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Biotransformation using alkane-oxidizing bacteria or their alkane hydroxylase (AH) systems have been little studied at the molecular level. We have cloned and sequenced genes from Gordonia sp. TF6 encoding an AH system, alkB2 (alkane 1-monooxygenase), rubA3 (rubredoxin), rubA4 (rubredoxin), and rubB (rubredoxin reductase). When expressed in Escherichia coli, these genes allowed the construction of biotransformation systems for various alkanes. Normal alkanes with 5 to 13 carbons were good substrates for this biotransformation, and oxidized to their corresponding 1-alkanols. Surprisingly, cycloalkanes with 5 to 8 carbons were oxidized to their corresponding cycloalkanols as well. This is the first study to achieve biotransformation of alkanes using the E. coli expressing the minimum component genes of the AH system. Our biotransformation system has facilitated assays and analysis leading to improvement of AH systems, and has indicated a cycloalkane oxidation pathway in microorganisms for the first time.

Biotransformation of Various Alkanes Using theEscherichia coliExpressing an Alkane Hydroxylase System fromGordoniasp. TF6