1IH8

NH3-dependent NAD+ Synthetase from Bacillus subtilis Complexed with AMP-CPP and Mg2+ ions.

1IH8 の概要

• エントリーDOI: 10.2210/pdb1ih8/pdb
• 関連するPDBエントリー: 1EE1 1FYD 1IFX 1NSY 2NSY
• 分子名称: NH(3)-DEPENDENT NAD(+) synthetase, MAGNESIUM ION, DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER, ... (4 entities in total)
• 機能のキーワード: ligase, amidotransferase, atp pyrophosphatase, active-site loops
• 由来する生物種: Bacillus subtilis
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 61186.11

構造登録者

Devedjiev, Y.,Symersky, J.,Singh, R.,Jedrzejas, M.,Brouillette, C.,Brouillette, W.,Muccio, D.,Chattopadhyay, D.,DeLucas, L. (登録日: 2001-04-18, 公開日: 2001-06-06, 最終更新日: 2023-08-16)

主引用文献

Devedjiev, Y.,Symersky, J.,Singh, R.,Jedrzejas, M.,Brouillette, C.,Brouillette, W.,Muccio, D.,Chattopadhyay, D.,DeLucas, L.
Stabilization of active-site loops in NH3-dependent NAD+ synthetase from Bacillus subtilis.
Acta Crystallogr.,Sect.D, 57:806-812, 2001

PubMed Abstract: The NH(3)-dependent NAD(+) synthetase (NADS) participates in the biosynthesis of nicotinamide adenine dinucleotide (NAD(+)) by transforming nicotinic acid adenine dinucleotide (NaAD) to NAD(+). The structural behavior of the active site, including stabilization of flexible loops 82-87 and 204-225, has been studied by determination of the crystal structures of complexes of NADS with natural substrates and a substrate analog. Both loops are stabilized independently of NaAD and solely from the ATP-binding site. Analysis of the binding contacts suggests that the minor loop 82-87 is stabilized primarily by a hydrogen bond with the adenine base of ATP. Formation of a coordination complex with Mg(2+) in the ATP-binding site may contribute to the stabilization of the major loop 204-225. The major loop has a role in substrate recognition and stabilization, in addition to the protection of the reaction intermediate described previously. A second and novel Mg(2+) position has been observed closer to the NaAD-binding site in the structure crystallized at pH 7.5, where the enzyme is active. This could therefore be the catalytically active Mg(2+).

PubMed: 11375500
DOI: 10.1107/S0907444901003523

実験手法

X-RAY DIFFRACTION (1.9 Å)