A new cytochrome P450 belonging to the 107L subfamily is responsible for the efficient hydroxylation of the drug terfenadine by Streptomyces platensis.
Fexofenadine, an antihistamine drug used in allergic rhinitis treatment, can be produced by oxidative biotransformation of terfenadine by Streptomyces platensis, which involves three consecutive oxidation reactions. We report here the purification and identification of the enzyme responsible for the first step, a cytochrome P450 (P450)-dependent monooxygenase. The corresponding P450, designated P450(terf), was found to catalyze the hydroxylation of the t-butyl group of terfenadine and exhibited UV-Vis characteristics of a P450. Its interaction with terfenadine led to a shift of its Soret peak from 418 to 390 nm, as expected for the formation of a P450-substrate complex. In combination with spinach ferredoxin:NADP(+) oxidoreductase and ferredoxin, and in the presence of NADPH, it catalyzed the hydroxylation of terfenadine and some of its analogues, such as terfenadone and ebastine, with k(m) values at the μM level, and k(cat) values around 30min(-1). Sequencing of the p450(terf) gene led to a 1206 bp sequence, encoding for a 402 aminoacid polypeptide exhibiting 56-65% identity with the P450s from the 107L family. These results confirmed that P450s from Streptomyces species are interesting tools for the biotechnological production of secondary metabolites, such as antibiotics or antitumor compounds, and in the oxidative biotransformation of xenobiotics, such as drugs.
Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS UMR 8601, Université Paris Descartes, 45 rue des Saints-Pères, 75 270 Paris Cedex 06, France. murielle.lombard@parisdescartes.fr
Murielle
M
Lombard
Isabelle
I
Salard
Marie-Agnès
MA
Sari
Daniel
D
Mansuy
Didier
D
Buisson
D000595:Amino Acid Sequence; D003577:Cytochrome P-450 Enzyme System / Q000737:chemistry / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D006900:Hydroxylation; D042541:Intracellular Space / Q000201:enzymology / Q000378:metabolism; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D017422:Sequence Analysis, DNA; D013237:Stereoisomerism; D013302:Streptomyces / Q000166:cytology / Q000201:enzymology / Q000378:metabolism*; D013379:Substrate Specificity; D016593:Terfenadine / Q000737:chemistry / Q000378:metabolism*; D015262:Xenobiotics / Q000378:metabolism
D015262:Xenobiotics; D016593:Terfenadine; D003577:Cytochrome P-450 Enzyme System