New small polypeptides associated with DNA-dependent RNA polymerase of Escherichia coli after infection with bacteriophage T4 - PubMed (original) (raw)
New small polypeptides associated with DNA-dependent RNA polymerase of Escherichia coli after infection with bacteriophage T4
A Stevens. Proc Natl Acad Sci U S A. 1972 Mar.
Abstract
Four new small polypeptides are associated with DNA-dependent RNA polymerase from E. coli after infection with T4 phage. The new polypeptides are easily detected in RNA polymerase from E. coli cells labeled with amino acids after phage infection. Their molecular weights range from 10,000 to 22,000, as detected by polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate. All four polypeptides are found after infection with either wild-type T4 phage or T4 early amber mutants in genes 44, 42, 47, and 46. None of the polypeptides is labeled significantly before 5 min after infection at 30 degrees . When two maturation-defective amber mutants in gene 55 of T4 phage are used for infection, a polypeptide with a molecular weight of 22,000 is absent. When a maturation-defective amber mutant in gene 33 of T4 phage is used, another small protein is absent.
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