Allosteric effects in the marginally stable von Hippel-Lindau tumor suppressor protein and allostery-based rescue mutant design

@article{citeulike:2368760, abstract = {Many multifunctional tumor suppressor proteins have low stability, a property linked to cancer development. The von HippelLindau tumor suppressor protein (pVHL) is one of these proteins. pVHL forms part of the E3 ubiquitin ligase complex that regulates the degradation of the hypoxia-inducible factor (HIF). Under native conditions, free pVHL is a molten globule, but it is stabilized in the E3 complex. By using molecular dynamics simulations, we observed that the interface between the two pVHL domains is the least stable region in unbound pVHL. We designed five stable mutants: one with a mutation at the interdomain interface and the others in the {alpha}- or -domains. Experimentally, type 2B pVHL disease mutant Y98N at the HIF binding site was shown to destabilize pVHL and decrease its binding affinity to HIF. Our simulations showed that the decrease in pVHL stability and binding affinity are allosterically regulated. The mutations designed to stabilize unbound wild-type pVHL, which are away from the elongin C and HIF binding sites, successfully stabilized the Y98N pVHLelongin C complex and lowered the binding free energy of pVHL with HIF. Our results indicated both the enthalpic and dynamic allosteric components between the elongin C and HIF binding sites in pVHL, in the {alpha}- and -domains, respectively, mediated by the interdomain interface and linker. Drugs mimicking the allosteric effects of these mutants may rescue pVHL function in von HippelLindau disease. 10.1073/pnas.0707401105}, author = {Liu, Jin and Nussinov, Ruth }, citeulike-article-id = {2368760}, doi = {10.1073/pnas.0707401105}, journal = {Proceedings of the National Academy of Sciences}, keywords = {allostery, design, fullatom, md, mutation}, month = {January}, number = {3}, pages = {901--906}, posted-at = {2008-02-13 07:31:01}, priority = {2}, title = {Allosteric effects in the marginally stable von Hippel-Lindau tumor suppressor protein and allostery-based rescue mutant design}, url = {http://dx.doi.org/10.1073/pnas.0707401105}, volume = {105}, year = {2008} }

TY - JOUR ID - citeulike:2368760 L3 - citeulike-article-id:2368760 TI - Allosteric effects in the marginally stable von Hippel-Lindau tumor suppressor protein and allostery-based rescue mutant design JF - Proceedings of the National Academy of Sciences VL - 105 IS - 3 SP - 901 EP - 906 N2 - Many multifunctional tumor suppressor proteins have low stability, a property linked to cancer development. The von HippelLindau tumor suppressor protein (pVHL) is one of these proteins. pVHL forms part of the E3 ubiquitin ligase complex that regulates the degradation of the hypoxia-inducible factor (HIF). Under native conditions, free pVHL is a molten globule, but it is stabilized in the E3 complex. By using molecular dynamics simulations, we observed that the interface between the two pVHL domains is the least stable region in unbound pVHL. We designed five stable mutants: one with a mutation at the interdomain interface and the others in the {alpha}- or -domains. Experimentally, type 2B pVHL disease mutant Y98N at the HIF binding site was shown to destabilize pVHL and decrease its binding affinity to HIF. Our simulations showed that the decrease in pVHL stability and binding affinity are allosterically regulated. The mutations designed to stabilize unbound wild-type pVHL, which are away from the elongin C and HIF binding sites, successfully stabilized the Y98N pVHLelongin C complex and lowered the binding free energy of pVHL with HIF. Our results indicated both the enthalpic and dynamic allosteric components between the elongin C and HIF binding sites in pVHL, in the {alpha}- and -domains, respectively, mediated by the interdomain interface and linker. Drugs mimicking the allosteric effects of these mutants may rescue pVHL function in von HippelLindau disease. 10.1073/pnas.0707401105 KW - allostery KW - design KW - fullatom KW - md KW - mutation AU - Liu, Jin AU - Nussinov, Ruth PY - 2008/01/22/ UR - http://dx.doi.org/10.1073/pnas.0707401105 ER -