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1985 (1)
1Author    A. P. Singh, J. B. SinghRequires cookie*
 Title    Regulation of ß-Galactosidase Synthesis in Wild Type and in a Succinate-Resistant Mutant of Rhizobium meliloti  
 Abstract    The synthesis o f /?-galactosidase in Rhizobium m eliloti W U 60 was found to be inducible by lactose and its non-m etabolizable analogue, isopropyl-ß-D-thiogalactoside (IPTG). In contrast to Escherichia coli, galactose and m elibiose were very weak inducers o f this enzyme in R. meliloti. The maximum level o f /3-galactosidase in this bacterium is 2% o f that in fully induced E. coli. In addition to glucose, the induced synthesis o f this enzyme in R. m eliloti was repressed by galactose, glycerol, and succinate. In comparison to E. coli, addition o f cyclic AMP to the growth medium o f R. m eliloti did not alleviate the repressive effect o f the above com pounds on ß-galactosidase synthesis. High concentrations o f sodium succinate (100 m M) were inhibitory to the growth o f R. meliloti. Spontaneous succinate-resistant mutants could be isolated at low frequency. In contrast to the wild type parent, in a succinate-resistant mutant, the synthesis o f /J-galactosidase was not repressed by succinate. 
  Reference    Z. Naturforsch. 40c, 170—175 (1985); received October 3 1984 
  Published    1985 
  Keywords    /3-Galactosidase, Rhizobium meliloti, Enzyme Induction, Catabolite Repression, Succinate-Resistant Mutant 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0170.pdf 
 Identifier    ZNC-1985-40c-0170 
 Volume    40