Cell growth and lambda phage development controlled by the same essential Escherichia coli gene, ftsH/hflB.
The lambda phage choice between lysis and lysogeny is influenced by certain host functions in Escherichia coli. We found that the frequency of lambda lysogenization is markedly increased in the ftsH1 temperature-sensitive mutant. The ftsH gene, previously shown to code for an essential inner membrane protein with putative ATPase activity, is identical to hflB, a gene involved in the stability of the phage cII activator protein. The lysogenic decision controlled by FtsH/HflB is independent of that controlled by the protease HflA. Overproduction of FtsH/HflB suppresses the high frequency of lysogenization in an hflA null mutant. The FtsH/HflB protein, which stimulates cII degradation, may be a component of an HflA-independent proteolytic pathway, or it may act as a chaperone, maintaining cII in a conformation subject to proteolysis via such a pathway. Suppressor mutations of ftsH1 temperature-sensitive lethality, located in the fur gene (coding for the ferric uptake regulator), did not restore FtsH/HflB activity with respect to lambda lysogenization.
Herman
C
C
Institut Jacques Monod (Centre National de la Recherche Scientifique, Université Paris 7), France.
Ogura
T
T
Tomoyasu
T
T
Hiraga
S
S
Akiyama
Y
Y
Ito
K
K
Thomas
R
R
D'Ari
R
R
Bouloc
P
P
D049069:ATP-Dependent Proteases; D001426:Bacterial Proteins / Q000378:metabolism / Q000502:physiology; D010582:Bacteriophage lambda / Q000254:growth & development*; D002455:Cell Division; D003001:Cloning, Molecular; D010450:Endopeptidases / Q000502:physiology; D004926:Escherichia coli / Q000254:growth & development*; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D008242:Lysogeny; D008565:Membrane Proteins / Q000378:metabolism; D010641:Phenotype; D012097:Repressor Proteins / Q000502:physiology; D014157:Transcription Factors / Q000378:metabolism; D014764:Viral Proteins
D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; D008565:Membrane Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; D014764:Viral Proteins; C039000:cII protein, bacteriophage lambda; C068477:ferric uptake regulating proteins, bacterial; D010450:Endopeptidases; D049069:ATP-Dependent Proteases; C513383:FtsH protein, E coli