期刊
JOURNAL OF MOLECULAR BIOLOGY
卷 394, 期 1, 页码 15-28出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmb.2009.08.075
关键词
temperate bacteriophage TP901-1; genetic switch; mixed feedback loop; sequestration; protein interaction
资金
- Danish National Research Foundation
The lytic-lysogenic switch of the temperate lactococcal phage TP901-1 is fundamentally different from that of phage lambda. In phage TP901-1, the lytic promoter P(L) is repressed by CI, whereas repression of the lysogenic promoter P(R) requires the presence of both of the antagonistic regulator proteins, MOR and Cl. We model the central part of the switch and compare the two cases for P(R) repression: the one where the two regulators interact only on the DNA and the other where the two regulators form a heteromer complex in the cytoplasm prior to DNA binding. The models are analyzed for bistabihty, and the predicted promoter repression folds are compared to experimental data. We conclude that the experimental data are best reproduced the latter case, where a heteromer complex forms in solution. We further find that Cl sequestration by the formation of MOR:CI complexes in cytoplasm makes the genetic switch robust. (C) 2009 Elsevier Ltd. All rights reserved.
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