1e6c

K15M MUTANT OF SHIKIMATE KINASE FROM ERWINIA CHRYSANTHEMI

spinqualitylabelsall models 1e6c, resolution 1.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1e6c is a 2 chain structure with sequence from Erwinia chrysanthemi. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, MPD, MRD, PO4 Related: 2shk, 1shk Gene: AROL (Erwinia chrysanthemi) Activity: Shikimate kinase, with EC number 2.7.1.71 Resources: FirstGlance, OCA, RCSB, PDBsum Function [AROL_ERWCH] Catalyzes the specific phosphorylation of the 3-hydroxyl group of shikimic acid using ATP as a cosubstrate. 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 Shikimate kinase, despite low sequence identity, has been shown to be structurally a member of the nucleoside monophosphate (NMP) kinase family, which includes adenylate kinase. In this paper we have explored the roles of residues in the P-loop of shikimate kinase, which forms the binding site for nucleotides and is one of the most conserved structural features in proteins. In common with many members of the P-loop family, shikimate kinase contains a cysteine residue 2 amino acids upstream of the essential lysine residue; the side chains of these residues are shown to form an ion pair. The C13S mutant of shikimate kinase was found to be enzymatically active, whereas the K15M mutant was inactive. However, the latter mutant had both increased thermostability and affinity for ATP when compared to the wild-type enzyme. The structure of the K15M mutant protein has been determined at 1.8 A, and shows that the organization of the P-loop and flanking regions is heavily disturbed. This indicates that, besides its role in catalysis, the P-loop lysine also has an important structural role. The structure of the K15M mutant also reveals that the formation of an additional arginine/aspartate ion pair is the most likely reason for its increased thermostability. From studies of ligand binding it appears that, like adenylate kinase, shikimate kinase binds substrates randomly and in a synergistic fashion, indicating that the two enzymes have similar catalytic mechanisms. Biochemical and X-ray crystallographic studies on shikimate kinase: the important structural role of the P-loop lysine.,Krell T, Maclean J, Boam DJ, Cooper A, Resmini M, Brocklehurst K, Kelly SM, Price NC, Lapthorn AJ, Coggins JR Protein Sci. 2001 Jun;10(6):1137-49. PMID:11369852 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Shikimate kinase

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