A specificity switch in selected cre recombinase variants is mediated by macromolecular plasticity and water.Baldwin, E.P., Martin, S.S., Abel, J., Gelato, K.A., Kim, H., Schultz, P.G., Santoro, S.W.
(2003) Chem.Biol. 10: 1085-1094
- PubMed: 14652076
- Primary Citation of Related Structures:
- PubMed Abstract:
- The order of strand exchanges in Cre-LoxP recombination and its basis suggested by the crystal structure of a Cre-LoxP Holliday junction complex.
Martin, S.S.,Pulido, E.,Chu, V.C.,Lechner, T.S.,Baldwin, E.P.
(2002) J.Mol.Biol. 319: 107
- Modulation of the active complex assembly and turnover rate by protein-DNA interactions in Cre-LoxP recombination.
Martin, S.S.,Chu, V.C.,Baldwin, E.
(2003) Biochemistry 42: 6814
- Directed evolution of the site specificity of Cre recombinase.
Santoro, S.W.,Schultz, P.G.
(2002) Proc.Natl.Acad.Sci.USA 99: 4185
The basis for the altered DNA specificities of two Cre recombinase variants, obtained by mutation and selection, was revealed by their cocrystal structures. The proteins share similar substitutions but differ in their preferences for the natural LoxP ...
The basis for the altered DNA specificities of two Cre recombinase variants, obtained by mutation and selection, was revealed by their cocrystal structures. The proteins share similar substitutions but differ in their preferences for the natural LoxP substrate and an engineered substrate that is inactive with wild-type Cre, LoxM7. One variant preferentially recombines LoxM7 and contacts the substituted bases through a hydrated network of novel interlocking protein-DNA contacts. The other variant recognizes both LoxP and LoxM7 utilizing the same DNA backbone contact but different base contacts, facilitated by an unexpected DNA shift. Assisted by water, novel interaction networks can arise from few protein substitutions, suggesting how new DNA binding specificities might evolve. The contributions of macromolecular plasticity and water networks in specific DNA recognition observed here present a challenge for predictive schemes.
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