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Journal of Bacteriology, April 2002, p. 1916-1924, Vol. 184, No. 7
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.7.1916-1924.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Two Distinct Alcohol Dehydrogenases Participate in Butane Metabolism by Pseudomonas butanovora

Alisa S. Vangnai,1 Daniel J. Arp,2 and Luis A. Sayavedra-Soto2*

Department of Biochemistry and Biophysics,1 Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon 97331-29022

Received 2 November 2001/ Accepted 11 January 2002

The involvement of two primary alcohol dehydrogenases, BDH and BOH, in butane utilization in Pseudomonas butanovora (ATCC 43655) was demonstrated. The genes coding for BOH and BDH were isolated and characterized. The deduced amino acid sequence of BOH suggests a 67-kDa alcohol dehydrogenase containing pyrroloquinoline quinone (PQQ) as cofactor and in the periplasm (29-residue leader sequence). The deduced amino acid sequence of BDH is consistent with a 70.9-kDa, soluble, periplasmic (37-residue leader sequence) alcohol dehydrogenase containing PQQ and heme c as cofactors. BOH and BDH mRNAs were induced whenever the cell's 1-butanol oxidation activity was induced. When induced with butane, the gene for BOH was expressed earlier than the gene for BDH. Insertional disruption of bdh or boh affected adversely, but did not eliminate, butane utilization by P. butanovora. The P. butanovora mutant with both genes boh and bdh inactivated was unable to grow on butane or 1-butanol. These cells, when grown in citrate and incubated in butane, developed butane oxidation capability and accumulated 1-butanol. The enzyme activity of BOH was characterized in cell extracts of the P. butanovora strain with bdh disrupted. Unlike BDH, BOH oxidized 2-butanol. The results support the involvement of two distinct NAD+-independent, PQQ-containing alcohol dehydrogenases, BOH (a quinoprotein) and BDH (a quinohemoprotein), in the butane oxidation pathway of P. butanovora.

* Corresponding author. Mailing address: Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331-2902. Phone: (541) 737-5285. Fax: (541) 737-5310. E-mail: sayavedl{at}bcc.orst.edu.

Journal of Bacteriology, April 2002, p. 1916-1924, Vol. 184, No. 7
0021-9193/02/$04.00+0     DOI: 10.1128/JB.184.7.1916-1924.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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