4bmx

Native structure of futalosine hydrolase of Helicobacter pylori strain 26695

spinqualitylabelsall models 4bmx, resolution 1.76Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4bmx is a 2 chain structure with sequence from Campylobacter pylori. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ADE, TRS Related: 4bmy, 4bmz, 4bn0 Activity: Adenosylhomocysteine nucleosidase, with EC number 3.2.2.9 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [MTNN_HELPY] Responsible for cleavage of the glycosidic bond in both 5'-methylthioadenosine (MTA) and S-adenosylhomocysteine (SAH) (By similarity). Publication Abstract from PubMed The recently discovered futalosine pathway is a promising target for the development of new antibiotics. The enzymes involved in this pathway are crucial for the biosynthesis of the essential prokaryotic respiratory compound menaquinone, and as the pathway is limited to few bacterial species such as the gastric pathogen Helicobacter pylori it is a potential target for specific antibiotics. In this report, the crystal structure of an H. pylori methylthioadenosine nucleosidase (MTAN; an enzyme with broad specificity and activity towards 6-amino-6-deoxyfutalosine), which is involved in the second step of menaquinone biosynthesis, has been elucidated at a resolution of 1.76 A and refined with R factors of Rwork = 17% and Rfree = 21%. Activity studies on the wild type and active-site mutants show that the hydrolysis of 6-amino-6-deoxyfutalosine follows a mechanism similar to that of Escherichia coli MTAN. Further evidence for this mode of action is supplied by the crystal structures of active-site mutants. Through the use of reaction intermediates, the structures give additional evidence for the previously proposed nucleosidase mechanism. These structures and the confirmed reaction mechanism will provide a structural basis for the design of new inhibitors targeting the futalosine pathway. Structural enzymology of Helicobacter pylori methylthioadenosine nucleosidase in the futalosine pathway.,Kim RQ, Offen WA, Davies GJ, Stubbs KA Acta Crystallogr D Biol Crystallogr. 2014 Jan;70(Pt 1):177-85. doi:, 10.1107/S1399004713026655. Epub 2013 Dec 31. PMID:24419390 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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