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Cloning and sequencing of some genes responsible for porphyrin biosynthesis from the anaerobic bacterium Clostridium josui.

J. Bacteriol.1995 Sep;177(17):5169-75. doi:10.1128/jb.177.17.5169-5175.1995
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摘要


The 6.2-kbp DNA fragment encoding the enzymes in the porphyrin synthesis pathway of a cellulolytic anaerobe, Clostridium josui, was cloned into Escherichia coli and sequenced. This fragment contained four hem genes, hemA, hemC, hemD, and hemB, in order, which were homologous to the corresponding genes from E. coli and Bacillus subtilis. A typical promoter sequence was found only upstream of hemA, suggesting that these four genes were under the control of this promoter as an operon. The hemA and hemD genes cloned from C. josui were able to complement the hemA and hemD mutations, respectively, of E. coli. The COOH-terminal region of C. josui HemA and the NH2-terminal region of C. josui HemD were homologous to E. coli CysG (Met-1 to Leu-151) and to E. coli CysG (Asp-213 to Phe-454) and Pseudomonas denitrificans CobA, respectively. Furthermore, the cloned 6.2-kbp DNA fragment complemented E. coli cysG mutants. These results suggested that both C. josui hemA and hemD encode bifunctional enzymes.

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