Send to

Choose Destination
See comment in PubMed Commons below
J Bacteriol. 1998 Jun;180(12):3245-9.

Appropriate expression of filamentous phage f1 DNA replication genes II and X requires RNase E-dependent processing and separate mRNAs.

Author information

Department of Biochemistry, Duke University Medical Center, Durham, North Carolina 27710, USA.


The products of in-frame overlapping genes II and X carried by the filamentous phage f1 genome are proteins with required but opposing functions in phage DNA replication. Their normal relative levels are important for continuous production of phage DNA without killing infected Escherichia coli hosts. Here we identify several factors responsible for determining the relative levels of pII and pX and that, if perturbed, alter the normal distribution of the phage DNA species in infected hosts. Translation of the two proteins is essentially relegated to separate mRNAs. The mRNAs encoding genes II and X are also differentially sensitive to cleavage dependent on rne, the gene encoding the only E. coli endo-RNase known to have a global role in mRNA stability. Whereas pII levels are limited at the level of mRNA stability, normal pX levels require transcription in sufficient amounts from the promoter for the smaller mRNA encoding only pX.

[Indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Support Center