Abstract:
:AbiV is an abortive infection protein that inhibits the lytic cycle of several virulent phages infecting Lactococcus lactis, while a mutation in the phage gene sav confers insensitivity to AbiV. In this study, we have further characterized the effects of the bacterial AbiV and its interaction with the phage p2 protein SaV. First, we showed that during phage infection of lactococcal AbiV(+) cells, AbiV rapidly inhibited protein synthesis. Among early phage transcripts, sav gene transcription was slightly inhibited while the SaV protein could not be detected. Analyses of other phage p2 mRNAs and proteins suggested that AbiV blocks the activation of late gene transcription, probably by a general inhibition of translation. Using size exclusion chromatography coupled with on-line static light scattering and refractometry, as well as fluorescence quenching experiments, we also demonstrated that both AbiV and SaV formed homodimers and that they strongly and specifically interact with each other to form a stable protein complex.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Haaber J,Samson JE,Labrie SJ,Campanacci V,Cambillau C,Moineau S,Hammer Kdoi
10.1128/AEM.00093-10subject
Has Abstractpub_date
2010-11-01 00:00:00pages
7085-92issue
21eissn
0099-2240issn
1098-5336pii
AEM.00093-10journal_volume
76pub_type
杂志文章abstract::[This corrects the article on p. 118 in vol. 43.]. ...
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