PMID:6102983: Difference between revisions

Revision as of 19:30, 1 September 2013

Citation	Felton, J, Michaelis, S and Wright, A (1980) Mutations in two unlinked genes are required to produce asparagine auxotrophy in Escherichia coli.J. Bacteriol. 142:221-8
Abstract	Escherichia coli K-12 has two genes, asnA+ and asnB+, either one of which is able to satisfy the need of cells for asparagine. In order for a strain to have an auxotrophic requirement for asparagine, both genes must be mutationally inactivated. We obtained mutants with Tn5 inserted in asnB. asnB was mapped by conjugation and by three-factor P1 transductions at 15 min on the E coli K-12 linkage map, between ubiF and nagB. Specialized transducing phage lamba 781 supE was shown to carry asnB, as well as supE, ubiF, nagA, and nagB. asnA is the previously mapped ilv-linked asn locus, whiich is between uncB and rbs. E. coli C also has two asn genes, corresponding to asnA and asnB.
Links	PubMed
Keywords	Aspartate-Ammonia Ligase; Chromosome Mapping; Chromosomes, Bacterial; Conjugation, Genetic; DNA Transposable Elements; Escherichia coli; Genes; Genetic Linkage; Ligases; Mutation; Transduction, Genetic
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