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Phenotype of a Rhizobium leguminosarum ntrC mutant (Articolo in rivista)

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Phenotype of a Rhizobium leguminosarum ntrC mutant (Articolo in rivista) (literal)

Anno

Alternative label

Moreno, S., Patricarca, E., Chiurazzi, M., Meza, R., Defez, R., Iaccarino, M., and Espin, G. (1992)
Phenotype of a Rhizobium leguminosarum ntrC mutant
in Research in microbiology (Paris); Elsevier, Paris (Francia)
(literal)

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Moreno, S., Patricarca, E., Chiurazzi, M., Meza, R., Defez, R., Iaccarino, M., and Espin, G. (literal)

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Unidad de Biologia Molecular y Biotecnologia Vegetal, U.N.A.M., Apdo, Postal 565-A, Cuernavaca, Morelos, Mexico Istituto Internazionale di Genetica e Biofisica, CNR, Via G. Marconi 10, 80125 Naples, Italy (literal)

Titolo

Abstract

A Tn5 insertion mutant, strain CFN2012, of Rhizobium leguminosarum biovar phaseoli devoid of glutamine synthetase II (GSII) activity was analysed. It was shown to contain Tn5 within an 11-kb BamHI DNA fragment, which was isolated (pSM261) from the wild-type strain and, when introduced into strain CFN2012, was shown to complement the absence of GSII activity. The DNA sequence of the corresponding region from the wild-type allele revealed the presence of an ntrC regulatory gene, and restriction analysis indicated that the mutant allele carried the Tn5 insertion within it. Further analysis of strain CFN2012 indicated that this mutant has reduced levels of the PII regulatory protein and that, in contrast to ntrC mutants of other Rhizobiaceae, it grows on nitrate as the sole nitrogen source. (literal)

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