Thermodynamics of cooperative DNA recognition at a replication origin and transcription regulatory site
Binding cooperativity guides the formation of protein-nucleic acid complexes, in particular those that are highly regulated such as replication origins and transcription sites. Using theDNAbinding domain of the origin binding and transcriptional regulator protein E2 from human papillomavirus type 16...
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2010
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00062960_v49_n48_p10277_Dellarole http://hdl.handle.net/20.500.12110/paper_00062960_v49_n48_p10277_Dellarole |
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| Sumario: | Binding cooperativity guides the formation of protein-nucleic acid complexes, in particular those that are highly regulated such as replication origins and transcription sites. Using theDNAbinding domain of the origin binding and transcriptional regulator protein E2 from human papillomavirus type 16 as model, and through isothermal titration calorimetry analysis, we determined a positive, entropy-driven cooperativity upon binding of the protein to its cognate tandem double E2 site. This cooperativity is associated with a change in DNA structure, where the overall B conformation is maintained. Two homologous E2 domains, those of HPV18 and HPV11, showed that the enthalpic-entropic components of the reaction and DNA deformation can diverge. Because the DNA binding helix is almost identical in the three domains, the differences must lie dispersed throughout this unique dimeric β-barrel fold. This is in surprising agreement with previous results for this domain, which revealed a strong coupling between global dynamics and DNA recognition. © 2010 American Chemical Society. |
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