3wd4

Serratia marcescens Chitinase B complexed with azide inhibitor and quinoline compound

spinqualitylabelsall models 3wd4, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3wd4 is a 1 chain structure with sequence from Serratia marcescens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: A1L, GOL, QUB, SO4 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CHIB_SERMA Publication Abstract from PubMed The Huisgen cycloaddition of azides and alkynes, accelerated by target biomolecules, termed "in situ click chemistry," has been successfully exploited to discover highly potent enzyme inhibitors. We have previously reported a specific Serratia marcescens chitinase B (SmChiB)-templated syn-triazole inhibitor generated in situ from an azide-bearing inhibitor and an alkyne fragment. Several in situ click chemistry studies have been reported. Although some mechanistic evidence has been obtained, such as X-ray analysis of [protein]-["click ligand"] complexes, indicating that proteins act as both mold and template between unique pairs of azide and alkyne fragments, to date, observations have been based solely on "postclick" structural information. Here, we describe crystal structures of SmChiB complexed with an azide ligand and an O-allyl oxime fragment as a mimic of a click partner, revealing a mechanism for accelerating syn-triazole formation, which allows generation of its own distinct inhibitor. We have also performed density functional theory calculations based on the X-ray structure to explore the acceleration of the Huisgen cycloaddition by SmChiB. The density functional theory calculations reasonably support that SmChiB plays a role by the cage effect during the pretranslation and posttranslation states of selective syn-triazole click formation. Observation of the controlled assembly of preclick components in the in situ click chemistry generation of a chitinase inhibitor.,Hirose T, Maita N, Gouda H, Koseki J, Yamamoto T, Sugawara A, Nakano H, Hirono S, Shiomi K, Watanabe T, Taniguchi H, Sharpless KB, Omura S, Sunazuka T Proc Natl Acad Sci U S A. 2013 Oct 1;110(40):15892-7. doi:, 10.1073/pnas.1315049110. Epub 2013 Sep 16. PMID:24043811 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Chitinase 3D structures

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