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Journal of Bacteriology, May 2003, p. 3232-3237, Vol. 185, No. 10
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.10.3232-3237.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Differential Expression of the Components of the Two Alkane Hydroxylases from Pseudomonas aeruginosa

Departamento de Biotecnología Microbiana, Centro Nacional de Biotecnología, CSIC, Campus de la Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain

Received 9 January 2003/ Accepted 26 February 2003

Oxidation of n-alkanes in bacteria is normally initiated by an enzyme system formed by a membrane-bound alkane hydroxylase and two soluble proteins, rubredoxin and rubredoxin reductase. Pseudomonas aeruginosa strains PAO1 and RR1 contain genes encoding two alkane hydroxylases (alkB1 and alkB2), two rubredoxins (alkG1 and alkG2), and a rubredoxin reductase (alkT). We have localized the promoters for these genes and analyzed their expression under different conditions. The alkB1 and alkB2 genes were preferentially expressed at different moments of the growth phase; expression of alkB2 was highest during the early exponential phase, while alkB1 was induced at the late exponential phase, when the growth rate decreased. Both genes were induced by C₁₀ to C₂₂/C₂₄ alkanes but not by their oxidation derivatives. However, the alkG1, alkG2, and alkT genes were expressed at constant levels in both the absence and presence of alkanes.

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