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基本情報
登録情報 | データベース: PDB / ID: 6mgs | ||||||||||||
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タイトル | Crystal structure of alpha-Amino-beta-Carboxymuconate-epsilon-Semialdehyde-Decarboxylase with Space Group of C2221 | ||||||||||||
![]() | 2-amino-3-carboxymuconate 6-semialdehyde decarboxylase | ||||||||||||
![]() | LYASE / Holo structure / decarboxylase | ||||||||||||
機能・相同性 | ![]() secondary metabolic process / : / : / carboxy-lyase activity / hydrolase activity / metal ion binding / cytosol 類似検索 - 分子機能 | ||||||||||||
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手法 | ![]() ![]() ![]() | ||||||||||||
![]() | Yang, Y. / Davis, I. / Matsui, T. / Rubalcava, I. / Liu, A. | ||||||||||||
資金援助 | ![]()
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![]() | ![]() タイトル: Quaternary structure of α-amino-β-carboxymuconate-ϵ-semialdehyde decarboxylase (ACMSD) controls its activity. 著者: Yu Yang / Ian Davis / Tsutomu Matsui / Ivan Rubalcava / Aimin Liu / ![]() 要旨: α-Amino-β-carboxymuconate-ϵ-semialdehyde decarboxylase (ACMSD) plays an important role in l-tryptophan degradation via the kynurenine pathway. ACMSD forms a homodimer and is functionally inactive ...α-Amino-β-carboxymuconate-ϵ-semialdehyde decarboxylase (ACMSD) plays an important role in l-tryptophan degradation via the kynurenine pathway. ACMSD forms a homodimer and is functionally inactive as a monomer because its catalytic assembly requires an arginine residue from a neighboring subunit. However, how the oligomeric state and self-association of ACMSD are controlled in solution remains unexplored. Here, we demonstrate that ACMSD from can self-assemble into homodimer, tetramer, and higher-order structures. Using size-exclusion chromatography coupled with small-angle X-ray scattering (SEC-SAXS) analysis, we investigated the ACMSD tetramer structure, and fitting the SAXS data with X-ray crystal structures of the monomeric component, we could generate a pseudo-atomic structure of the tetramer. This analysis revealed a tetramer model of ACMSD as a head-on dimer of dimers. We observed that the tetramer is catalytically more active than the dimer and is in equilibrium with the monomer and dimer. Substituting a critical residue of the dimer-dimer interface, His-110, altered the tetramer dissociation profile by increasing the higher-order oligomer portion in solution without changing the X-ray crystal structure. ACMSD self-association was affected by pH, ionic strength, and other electrostatic interactions. Alignment of ACMSD sequences revealed that His-110 is highly conserved in a few bacteria that utilize nitrobenzoic acid as a sole source of carbon and energy, suggesting a dedicated functional role of ACMSD's self-assembly into the tetrameric and higher-order structures. These results indicate that the dynamic oligomerization status potentially regulates ACMSD activity and that SEC-SAXS coupled with X-ray crystallography is a powerful tool for studying protein self-association. | ||||||||||||
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-関連構造データ
関連構造データ | ![]() 6mgtC ![]() 2hbvS S: 精密化の開始モデル C: 同じ文献を引用 ( |
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非結晶学的対称性 (NCS) | NCSドメイン:
NCSドメイン領域: Ens-ID: 1
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