- Escherichia coli rpoC397 encodes a temperature-sensitive C-terminal frameshift in the beta' subunit of RNA polymerase that blocks growth of bacteriophage P2. Christie, G.E., Cale, S.B., Isaksson, L.A., Jin, D.J., Xu, M., Sauer, B., Calendar, R. J. Bacteriol. (1996)