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Appl Environ Microbiol, April 1998, p. 1175-1179, Vol. 64, No. 4
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Alkane Hydroxylase from Acinetobacter sp. Strain ADP1 Is Encoded by alkM and Belongs to a New Family of Bacterial Integral-Membrane Hydrocarbon Hydroxylases

Andreas Ratajczak, Walter Geißdörfer, and Wolfgang Hillen*

Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Received 17 November 1997/Accepted 2 January 1998

Degradation of long-chain alkanes by Acinetobacter sp. strain ADP1 involves rubredoxin and rubredoxin reductase. We complemented a mutant deficient in alkane utilization and sequenced four open reading frames (ORFs) on the complementing DNA. Each of these ORFs was disrupted by insertional mutagenesis on the chromosome. As determined from sequence comparisons, ORF1 and ORF4 seem to encode a rotamase of the PpiC type and an acyl coenzyme A dehydrogenase, respectively. Disruption of these ORFs does not affect alkane utilization. In contrast, the two other ORFs, alkR and alkM, are essential for growth on alkanes as sole carbon sources. alkR encodes a polypeptide with extensive homology to AraC-XylS-like transcriptional regulators. It is located next to alkM, which encodes the terminal alkane hydroxylase, but is in the opposite orientation. Sequence homologies with other bacterial integral-membrane hydrocarbon hydroxylases suggest that AlkM may be the first member of a new protein family. The genes identified here are not linked to the rubredoxin- and rubredoxin reductase-encoding genes on the Acinetobacter sp. strain ADP1 chromosome.

* Corresponding author. Mailing address: Lehrstuhl für Mikrobiologie, Institut für Mikrobiologie, Biochemie und Genetik der Friedrich-Alexander-Universität Erlangen-Nürnberg, Staudtstrasse 5, 91058 Erlangen, Germany. Phone: 49 (9131) 858081. Fax: 49 (9131) 858082. E-mail: whillen{at}biologie.uni-erlangen.de.




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