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GENETIC ANALYSIS OF REGULATORY MUTANTS OF ALKALINE PHOSPHATASE OF E. COLI
Kenneth Kreuzer 1, Charles Pratt 1, and Annamaria Torriani 1
1 Department of Biology, Massachusetts Institute of Technology,
Cambridge, Massachusetts 02139
A fine structure map of the phoR region of E. coli , mutations of which affect the rate of alkaline phosphatase synthesis, was constructed by Hfr x F- crosses. Mutations causing three different phenotypes (previously reported as phoRa, phoRb, phoRc (Garen and Echols 1962a, b)) are clustered in three closely linked genetic loci. PhoR mutants of all three types, including the phoRb type not previously tested, are recessive to wild-type phoR+. In addition, phoRa and phoRc complement each other, while phoRa and phoRb do not. Our results support the hypothesis of Morris et al. (1974) that phoRc mutants represent a cistron (phoB) different from phoR.
Submitted on April 4, 1975Revised on June 16, 1975
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