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family:comment |
This family consists of several ROS/MUCR transcriptionalregulator proteins. The ros chromosomal gene is present in octopine and nopaline strains of Agrobacterium tumefaciens as well as in Rhizobium meliloti. This gene encodes a 15.5-kDa protein that specifically represses the virC and virD operons in the virulence region of the Ti plasmid [1] and is necessary for succinoglycan production [2]. Sinorhizobium meliloti can produce two types of acidic exopolysaccharides, succinoglycan and galactoglucan, that are interchangeable for infection of alfalfa nodules. MucR from Sinorhizobium meliloti acts as a transcriptional repressor that blocks the expression of the exp genes responsible for galactoglucan production therefore allowing the exclusive production of succinoglycan [3].
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