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New Rifampin-Resistant Mutant of Escherichia coli

^a Department of Biology, Brandeis University, Waltham, Massachusetts 02154, Section on Intermediary Metabolism, Laboratory of Molecular Aging, Gerontology Research Center, National Institute of Child Health and Human Development, Bethesda, Maryland 20014, and the Baltimore City Hospitals, Baltimore, Maryland 21224.

ABSTRACT

A rifampin-resistant ribonucleic acid (RNA) polymerase mutant, rif^r51, derived from a presumptive RNA synthesis mutant of Escherichia coli K-12, complements rif^r RNA polymerase mutants isolated from other strains of E. coli K-12.

¹ Present address: Gerontology Research Center, Baltimore City Hospitals, Baltimore, Md. 21224.