1qox
From Proteopedia
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BETA-GLUCOSIDASE FROM BACILLUS CIRCULANS SP. ALKALOPHILUS
Overview
Family 1 of glycosyl hydrolases is a large and biologically important group of enzymes. A new three-dimensional structure of this family, beta-glucosidase from Bacillus circulans sp. alkalophilus is reported here. This is the first structure of beta-glucosidase from an alkaliphilic organism. The model was determined by the molecular replacement method and refined to a resolution of 2.7 A. The quaternary structure of B. circulans sp. alkalophilus beta-glucosidase is an octamer and subunits of the octamer show a similar (beta/alpha)(8) barrel fold to that previously reported for other family 1 enzymes. The crystal structure suggested that Cys169 in the active site is substituted. The Cys169 is located near the putative acid/base catalyst Glu166 and it may contribute to the high pH optimum of the enzyme. The crystal structure also revealed that the asymmetric unit contains two octamers which have a clear binding interaction with each other. The ability of the octamers to link with each other suggested that beta-glucosidase from Bacillus circulans sp. alkalophilus is able to form long polymeric assemblies, at least in the crystalline state.
About this Structure
1QOX is a Single protein structure of sequence from Bacillus circulans. Active as Beta-glucosidase, with EC number 3.2.1.21 Known structural/functional Sites: , , , , , , , , , , , , , , and . Full crystallographic information is available from OCA.
Reference
The crystal structure of beta-glucosidase from Bacillus circulans sp. alkalophilus: ability to form long polymeric assemblies., Hakulinen N, Paavilainen S, Korpela T, Rouvinen J, J Struct Biol. 2000 Feb;129(1):69-79. PMID:10675298
Page seeded by OCA on Thu Feb 21 14:42:04 2008
