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Microbiology (2002), 148, 3079-3087.
© 2002 Society for General Microbiology

Molecular Genetics and Immunobiology of Mycobacteria

Modification of glycopeptidolipids by an O-methyltransferase of Mycobacterium smegmatisa

Dharshini Jeevarajah1, John H. Patterson2, Malcolm J. McConville2 and Helen Billman-Jacobe1

Departments of Microbiology and Immunology1, and Biochemistry and Molecular Biology2, University of Melbourne, Victoria 3010, Australia

Author for correspondence: Helen Billman-Jacobe. Tel: +61 3 8344 5698. Fax: +61 3 9347 1540. e-mail: hbj{at}unimelb.edu.au

Glycopeptidolipids (GPLs) are a major component of the outer layers of the cell walls of several non-tuberculous mycobacteria. The Mycobacterium smegmatis GPLs consist of a diglycosylated lipopeptide core which is variably modified by acetylation and methylation. Analysis of a region of the M. smegmatis chromosome, upstream of the peptide synthetase gene, mps, revealed a GPL biosynthetic locus containing genes potentially involved in glycosylation, methylation, acetylation and transport of GPLs. Methyltransferases are required to modify rhamnose and the fatty acid of GPLs. Of the four methyltransferases encoded within the locus, one methyltransferase, Mtf2, was unlike sugar methyltransferases from other species. An mtf2 mutant was created and was shown to be unable to methylate the GPL fatty acids. Direct evidence is presented that Mtf2 is a methyltransferase that modifies the GPL fatty acid.

Keywords: GPL, mycobacteria, methylation

Abbreviations: DIG, digoxigenin; ESI-MS, electrospray ionization mass spectrometry; GPL, glycopeptidolipid; HPTLC, high-performance thin-layer chromatography

a The GenBank accession number for the sequence determined in this work is AY138899.




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