1dts

CRYSTAL STRUCTURE OF AN ATP DEPENDENT CARBOXYLASE, DETHIOBIOTIN SYNTHASE, AT 1.65 ANGSTROMS RESOLUTION

spinqualitylabelsall models 1dts, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1dts is a 1 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Activity: Dethiobiotin synthase, with EC number 6.3.3.3 Resources: FirstGlance, OCA, RCSB, PDBsum Function [BIOD_ECOLI] Catalyzes a mechanistically unusual reaction, the ATP-dependent insertion of CO2 between the N7 and N8 nitrogen atoms of 7,8-diaminopelargonic acid (DAPA) to form an ureido ring. Only CTP can partially replace ATP while diaminobiotin is only 37% as effective as 7,8-diaminopelargonic acid. 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 BACKGROUND: In Escherichia coli, the enzymes of the biotin biosynthesis pathway are encoded by the bio operon. One of these enzymes, ATP-dependent dethiobiotin synthetase, catalyzes the carboxylation of 7,8-diaminopelargonic acid leading to the formation of the ureido ring of biotin. The enzyme belongs to the class of ATP-dependent carboxylases and we present here the first crystal structure determined for this class of enzyme. RESULTS: We have determined the crystal structure of homodimeric dethiobiotin synthetase to 1.65 A resolution. The subunit consists of a seven-stranded parallel beta-sheet, surrounded by alpha-helices. The sheet contains the classical mononucleotide-binding motif with a fingerprint peptide Gly-X-X-X-X-X-Gly-Lys-Thr. The mononucleotide binding part of the structure is very similar to the GTP-binding protein H-ras-p21 and thus all GTP-binding proteins. A comparison reveals that some of the residues, which in H-ras-p21 interact with the nucleotide and the metal ion, are conserved in the synthetase. CONCLUSIONS: The three-dimensional structure of dethiobiotin synthetase has revealed that ATP-dependent carboxylases contain the classical mononucleotide-binding fold. Considerable similarities to the structure of the GTP-binding protein H-ras-p21 were found, indicating that both proteins might have evolved from a common ancestral mononucleotide-binding fold. Crystal structure of an ATP-dependent carboxylase, dethiobiotin synthetase, at 1.65 A resolution.,Huang W, Lindqvist Y, Schneider G, Gibson KJ, Flint D, Lorimer G Structure. 1994 May 15;2(5):407-14. PMID:8081756 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Dethiobiotin synthetase

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