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- W1750276522 abstract "Five virulent Agrobacterium spp. strains that can catabolize the mannityl opines mannopine (MOP), mannopinic acid ( MOA ), and agropinic acid (AGA) were tested for their ability to grow on analogs of these compounds. Analogs containing alternative amino acids replacing glutamic acid or glutamine were generally refused by these bacteria, but mutants were obtained that catabolized the entire family of analogs. In the case of strain C58C1 (pRi 8196), we demonstrated that typical mutants were constitutive for MOP uptake, whereas the wild-type parent was inducible by MOP. Analogs of MOA prepared from a variety of sugars instead of mannose were generally refused, except for a strain carrying pTi B6-806, which grew well on all such analogs. The analogs allowed selection of mutants of all strains. Although most wild-type strains were inducible for AGA uptake, typical mutants selected from strain C58C1 (pRi 8196) were found to be constitutive for uptake of AGA, as was the wild-type strain carrying pTi B6-806. Such constitutive mutants grew on all sugar analogs of MOP, MOA , and AGA tested. The pTi B6-806-containing strain was tested for growth on a more extended series of analogs, including tetrose , triose, diose , and disaccharide analogs, all of which were accepted. Only ketose analogs were refused. Selection of promiscuous regulatory mutants by the two types of opine analogs suggests that the repressor proteins of MOP and AGA permease/ catabolase systems are chiefly responsible for the specificity of the pathways." @default.
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- W1750276522 date "1984-05-01" @default.
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- W1750276522 title "Mannityl opine analogs allow isolation of catabolic pathway regulatory mutants" @default.
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- W1750276522 doi "https://doi.org/10.1128/jb.158.2.650-658.1984" @default.
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