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The methanogenic archaeon Methanosarcina mazei Gö1 accumulates glycine betaine in response to hypersalinity but differs from most other methanoarchaea in having two gene clusters both encoding a potential glycine betaine transporter, Ota and Otb. We have created mutants with either ota or otb deleted to address their role in salt adaptation. The mutants were not impaired in growth at low or high salt, neither at 37 degrees C nor at lower temperatures. However, the Deltaota mutant was completely defective in glycine betaine transport demonstrating that Ota is the only glycine betaine transporter in M. mazei. The mutation in otb led to increased transcription of ota and thus increased transport and accumulation of glycine betaine suggesting a cross talk between the two transporters.


Regina Saum, Ana Mingote, Helena Santos, Volker Müller. Genetic analysis of the role of the ABC transporter Ota and Otb in glycine betaine transport in Methanosarcina mazei Gö1. Archives of microbiology. 2009 Apr;191(4):291-301

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PMID: 19096827

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