Dataset Information

Cocrystallization and preliminary crystallographic analysis of an inactive MaoC-like hydratase mutant with the substrate crotonyl-CoA.

ABSTRACT: MaoC-like hydratase (MaoC) is a recently identified enzyme involved in the biosynthetic pathway of polyhydroxyalkanoates (PHAs), which are completely biodegradable polymers used to produce green plastics. The inactive mutant D194N-MaoC was crystallized in the presence of the substrate crotonyl-CoA. Crystals were grown in a number of conditions, but only those produced using 20%(v/v) ethylene glycol were suitable for structural studies. Data were collected to 2.10 Å resolution using X-radiation and the crystal belonged to the orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 81.40, b = 82.58, c = 123.99 Å.

SUBMITTER: Wang H

PROVIDER: S-EPMC3325826 | biostudies-literature | 2012 Apr

REPOSITORIES: biostudies-literature

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Cocrystallization and preliminary crystallographic analysis of an inactive MaoC-like hydratase mutant with the substrate crotonyl-CoA.

Wang Huizheng H Zhu Jie J Song Weiwei W Zhang Xiuguo X

Acta crystallographica. Section F, Structural biology and crystallization communications 20120328 Pt 4

MaoC-like hydratase (MaoC) is a recently identified enzyme involved in the biosynthetic pathway of polyhydroxyalkanoates (PHAs), which are completely biodegradable polymers used to produce green plastics. The inactive mutant D194N-MaoC was crystallized in the presence of the substrate crotonyl-CoA. Crystals were grown in a number of conditions, but only those produced using 20%(v/v) ethylene glycol were suitable for structural studies. Data were collected to 2.10 Å resolution using X-radiation a ...[more]

PMID: 22505426

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Project description:Autotrophic Crenarchaeota use two different cycles for carbon dioxide fixation. Members of the Sulfolobales use the 3-hydroxypropionate/4-hydroxybutyrate (HP/HB) cycle, whereas Desulfurococcales and Thermoproteales use the dicarboxylate/4-hydroxybutyrate cycle. While these two cycles differ in the carboxylation reactions resulting in the conversion of acetyl-CoA + 2 CO2 to succinyl-CoA, they have a common regeneration part in which succinyl-CoA is reconverted to two acetyl-CoA molecules. This common part includes crotonyl-CoA conversion to acetoacetyl-CoA, which has unequivocally been shown in Ignicoccus hospitalis (Desulfurococcales) and Pyrobaculum neutrophilus (Thermoproteales) to be catalyzed by a bifunctional crotonase/3-hydroxybutyryl-CoA dehydrogenase. It is a fusion protein consisting of an enoyl-CoA hydratase and a dehydrogenase domain. As the homologous bifunctional protein is present in Sulfolobales as well, its common functioning in the conversion of crotonyl-CoA to acetoacetyl-CoA was proposed. Here we show that a model autotrophic member of Sulfolobales, Metallosphaera sedula, possesses in addition to the bifunctional protein (Msed_0399) several separate genes coding for crotonyl-CoA hydratase and (S)-3-hydroxybutyryl-CoA dehydrogenase. Their genes were previously shown to be transcribed under autotrophic and mixotrophic conditions. The dehydrogenase Msed_1423 (and not the bifunctional protein Msed_0399) appears to be the main enzyme catalyzing the (S)-3-hydroxybutyryl-CoA dehydrogenase reaction. Homologs of this dehydrogenase are the only (S)-3-hydroxybutyryl-CoA dehydrogenases present in all autotrophic Sulfolobales, strengthening this conclusion. Two uncharacterized crotonase homologs present in M. sedula genome (Msed_0336 and Msed_0384) were heterologously produced and characterized. Both proteins were highly efficient crotonyl-CoA hydratases and may contribute (or be responsible) for the corresponding reaction in the HP/HB cycle in vivo.

Dataset Information

Cocrystallization and preliminary crystallographic analysis of an inactive MaoC-like hydratase mutant with the substrate crotonyl-CoA.

Publications

Cocrystallization and preliminary crystallographic analysis of an inactive MaoC-like hydratase mutant with the substrate crotonyl-CoA.

Similar Datasets

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