The long-term goal of this proposal is to predict protein structures and protein-protein complex structures to facilitate the development of therapeutic drugs. This proposal addresses the urgent need for a more accurate energy function for high-resolution protein-structure prediction and protein-protein interaction prediction. Currently, there are three complementary approaches to this problem, based on: physical principles (physical-based), known protein structures (knowledge-based or statistical), or empirical methods. Among the three, establishing a statistical energy function at an """"""""all-atom"""""""" level of detail is the least explored approach. Here we propose a statistical energy function built on a mixture of atoms and molecular fragments, rather than on atoms alone. Inclusion of molecular fragments accounts for many interactions missed partially or wholly by commonly used atom-based approaches. Preliminary studies have shown a multi-fold improvement in the accuracy and specificity of refolding completely unfolded segments with secondary structure elements. This success is a preview of the potential of the proposed fragment-based approach to statistical energy functions.

Public Health Relevance

Many diseases including Alzheimer's disease, cystic fibrosis, and Bovine Spongiform Encephalopathy (Mad Cow disease) are caused by malfunction of the nanomachines called proteins. The energy function that governs the function of these proteins has yet to be discovered. Here, we propose to uncover the energy function by developing a fragment-based statistical approach. Successful completion of this project should allow us to more accurately predict protein structures based on their gene-specified sequence information. Knowing a protein's structure is essential for understanding its function and developing therapeutic drugs to block or activate the protein's function.

Agency
National Institute of Health (NIH)
Institute
National Institute of General Medical Sciences (NIGMS)
Type
Research Project (R01)
Project #
5R01GM085003-04
Application #
8118806
Study Section
Macromolecular Structure and Function D Study Section (MSFD)
Program Officer
Wehrle, Janna P
Project Start
2008-08-01
Project End
2013-07-31
Budget Start
2011-08-01
Budget End
2013-07-31
Support Year
4
Fiscal Year
2011
Total Cost
$272,270
Indirect Cost
Name
Indiana University-Purdue University at Indianapolis
Department
Type
Schools of Arts and Sciences
DUNS #
603007902
City
Indianapolis
State
IN
Country
United States
Zip Code
46202
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Yang, Yuedong; Zhao, Huiying; Wang, Jihua et al. (2014) SPOT-Seq-RNA: predicting protein-RNA complex structure and RNA-binding function by fold recognition and binding affinity prediction. Methods Mol Biol 1137:119-30
Liang, Shide; Zhang, Chi; Zhou, Yaoqi (2014) LEAP: highly accurate prediction of protein loop conformations by integrating coarse-grained sampling and optimized energy scores with all-atom refinement of backbone and side chains. J Comput Chem 35:335-41
Zhao, Huiying; Yang, Yuedong; Janga, Sarath Chandra et al. (2014) Prediction and validation of the unexplored RNA-binding protein atlas of the human proteome. Proteins 82:640-7
Faraggi, Eshel; Zhou, Yaoqi; Kloczkowski, Andrzej (2014) Accurate single-sequence prediction of solvent accessible surface area using local and global features. Proteins 82:3170-6
Zhao, Huiying; Wang, Jihua; Zhou, Yaoqi et al. (2014) Predicting DNA-binding proteins and binding residues by complex structure prediction and application to human proteome. PLoS One 9:e96694
Zhao, Huiying; Yang, Yuedong; Lin, Hai et al. (2013) DDIG-in: discriminating between disease-associated and neutral non-frameshifting micro-indels. Genome Biol 14:R23
Li, Zhixiu; Yang, Yuedong; Zhan, Jian et al. (2013) Energy functions in de novo protein design: current challenges and future prospects. Annu Rev Biophys 42:315-35
Zhou, Bing-Rui; Feng, Hanqiao; Kato, Hidenori et al. (2013) Structural insights into the histone H1-nucleosome complex. Proc Natl Acad Sci U S A 110:19390-5
Wang, Jihua; Yang, Yuedong; Cao, Zanxia et al. (2013) The role of semidisorder in temperature adaptation of bacterial FlgM proteins. Biophys J 105:2598-605

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