1vf8
From Proteopedia
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The Crystal Structure of Ym1 at 1.31 A Resolution
Overview
Upon nematode infection, murine peritoneal macrophages synthesize and, secrete large amounts of the Ym1 protein, which is a unique functional, marker for alternatively activated macrophages in T(H)2-mediated, inflammatory responses. Ym1 shares significant structural similarity to, the family 18 chitinases. Previously, Ym1 has been studied with respect to, its carbohydrate-binding ability and glycosyl hydrolysis activity and this, has led to various inconclusive interpretations. Our present, co-crystallization and soaking experiments with various glucosamine or, N-acetylglucosamine oligomers yield only the uncomplexed Ym1. The refined, Ym1 structure at 1.31A resolution clearly displays a water cluster forming, an extensive hydrogen bond network with the "active-site" residues. This, water cluster contributes notable electron density to lower resolution, maps and this might have misled and given rise to a previous proposal for, a monoglucosamine-binding site for Ym1. A structural comparison of family, 18 glycosidase (-like) proteins reveals a lack of several conserved, residues in Ym1, and illustrates the versatility of the divergent active, sites. Therefore, Ym1 may lack N-acetylglucosamine-binding affinity, and, this suggests that a new direction should be taken to unravel the function, of Ym1.
About this Structure
1VF8 is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.
Reference
The crystal structure of Ym1 at 1.31 A resolution., Tsai ML, Liaw SH, Chang NC, J Struct Biol. 2004 Dec;148(3):290-6. PMID:15522777
Page seeded by OCA on Wed Nov 21 04:48:03 2007
