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- W2043670023 abstract "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." @default.
- W2043670023 created "2016-06-24" @default.
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- W2043670023 date "2004-12-01" @default.
- W2043670023 modified "2023-10-18" @default.
- W2043670023 title "The crystal structure of Ym1 at 1.31Å resolution" @default.
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- W2043670023 doi "https://doi.org/10.1016/j.jsb.2004.07.002" @default.
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