudov G, Anderson BF, Moody PC, Sullivan PA, Cutfield JF, J Mol Biol. 1999 Dec 3;294(3):771-83. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10610795 10610795] |
[[Category: Candida albicans]] | [[Category: Candida albicans]] | ||
[[Category: Glucan 1,3-beta-glucosidase]] | [[Category: Glucan 1,3-beta-glucosidase]] | ||
| Line 22: | Line 31: | ||
[[Category: Sullivan, P A.]] | [[Category: Sullivan, P A.]] | ||
[[Category: CTS]] | [[Category: CTS]] | ||
| - | [[Category: candida | + | [[Category: candida albican]] |
[[Category: exo-glucanase]] | [[Category: exo-glucanase]] | ||
| - | [[Category: mechanism-based | + | [[Category: mechanism-based inhibitor]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 10:59:02 2008'' |
Revision as of 08:59, 20 March 2008
| |||||||
| , resolution 1.85Å | |||||||
|---|---|---|---|---|---|---|---|
| Ligands: | |||||||
| Activity: | Glucan 1,3-beta-glucosidase, with EC number 3.2.1.58 | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
EXO-B-(1,3)-GLUCANASE FROM CANDIDA ALBICANS IN COMPLEX WITH CASTANOSPERMINE AT 1.85 A
Overview
A group of fungal exo-beta-(1,3)-glucanases, including that from the human pathogen Candida albicans (Exg), belong to glycosyl hydrolase family 5 that also includes many bacterial cellulases (endo-beta-1, 4-glucanases). Family members, despite wide sequence variations, share a common mechanism and are characterised by possessing eight invariant residues making up the active site. These include two glutamate residues acting as nucleophile and acid/base, respectively. Exg is an abundant secreted enzyme possessing both hydrolase and transferase activity consistent with a role in cell wall glucan metabolism and possibly morphogenesis. The structures of Exg in both free and inhibited forms have been determined to 1.9 A resolution. A distorted (beta/alpha)8 barrel structure accommodates an active site which is located within a deep pocket, formed when extended loop regions close off a cellulase-like groove. Structural analysis of a covalently bound mechanism-based inhibitor (2-fluoroglucosylpyranoside) and of a transition-state analogue (castanospermine) has identified the binding interactions at the -1 glucose binding site. In particular the carboxylate of Glu27 serves a dominant hydrogen-bonding role. Access by a 1,3-glucan chain to the pocket in Exg can be understood in terms of a change in conformation of the terminal glucose residue from chair to twisted boat. The geometry of the pocket is not, however, well suited for cleavage of 1,4-glycosidic linkages. A second glucose site was identified at the entrance to the pocket, sandwiched between two antiparallel phenylalanine side-chains. This aromatic entrance-way must not only direct substrate into the pocket but also may act as a clamp for an acceptor molecule participating in the transfer reaction.
About this Structure
1EQC is a Single protein structure of sequence from Candida albicans. Full crystallographic information is available from OCA.
Reference
The structure of the exo-beta-(1,3)-glucanase from Candida albicans in native and bound forms: relationship between a pocket and groove in family 5 glycosyl hydrolases., Cutfield SM, Davies GJ, Murshudov G, Anderson BF, Moody PC, Sullivan PA, Cutfield JF, J Mol Biol. 1999 Dec 3;294(3):771-83. PMID:10610795
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