1SUW

Crystal structure of a NAD kinase from Archaeoglobus fulgidus in complex with its substrate and product: Insights into the catalysis of NAD kinase

1SUW の概要

• エントリーDOI: 10.2210/pdb1suw/pdb
• 分子名称: Probable inorganic polyphosphate/ATP-NAD kinase, NADP NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE (3 entities in total)
• 機能のキーワード: atp-nad kinase, nadk, nad, nadp, structural genomics, bsgc structure funded by nih, protein structure initiative, psi, berkeley structural genomics center, transferase
• 由来する生物種: Archaeoglobus fulgidus
• 細胞内の位置: Cytoplasm : O30297
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 114595.36

構造登録者

Liu, J.,Lou, Y.,Yokota, H.,Adams, P.D.,Kim, R.,Kim, S.-H.,Berkeley Structural Genomics Center (BSGC) (登録日: 2004-03-26, 公開日: 2004-08-24, 最終更新日: 2024-02-14)

主引用文献

Liu, J.,Lou, Y.,Yokota, H.,Adams, P.D.,Kim, R.,Kim, S.-H.
Crystal Structures of an NAD Kinase from Archaeoglobus fulgidus in Complex with ATP, NAD, or NADP
J.Mol.Biol., 354:289-303, 2005

PubMed Abstract: 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.

PubMed: 16242716
DOI: 10.1016/j.jmb.2005.09.026

実験手法

X-RAY DIFFRACTION (2.45 Å)