Community-wide assessment of protein-interface modeling suggests improvements to design methodology.

TitleCommunity-wide assessment of protein-interface modeling suggests improvements to design methodology.
Publication TypeJournal Article
Year of Publication2011
AuthorsFleishman, S. J., T. A. Whitehead, E-M. Strauch, J. E. Corn, S. Qin, H-X. Zhou, J. C. Mitchell, O. N. A. Demerdash, M. Takeda-Shitaka, G. Terashi, I. H. Moal, X. Li, P. A. Bates, M. Zacharias, H. Park, J-su. Ko, H. Lee, C. Seok, T. Bourquard, J. Bernauer, A. Poupon, J. Azé, S. Soner, S. Kerem Ovali, P. Ozbek, N. Ben Tal, T. Haliloglu, H. Hwang, T. Vreven, B. G. Pierce, Z. Weng, L. Pérez-Cano, C. Pons, J. Fernández-Recio, F. Jiang, F. Yang, X. Gong, L. Cao, X. Xu, B. Liu, P. Wang, C. Li, C. Wang, C. H. Robert, M. Guharoy, S. Liu, Y. Huang, L. Li, D. Guo, Y. Chen, Y. Xiao, N. London, Z. Itzhaki, O. Schueler-Furman, Y. Inbar, V. Potapov, M. Cohen, G. Schreiber, Y. Tsuchiya, E. Kanamori, D. M. Standley, H. Nakamura, K. Kinoshita, C. M. Driggers, R. G. Hall, J. L. Morgan, V. L. Hsu, J. Zhan, Y. Yang, Y. Zhou, P. L. Kastritis, A. M. J. J. Bonvin, W. Zhang, C. J. Camacho, K. P. Kilambi, A. Sircar, J. J. Gray, M. Ohue, N. Uchikoga, Y. Matsuzaki, T. Ishida, Y. Akiyama, R. Khashan, S. Bush, D. Fouches, A. Tropsha, J. Esquivel-Rodríguez, D. Kihara, B. P Stranges, R. Jacak, B. Kuhlman, S-Y. Huang, X. Zou, S. J. Wodak, J. Janin, and D. Baker
JournalJ Mol Biol
Volume414
Issue2
Pagination289-302
Date Published2011 Nov 25
ISSN1089-8638
KeywordsBinding Sites, Models, Molecular, Protein Binding, Proteins
Abstract

The CAPRI (Critical Assessment of Predicted Interactions) and CASP (Critical Assessment of protein Structure Prediction) experiments have demonstrated the power of community-wide tests of methodology in assessing the current state of the art and spurring progress in the very challenging areas of protein docking and structure prediction. We sought to bring the power of community-wide experiments to bear on a very challenging protein design problem that provides a complementary but equally fundamental test of current understanding of protein-binding thermodynamics. We have generated a number of designed protein-protein interfaces with very favorable computed binding energies but which do not appear to be formed in experiments, suggesting that there may be important physical chemistry missing in the energy calculations. A total of 28 research groups took up the challenge of determining what is missing: we provided structures of 87 designed complexes and 120 naturally occurring complexes and asked participants to identify energetic contributions and/or structural features that distinguish between the two sets. The community found that electrostatics and solvation terms partially distinguish the designs from the natural complexes, largely due to the nonpolar character of the designed interactions. Beyond this polarity difference, the community found that the designed binding surfaces were, on average, structurally less embedded in the designed monomers, suggesting that backbone conformational rigidity at the designed surface is important for realization of the designed function. These results can be used to improve computational design strategies, but there is still much to be learned; for example, one designed complex, which does form in experiments, was classified by all metrics as a nonbinder.

DOI10.1016/j.jmb.2011.09.031
Alternate JournalJ. Mol. Biol.
PubMed ID22001016
PubMed Central IDPMC3839241
Grant ListP41 RR011823 / RR / NCRR NIH HHS / United States
R01 GM073960 / GM / NIGMS NIH HHS / United States
R01 GM078221 / GM / NIGMS NIH HHS / United States
R01 GM084884-04 / GM / NIGMS NIH HHS / United States
/ / Canadian Institutes of Health Research / Canada
/ / Howard Hughes Medical Institute / United States