An organic O donor for biological hydroxylation reactions.
Proc Natl Acad Sci U S A
; 121(13): e2321242121, 2024 Mar 26.
Article
em En
| MEDLINE
| ID: mdl-38507448
ABSTRACT
All biological hydroxylation reactions are thought to derive the oxygen atom from one of three inorganic oxygen donors, O2, H2O2, or H2O. Here, we have identified the organic compound prephenate as the oxygen donor for the three hydroxylation steps of the O2-independent biosynthetic pathway of ubiquinone, a widely distributed lipid coenzyme. Prephenate is an intermediate in the aromatic amino acid pathway and genetic experiments showed that it is essential for ubiquinone biosynthesis in Escherichia coli under anaerobic conditions. Metabolic labeling experiments with 18O-shikimate, a precursor of prephenate, demonstrated the incorporation of 18O atoms into ubiquinone. The role of specific iron-sulfur enzymes belonging to the widespread U32 protein family is discussed. Prephenate-dependent hydroxylation reactions represent a unique biochemical strategy for adaptation to anaerobic environments.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Ubiquinona
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Ácidos Cicloexanocarboxílicos
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Escherichia coli
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Cicloexenos
Idioma:
En
Ano de publicação:
2024
Tipo de documento:
Article