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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Mutator and antimutator effects of the bacteriophage P1 hot gene product.

The Hot (homolog of theta) protein of bacteriophage P1 can substitute for the Escherichia coli DNA polymerase III theta subunit, as evidenced by its stabilizing effect on certain dnaQ mutants that carry an unstable polymerase III epsilon proofreading subunit (antimutator effect). Here, we show that Hot can also cause an increase in the mutability of various E. coli strains (mutator effect). The hot mutator effect differs from the one caused by the lack of theta. Experiments using chimeric theta/Hot proteins containing various domains of Hot and theta along with a series of point mutants show that both N- and C-terminal parts of each protein are important for stabilizing the epsilon subunit. In contrast, the N-terminal part of Hot appears uniquely responsible for its mutator activity.[1]


  1. Mutator and antimutator effects of the bacteriophage P1 hot gene product. Chikova, A.K., Schaaper, R.M. J. Bacteriol. (2006) [Pubmed]
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