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. 1992 Feb;174(4):1339–1344. doi: 10.1128/jb.174.4.1339-1344.1992

Effect of Escherichia coli nusG function on lambda N-mediated transcription antitermination.

S L Sullivan 1, D F Ward 1, M E Gottesman 1
PMCID: PMC206430  PMID: 1531224

Abstract

The Escherichia coli Nus factors act in conjunction with the bacteriophage lambda N protein to suppress transcription termination on the lambda chromosome. NusA binds both N and RNA polymerase and may also interact with other Nus factors. To search for additional components of the N antitermination system, we isolated host revertants that restored N activity in nusA1 mutants. One revertant, nusG4, was mapped to the rif region of the E. coli chromosome and shown to represent a point mutation near the 3' end of the nusG gene. The nusG4 mutation also suppressed nusE71 but not nusASal, nusB5, nusC60 (rpoB60), or nusD026 (rho026). However, nusG+ expressed from a multicopy plasmid suppressed nusD026 and related rho mutants for both lambda and phage T4 growth. These results suggest that NusG may act as a component of the N antitermination complex. In addition, the data imply a role for NusG in Rho-dependent termination.

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Selected References

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