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Unsupervised and Supervised Learning over the Energy Landscape for Protein Decoy Selection

1
Department of Computer Science, George Mason University, Fairfax, VA 22030, USA
2
Information Sciences (CCS-3) Group, Los Alamos National Laboratory, Los Alamos, NM 87545, USA
3
Center for Adaptive Human-Machine Partnership, George Mason University, Fairfax, VA 22030, USA
4
Department of Bioengineering, George Mason University, Fairfax, VA 22030, USA
5
School of Systems Biology, George Mason University, Fairfax, VA 22030, USA
*
Authors to whom correspondence should be addressed.
Biomolecules 2019, 9(10), 607; https://doi.org/10.3390/biom9100607
Received: 5 August 2019 / Revised: 3 October 2019 / Accepted: 4 October 2019 / Published: 14 October 2019
The energy landscape that organizes microstates of a molecular system and governs the underlying molecular dynamics exposes the relationship between molecular form/structure, changes to form, and biological activity or function in the cell. However, several challenges stand in the way of leveraging energy landscapes for relating structure and structural dynamics to function. Energy landscapes are high-dimensional, multi-modal, and often overly-rugged. Deep wells or basins in them do not always correspond to stable structural states but are instead the result of inherent inaccuracies in semi-empirical molecular energy functions. Due to these challenges, energetics is typically ignored in computational approaches addressing long-standing central questions in computational biology, such as protein decoy selection. In the latter, the goal is to determine over a possibly large number of computationally-generated three-dimensional structures of a protein those structures that are biologically-active/native. In recent work, we have recast our attention on the protein energy landscape and its role in helping us to advance decoy selection. Here, we summarize some of our successes so far in this direction via unsupervised learning. More importantly, we further advance the argument that the energy landscape holds valuable information to aid and advance the state of protein decoy selection via novel machine learning methodologies that leverage supervised learning. Our focus in this article is on decoy selection for the purpose of a rigorous, quantitative evaluation of how leveraging protein energy landscapes advances an important problem in protein modeling. However, the ideas and concepts presented here are generally useful to make discoveries in studies aiming to relate molecular structure and structural dynamics to function. View Full-Text
Keywords: energy landscape; basin; decoy selection; machine learning; purity; model quality assessment energy landscape; basin; decoy selection; machine learning; purity; model quality assessment
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Akhter, N.; Chennupati, G.; Kabir, K.L.; Djidjev, H.; Shehu, A. Unsupervised and Supervised Learning over the Energy Landscape for Protein Decoy Selection. Biomolecules 2019, 9, 607.

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