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Thermodynamics of denaturation of complexes of barnase and binase with barstar
Authors:Mitkevich Vladimir A  Schulga Alexey A  Ermolyuk Yaroslav S  Lobachov Vladimir M  Chekhov Vladimir O  Yakovlev Gennady I  Hartley Robert W  Nick Pace C  Kirpichnikov Mikhail P  Makarov Alexander A
Affiliation:Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Vavilov str 32, Moscow 119991, Russia.
Abstract:Differential scanning calorimetry was used to study the thermodynamics of denaturation of protein complexes for which the free energy stabilizing the complexes varied between -8 and -16 kcal/mol. The proteins studied were the ribonucleases barnase and binase, their inhibitor barstar and mutants thereof, and complexes between the two. The results are in good agreement with the model developed by Brandts and Lin for studying the thermodynamics of denaturation for tight complexes between two proteins which undergo two-state thermal unfolding transitions.
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