1sr9

Crystal Structure of LeuA from Mycobacterium tuberculosis

spinqualitylabelsall models 1sr9, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1sr9 is a 2 chain structure with sequence from "bacillus_tuberculosis"_(zopf_1883)_klein_1884 "bacillus tuberculosis" (zopf 1883) klein 1884. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, KIV, ZN NonStd Res: MSE Activity: 2-isopropylmalate synthase, with EC number 2.3.3.13 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [LEU1_MYCTU] Catalyzes the condensation of the acetyl group of acetyl-CoA with 3-methyl-2-oxobutanoate (2-oxoisovalerate) to form 3-carboxy-3-hydroxy-4-methylpentanoate (2-isopropylmalate) (By similarity). 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 The leucine biosynthetic pathway is essential for the growth of Mycobacterium tuberculosis and is a potential target for the design of new anti-tuberculosis drugs. The crystal structure of alpha-isopropylmalate synthase, which catalyzes the first committed step in this pathway, has been determined by multiwavelength anomalous dispersion methods and refined at 2.0-A resolution in complex with its substrate alpha-ketoisovalerate. The structure reveals a tightly associated, domain-swapped dimer in which each monomer comprises an (alpha/beta)(8) TIM barrel catalytic domain, a helical linker domain, and a regulatory domain of novel fold. Mutational and crystallographic data indicate the latter as the site for leucine feedback inhibition of activity. Domain swapping enables the linker domain of one monomer to sit over the catalytic domain of the other, inserting residues into the active site that may be important in catalysis. The alpha-ketoisovalerate substrate binds to an active site zinc ion, adjacent to a cavity that can accommodate acetyl-CoA. Sequence and structural similarities point to a catalytic mechanism similar to that of malate synthase and an evolutionary relationship with an aldolase that catalyzes the reverse reaction on a similar substrate. Crystal structure of LeuA from Mycobacterium tuberculosis, a key enzyme in leucine biosynthesis.,Koon N, Squire CJ, Baker EN Proc Natl Acad Sci U S A. 2004 Jun 1;101(22):8295-300. Epub 2004 May 24. PMID:15159544 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also 2-isopropylmalate synthase 3D structures

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