1k2x

Crystal structure of putative asparaginase encoded by Escherichia coli ybiK gene

spinqualitylabelsall models 1k2x, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1k2x is a 4 chain structure with sequence from "bacillus_coli"_migula_1895 "bacillus coli" migula 1895. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, NA NonStd Res: CME Related: 1jn9, 1apz, 1ayy, 2gac, 2gaw, 9gaa, 9gac, 9gaf, 1apy Gene: ybiK ("Bacillus coli" Migula 1895) Activity: Asparaginase, with EC number 3.5.1.1 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [IAAA_ECOLI] Degrades proteins damaged by L-isoaspartyl residue formation (also known as beta-Asp residues). Degrades L-isoaspartyl-containing di- and maybe also tripeptides. Also has L-asparaginase activity, although this may not be its principal function. May be involved in glutathione, and possibly other peptide, transport, although these results could also be due to polar effects of disruption. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Plant-type L-asparaginases hydrolyze the side-chain amide bond of L-asparagine or its beta-peptides. They belong to the N-terminal nucleophile (Ntn) hydrolases and are synthesized as inactive precursor molecules. Activation occurs via the autoproteolytic release of two subunits, alpha and beta, the latter of which carries the nucleophile at its N-terminus. Crystallographic studies of plant-type asparaginases have focused on an Escherichia coli homologue (EcAIII), which has been crystallized in several crystal forms. Although they all belong to the same P2 1 2 1 2 1 space group with similar unit-cell parameters, they display different crystal-packing arrangements and thus should be classified as separate polymorphs. This variability stems mainly from different positions of the EcAIII molecules within the unit cell, although they also exhibit slight differences in orientation. The intermolecular interactions that trigger different crystal lattice formation are mediated by ions, which represent the most variable component of the crystallization conditions. This behaviour confirms recent observations that small molecules might promote protein crystal lattice formation. Crystal packing of plant-type L-asparaginase from Escherichia coli.,Michalska K, Borek D, Hernandez-Santoyo A, Jaskolski M Acta Crystallogr D Biol Crystallogr. 2008 Mar;64(Pt 3):309-20. Epub 2008, Feb 20. PMID:18323626 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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