Departmental Colloquium: Huan-Xiang Zhou
"Automated Prediction of Protein-Protein Association Rate Constants"
Abstract: Protein-protein association rate constants are a fundamental biophysical property and are essential parameters in systems biology. We developed a transient-complex theory for protein association , which predicts the rate constant as ka = ka0 exp(–Gel*/kBT), where ka0 is the “basal” rate constant for reaching the transient complex via random diffusion, and Gel* is the electrostatic interaction energy in the transient complex. In the transient complex, the two proteins have near-native separation and relative orientation but have yet to form specific interactions of the native complex. The predictive power of the theory was demonstrated over many protein-protein and protein-RNA complexes [1-4]. With further recent development, the methodology has now provided a solution to half of the protein association problem. The remaining half, where conformational rearrangement of the proteins is essential for their association, is the focus of our current studies. The calculated association rate constants and association mechanisms provide essential information for kinetic characterization of protein association.
 R. Alsallaq and H.-X. Zhou (2008) Proteins 71, 320-335.
 S. Qin and H.-X. Zhou (2008) J. Phys. Chem. B 112, 5955-5960.
 S. Qin and H.-X. Zhou (2009) Proc. Natl. Acad. Sci. USA 106, 6974-7979.
 X.Pang, S. Qin, and H.-X. Zhou (2011) Biophys. J. 101, 1175-1183.
Refreshments will be moved to the High Bay conference room 2620 and will be served at 2:30pm