1z0s
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Crystal structure of an NAD kinase from Archaeoglobus fulgidus in complex with ATP
OverviewOverview
NAD kinase is a ubiquitous enzyme that catalyzes the phosphorylation of, NAD to NADP using ATP or inorganic polyphosphate (poly(P)) as phosphate, donor, and is regarded as the only enzyme responsible for the synthesis of, NADP. We present here the crystal structures of an NAD kinase from the, archaeal organism Archaeoglobus fulgidus in complex with its phosphate, donor ATP at 1.7 A resolution, with its substrate NAD at 3.05 A, resolution, and with the product NADP in two different crystal forms at, 2.45 A and 2.0 A resolution, respectively. In the ATP bound structure, the, AMP portion of the ATP molecule is found to use the same binding site as, the nicotinamide ribose portion of NAD/NADP in the NAD/NADP bound, structures. A magnesium ion is found to be coordinated to the phosphate, tail of ATP as well as to a pyrophosphate group. The conserved GGDG loop, forms hydrogen bonds with the pyrophosphate group in the ATP-bound, structure and the 2' phosphate group of the NADP in the NADP-bound, structures. A possible phosphate transfer mechanism is proposed on the, basis of the structures presented.
About this StructureAbout this Structure
1Z0S is a Single protein structure of sequence from Archaeoglobus fulgidus with MG, ATP and POP as ligands. Active as NAD(+) kinase, with EC number 2.7.1.23 Full crystallographic information is available from OCA.
ReferenceReference
Crystal structures of an NAD kinase from Archaeoglobus fulgidus in complex with ATP, NAD, or NADP., Liu J, Lou Y, Yokota H, Adams PD, Kim R, Kim SH, J Mol Biol. 2005 Nov 25;354(2):289-303. Epub 2005 Sep 30. PMID:16242716
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