2nt8 | pdb_00002nt8

ATP bound at the active site of a PduO type ATP:co(I)rrinoid adenosyltransferase from Lactobacillus reuteri

spinqualitylabelsall models 2nt8, resolution 1.68Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2nt8 is a 1 chain structure with sequence from Lactobacillus reuteri. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ATP, GOL, MG, SO4 Gene: pduo (Lactobacillus reuteri) Activity: Cob(I)yrinic acid a,c-diamide adenosyltransferase, with EC number 2.5.1.17 Resources: FirstGlance, OCA, RCSB, PDBsum 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 three-dimensional crystal structure of the PduO-type corrinoid adenosyltransferase from Lactobacillus reuteri (LrPduO) has been solved to 1.68-A resolution. The functional assignment of LrPduO as a corrinoid adenosyltransferase was confirmed by in vivo and in vitro evidence. The enzyme has an apparent Km(ATP) of 2.2 microM and Km(Cobalamin) of 0.13 microM and a kcat of 0.025 s(-1). Co-crystallization of the enzyme with Mg-ATP resulted in well-defined electron density for an N-terminal loop that had been disordered in other PduO-type enzyme structures. This newly defined N-terminal loop makes up the lower portion of the enzyme active site with the other half being contributed from an adjacent subunit. These results provide the first detailed description of the enzyme active site for a PduO-type adenosyltransferase and identify a unique ATP binding motif at the protein N terminus. The molecular architecture at the active site offers valuable new insight into the role of various residues responsible for the human disease methylmalonic aciduria. Structural characterization of the active site of the PduO-type ATP:Co(I)rrinoid adenosyltransferase from Lactobacillus reuteri.,St Maurice M, Mera PE, Taranto MP, Sesma F, Escalante-Semerena JC, Rayment I J Biol Chem. 2007 Jan 26;282(4):2596-605. Epub 2006 Nov 22. PMID:17121823 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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