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Applied and Environmental Microbiology, January 2006, p. 276-283, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.276-283.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Identification, Mutagenesis, and Transcriptional Analysis of the Methanesulfonate Transport Operon of Methylosulfonomonas methylovora

Mohammed Jamshad,1 Paolo De Marco,2 Catarina C. Pacheco,2 Timea Hanczar,2,3 and J. Colin Murrell1*

Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom,1 Cell and Applied Microbiology, IBMC, Universidade do Porto R. Campo Alegre, 823, 4150-180 Porto, Portugal,2 Department of Biotechnology, University of Szeged, Temesvari krt. 62, 6726 Szeged, Hungary3

Received 3 June 2005/ Accepted 23 September 2005

Recently identified genes located downstream (3') of the msmEF (transport encoding) gene cluster, msmGH, and located 5' of the structural genes for methanesulfonate monooxygenase (MSAMO) are described from Methylosulfonomonas methylovora. Sequence analysis of the derived polypeptide sequences encoded by these genes revealed a high degree of identity to ABC-type transporters. MsmE showed similarity to a putative periplasmic substrate binding protein, MsmF resembled an integral membrane-associated protein, and MsmG was a putative ATP-binding enzyme. MsmH was thought to be the cognate permease component of the sulfonate transport system. The close association of these putative transport genes to the MSAMO structural genes msmABCD suggested a role for these genes in transport of methanesulfonic acid (MSA) into M. methylovora. msmEFGH and msmABCD constituted two operons for the coordinated expression of MSAMO and the MSA transporter systems. Reverse-transcription-PCR analysis of msmABCD and msmEFGH revealed differential expression of these genes during growth on MSA and methanol. The msmEFGH operon was constitutively expressed, whereas MSA induced expression of msmABCD. A mutant defective in msmE had considerably slower growth rates than the wild type, thus supporting the proposed role of MsmE in the transport of MSA into M. methylovora.

* Corresponding author. Mailing address: Department of Biological Sciences, University of Warwick, Coventry CV4 7AL, United Kingdom. Phone: 44 24 76 523553. Fax: 44 24 76 523568. E-mail: J.C.Murrell{at}warwick.ac.uk

Applied and Environmental Microbiology, January 2006, p. 276-283, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.276-283.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.





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