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. 1993 Sep;175(18):6028–6037. doi: 10.1128/jb.175.18.6028-6037.1993

Cloning and expression of a member of a new cytochrome P-450 family: cytochrome P-450lin (CYP111) from Pseudomonas incognita.

J D Ropp 1, I C Gunsalus 1, S G Sligar 1
PMCID: PMC206685  PMID: 8376348

Abstract

Cytochrome P-450lin catalyzes the 8-methyl hydroxylation of linalool as the first committed step of its utilization by Pseudomonas incognita as the sole carbon source. By using a polymerase chain reaction-based cloning strategy, a 2.1-kb DNA fragment containing the cytochrome P-450lin gene (linC) was isolated. An open reading frame of 406 amino acids has been identified as that of P-450lin on the basis of amino acid sequence data from peptides of the native protein. Heterologous expression of functional holoprotein is exhibited by Escherichia coli transformed with pUC18 containing the subcloned linC gene under constitutive transcriptional control of the lac promoter. The G+C content of linC was found to be 55% overall and 58% in the third codon position. An optimized amino acid sequence alignment of P-450lin with cytochrome P-450cam shows that the two enzymes have only 25% identity. P-450lin was found to exhibit the expected conservation in the axial cysteine heme ligand-containing peptide and the threonine region postulated to form an O2-binding pocket (T. L. Poulos, B. C. Finzel, and A. J. Howard, J. Mol. Biol. 195:687-700, 1987). The low amino acid sequence identity between P-450lin and all other P-450 sequences has shown that P-450lin is the first member of the CYP111 P-450 gene family.

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Selected References

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