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Prediction of homoprotein and heteroprotein complexes by protein docking and template-based modeling: a CASP-CAPRI experiment

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journal contribution
posted on 20.08.2020 by Marc F Lensink, Sameer Velankar, Andriy Kryshtafovych, Shen-You Huang, Dina Schneidman-Duhovny, Andrej Sali, Joan Segura, Narcis Fernandez-Fuentes, Shruthi Viswanath, Ron Elber, Sergei Grudinin, Petr Popov, Emilie Neveu, Hasup Lee, Minkyung Baek, Sangwoo Park, Lim Heo, Gyu Rie Lee, Chaok Seok, Sanbo Qin, Huan-Xiang Zhou, David W Ritchie, Bernard Maigret, Marie-Dominique Devignes, Anisah Ghoorah, Mieczyslaw Torchala, Raphaël AG Chaleil, Paul A Bates, Efrat Ben-Zeev, Miriam Eisenstein, Surendra S Negi, Zhiping Weng, Thom Vreven, Brian G Pierce, Tyler M Borrman, Jinchao Yu, Françoise Ochsenbein, Raphaël Guerois, Anna Vangone, João PGLM Rodrigues, Gydo van Zundert, Mehdi Nellen, Li Xue, Ezgi Karaca, Adrien SJ Melquiond, Koen Visscher, Panagiotis L Kastritis, Alexandre MJJ Bonvin, Xianjin Xu, Liming Qiu, Chengfei Yan, Jilong Li, Zhiwei Ma, Jianlin Cheng, Xiaoqin Zou, Yang Shen, Lenna X Peterson, Hyung-Rae Kim, Amit Roy, Xusi Han, Juan Esquivel-Rodriguez, Daisuke Kihara, Xiaofeng Yu, Neil J Bruce, Jonathan C Fuller, Rebecca C Wade, Ivan Anishchenko, Petras J Kundrotas, Ilya A Vakser, Kenichiro Imai, Kazunori Yamada, Toshiyuki Oda, Tsukasa Nakamura, Kentaro Tomii, Chiara Pallara, Miguel Romero-Durana, Brian Jiménez-García, Iain H Moal, Juan Férnandez-Recio, Jong Young Joung, Jong Yun Kim, Keehyoung Joo, Jooyoung Lee, Dima Kozakov, Sandor Vajda, Scott Mottarella, David R Hall, Dmitri Beglov, Artem Mamonov, Bing Xia, Tanggis Bohnuud, Carlos A Del Carpio, Eichiro Ichiishi, Nicholas Marze, Daisuke Kuroda, Shourya S Roy Burman, Jeffrey J Gray, Edrisse Chermak, Luigi Cavallo, Romina Oliva, Andrey Tovchigrechko, Shoshana J Wodak
We present the results for CAPRI Round 30, the first joint CASP-CAPRI experiment, which brought together experts from the protein structure prediction and protein-protein docking communities. The Round comprised 25 targets from amongst those submitted for the CASP11 prediction experiment of 2014. The targets included mostly homodimers, a few homotetramers, and two heterodimers, and comprised protein chains that could readily be modeled using templates from the Protein Data Bank. On average 24 CAPRI groups and 7 CASP groups submitted docking predictions for each target, and 12 CAPRI groups per target participated in the CAPRI scoring experiment. In total more than 9500 models were assessed against the 3D structures of the corresponding target complexes. Results show that the prediction of homodimer assemblies by homology modeling techniques and docking calculations is quite successful for targets featuring large enough subunit interfaces to represent stable associations. Targets with ambiguous or inaccurate oligomeric state assignments, often featuring crystal contact-sized interfaces, represented a confounding factor. For those, a much poorer prediction performance was achieved, while nonetheless often providing helpful clues on the correct oligomeric state of the protein. The prediction performance was very poor for genuine tetrameric targets, where the inaccuracy of the homology-built subunit models and the smaller pair-wise interfaces severely limited the ability to derive the correct assembly mode. Our analysis also shows that docking procedures tend to perform better than standard homology modeling techniques and that highly accurate models of the protein components are not always required to identify their association modes with acceptable accuracy. Proteins 2016; 84(Suppl 1):323-348. © 2016 Wiley Periodicals, Inc.