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Journal article
The transport of mannitol in Sinorhizobium meliloti is carried out by a broad-substrate polyol transporter SmoEFGK and is affected by the ability to transport and metabolize fructose
Microbiology (Society for General Microbiology), Vol.169(7), p.1371
2023
PMID: 37505890
Abstract
The smo locus (sorbitol mannitol oxidation) is found on the chromosome of S. meliloti’s tripartite genome. Mutations at the smo locus reduce or abolish the ability of the bacterium to grow on several carbon sources, including sorbitol, mannitol, galactitol, d-arabitol and maltitol. The contribution of the smo locus to the metabolism of these compounds has not been previously investigated. Genetic complementation of mutant strains revealed that smoS is responsible for growth on sorbitol and galactitol, while mtlK restores growth on mannitol and d-arabitol. Dehydrogenase assays demonstrate that SmoS and MtlK are NAD+-dependent dehydrogenases catalysing the oxidation of their specific substrates. Transport experiments using a radiolabeled substrate indicate that sorbitol, mannitol and d-arabitol are primarily transported into the cell by the ABC transporter encoded by smoEFGK. Additionally, it was found that a mutation in either frcK, which is found in an operon that encodes the fructose ABC transporter, or a mutation in frk, which encodes fructose kinase, leads to the induction of mannitol transport.
Details
- Title
- The transport of mannitol in Sinorhizobium meliloti is carried out by a broad-substrate polyol transporter SmoEFGK and is affected by the ability to transport and metabolize fructose
- Authors/Creators
- MacLean G. Kohlmeier - University of ManitobaIvan J. Oresnik - University of Manitoba
- Publication Details
- Microbiology (Society for General Microbiology), Vol.169(7), p.1371
- Publisher
- Microbiology Society
- Grant note
- RGPIN-2018-04966 / Natural Sciences and Engineering Research Council of Canada
- Identifiers
- 991005884943807891
- Copyright
- © 2023 The Authors
- Murdoch Affiliation
- Centre for Sustainable Farming Systems
- Language
- English
- Resource Type
- Journal article
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