1LHP

Crystal Structure of Pyridoxal Kinase from Sheep Brain

1LHP の概要

• エントリーDOI: 10.2210/pdb1lhp/pdb
• 関連するPDBエントリー: 1LHR
• 分子名称: Pyridoxal kinase (2 entities in total)
• 機能のキーワード: alpha-beta structure, transferase
• 由来する生物種: Ovis aries (sheep)
• 細胞内の位置: Cytoplasm: P82197
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 69721.76

構造登録者

Liang, D.C.,Jiang, T.,Li, M.H. (登録日: 2002-04-17, 公開日: 2003-02-11, 最終更新日: 2024-03-13)

主引用文献

Li, M.H.,Kwok, F.,Chang, W.R.,Lau, C.K.,Zhang, J.P.,Lo, S.C.,Jiang, T.,Liang, D.C.
Crystal structure of brain pyridoxal kinase, a novel member of the ribokinase superfamily
J.BIOL.CHEM., 277:46385-46390, 2002

PubMed Abstract: The three-dimensional structures of brain pyridoxal kinase and its complex with the nucleotide ATP have been elucidated in the dimeric form at 2.1 and 2.6 A, respectively. Results have shown that pyridoxal kinase, as an enzyme obeying random sequential kinetics in catalysis, does not possess a lid shape structure common to all kinases in the ribokinase superfamily. This finding has been shown to be in line with the condition that pyridoxal kinase binds substrates with variable sizes of chemical groups at position 4 of vitamin B(6) and its derivatives. In addition, the enzyme contains a 12-residue peptide loop in the active site for the prevention of premature hydrolysis of ATP. Conserved amino acid residues Asp(118) and Tyr(127) in the peptide loop could be moved to a position covering the nucleotide after its binding so that its chance to hydrolyze in the aqueous environment of the active site was reduced. With respect to the evolutionary trend of kinase enzymes, the existence of this loop in pyridoxal kinase could be classified as an independent category in the ribokinase superfamily according to the structural feature found and mechanism followed in catalysis.

PubMed: 12235162
DOI: 10.1074/jbc.M208600200

実験手法

X-RAY DIFFRACTION (2.1 Å)