3aqu

Crystal structure of a class V chitinase from Arabidopsis thaliana

spinqualitylabelsall models 3aqu, resolution 2.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3aqu is a 4 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.01Å Ligands: FLC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CHIC_ARATH Can hydrolyze glycol chitin and chitin oligosaccharides (e.g. N-acetylglucosamine) (GlcNAc)4, (GlcNAc)5 and (GlcNAc)6 (PubMed:21390509, PubMed:22936594). Hydrolyzes N-acetylglucosamine oligomers producing dimers from the non-reducing end of the substrates (PubMed:21390509). Publication Abstract from PubMed Expression of a class V chitinase gene (At4g19810, AtChiC) in Arabidopsis thaliana was examined by quantitative real-time PCR and by analyzing microarray data available at Genevestigator. The gene expression was induced by the plant stress-related hormones abscisic acid (ABA) and jasmonic acid (JA) and by the stress resulting from the elicitor flagellin, NaCl, and osmosis. The recombinant AtChiC protein was produced in E. coli, purified, and characterized with respect to the structure and function. The recombinant AtChiC hydrolyzed N-acetylglucosamine oligomers producing dimers from the non-reducing end of the substrates. The crystal structure of AtChiC was determined by the molecular replacement method at 2.0 A resolution. AtChiC was found to adopt an (beta/alpha)(8) fold with a small insertion domain composed of an alpha-helix and a five-stranded beta-sheet. From docking simulation of AtChiC with pentameric substrate, the amino acid residues responsible for substrate binding were found to be well conserved when compared with those of the class V chitinase from Nicotiana tabacum (NtChiV). All of the structural and functional properties of AtChiC are quite similar to those obtained for NtChiV, and seem to be common to class V chitinases from higher plants. A class V chitinase from Arabidopsis thaliana: gene responses, enzymatic properties, and crystallographic analysis.,Ohnuma T, Numata T, Osawa T, Mizuhara M, Lampela O, Juffer AH, Skriver K, Fukamizo T Planta. 2011 Jul;234(1):123-37. Epub 2011 Mar 9. PMID:21390509 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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