1xup

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{{STRUCTURE_1xup| PDB=1xup | SCENE= }}
{{STRUCTURE_1xup| PDB=1xup | SCENE= }}
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'''ENTEROCOCCUS CASSELIFLAVUS GLYCEROL KINASE COMPLEXED WITH GLYCEROL'''
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===ENTEROCOCCUS CASSELIFLAVUS GLYCEROL KINASE COMPLEXED WITH GLYCEROL===
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==Overview==
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The first structure of a glycerol kinase from a Gram-positive organism, Enterococcus casseliflavus, has been determined to 2.8 A resolution in the presence of glycerol and to 2.5 A resolution in the absence of substrate. The substrate-induced closure of 7 degrees is significantly smaller than that reported for hexokinase, a model for substrate-mediated domain closure that has been proposed for glycerol kinase. Despite the 78% level of sequence identity and conformational similarity in the catalytic cleft regions of the En. casseliflavus and Escherichia coli glycerol kinases, remarkable structural differences have now been identified. These differences correlate well with their divergent regulatory schemes of activation by phosphorylation in En. casseliflavus and allosteric inhibition in E. coli. On the basis of our structural results, we propose a mechanism by which the phosphorylation of a histidyl residue located 25 A from the active site results in a 10-15-fold increase in the activity of the enterococcal glycerol kinase.
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{{ABSTRACT_PUBMED_14717590}}
==About this Structure==
==About this Structure==
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[[Category: Yeh, J I.]]
[[Category: Yeh, J I.]]
[[Category: Transferase]]
[[Category: Transferase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 15:31:58 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 05:10:21 2008''

Revision as of 02:10, 29 July 2008

Image:1xup.png

Template:STRUCTURE 1xup

ENTEROCOCCUS CASSELIFLAVUS GLYCEROL KINASE COMPLEXED WITH GLYCEROL

Template:ABSTRACT PUBMED 14717590

About this Structure

1XUP is a Single protein structure of sequence from Enterococcus casseliflavus. Full crystallographic information is available from OCA.

Reference

Structures of enterococcal glycerol kinase in the absence and presence of glycerol: correlation of conformation to substrate binding and a mechanism of activation by phosphorylation., Yeh JI, Charrier V, Paulo J, Hou L, Darbon E, Claiborne A, Hol WG, Deutscher J, Biochemistry. 2004 Jan 20;43(2):362-73. PMID:14717590

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