1y3h
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Crystal Structure of Inorganic Polyphosphate/ATP-NAD kinase from Mycobacterium tuberculosis
OverviewOverview
NAD kinase is a key enzyme in NADP biosynthesis. We solved the crystal, structure of polyphosphate/ATP-NAD kinase from Mycobacterium tuberculosis, (Ppnk) complexed with NAD (Ppnk-NAD) at 2.6A resolution using apo-Ppnk, structure solved in this work, and revealed the details of the structure, and NAD-binding site. Superimposition of tertiary structures of apo-Ppnk, and Ppnk-NAD demonstrated a substantial conformational difference in a, loop (Ppnk-flexible loop). As a quaternary structure, these Ppnk, structures exhibited tetramer as in solution condition. Notably, the, Ppnk-flexible loop was involved in the intersubunit contact and probably, related to the NAD-binding of the other subunit. Furthermore, the two, residues (Asp189, His226) substantially contributed to creating, NAD-binding site on the other subunit. The two residues and the residues, involved in NAD-binding were conserved. However, residues corresponding to, the Ppnk-flexible loop were not conserved, making us to speculate that the, Ppnk-flexible loop may be Ppnk-specific.
About this StructureAbout this Structure
1Y3H is a Single protein structure of sequence from Mycobacterium tuberculosis. Active as NAD(+) kinase, with EC number 2.7.1.23 Full crystallographic information is available from OCA.
ReferenceReference
NAD-binding mode and the significance of intersubunit contact revealed by the crystal structure of Mycobacterium tuberculosis NAD kinase-NAD complex., Mori S, Yamasaki M, Maruyama Y, Momma K, Kawai S, Hashimoto W, Mikami B, Murata K, Biochem Biophys Res Commun. 2005 Feb 11;327(2):500-8. PMID:15629142
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