4OFC

2.0 Angstroms X-ray crystal structure of human 2-amino-3-carboxymuconate-6-semialdehye decarboxylase

4OFC の概要

• エントリーDOI: 10.2210/pdb4ofc/pdb
• 分子名称: 2-amino-3-carboxymuconate-6-semialdehyde decarboxylase, ZINC ION (3 entities in total)
• 機能のキーワード: tim-barrel, decarboxylase, oxidoreductase
• 由来する生物種: Homo sapiens (human)
• タンパク質・核酸の鎖数: 6
• 化学式量合計: 228123.11

構造登録者

Huo, L.,Liu, F.,Iwaki, H.,Chen, L.,Hasegawa, Y.,Liu, A. (登録日: 2014-01-14, 公開日: 2014-11-19, 最終更新日: 2023-09-20)

主引用文献

Huo, L.,Liu, F.,Iwaki, H.,Li, T.,Hasegawa, Y.,Liu, A.
Human alpha-amino-beta-carboxymuconate-epsilon-semialdehyde decarboxylase (ACMSD): A structural and mechanistic unveiling.
Proteins, 83:178-187, 2015

PubMed Abstract: Human α-amino-β-carboxymuconate-ε-semialdehyde decarboxylase determines the fate of tryptophan metabolites in the kynurenine pathway by controlling the quinolinate levels for de novo nicotinamide adenine dinucleotide biosynthesis. The unstable nature of its substrate has made gaining insight into its reaction mechanism difficult. Our electron paramagnetic resonance (EPR) spectroscopic study on the Cu-substituted human enzyme suggests that the native substrate does not directly ligate to the metal ion. Substrate binding did not result in a change of either the hyperfine structure or the super-hyperfine structure of the EPR spectrum. We also determined the crystal structure of the human enzyme in its native catalytically active state (at 1.99 Å resolution), a substrate analogue-bound form (2.50 Å resolution), and a selected active site mutant form with one of the putative substrate binding residues altered (2.32 Å resolution). These structures illustrate that each asymmetric unit contains three pairs of dimers. Consistent with the EPR findings, the ligand-bound complex structure shows that the substrate analogue does not directly coordinate to the metal ion but is bound to the active site by two arginine residues through noncovalent interactions.

PubMed: 25392945
DOI: 10.1002/prot.24722

実験手法

X-RAY DIFFRACTION (1.99 Å)