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10 UNRES server version 01.12.2017
13 <b><a href="http://unres.pl"> UNRES</a></b>
14 is a highly reduced protein model; only two interaction sites: united
15 side chain and united peptide group per residue are present. Owing to this
16 reduction, it offers ~1000-4000-fold speed up in molecular dynamics
17 simulations compared to all-atom approaches. With recently introduced
18 parallelization of energy and force evaluation, it enables us to perform <i>ab
19 initio</i> folding simulations of 200-residue proteins in hours and simulations
20 of large biologically inportant conformational changes in large proteins
21 (e.g., molecular chaperones) in days of wall-clock time.
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24 <img src="static/unres_model_new.png" width="320">
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29 The <b>UNRES</b> force field has been developed on a solid statistical-mechanical
30 basis, by expanding the potential of mean force of a system containing
31 polypeptide chain(s) in water into cluster-cumulant series and
32 parameterization of the terms of the series (factors) based on simple model
33 systems. Therefore, even though no knowledge-based information is used in
34 simulations (from homology modeling, loop and contact prediction, etc.), the
35 force field, in its present version can be used in <i>ab initio</i> folding
36 simulations and ab initio prediction of protein structures to predict the
37 folds of fragments with 50-200 residues in length.
43 A. Liwo, C. Czaplewski, S. Oldziej, A.V. Rojas, R. Kazmierkiewicz, M.
44 Makowski, R.K. Murarka, H.A. Scheraga. Simulation of protein structure and
45 dynamics with the coarse-grained UNRES force field. In: <i>Coarse-Graining of
46 Condensed Phase and Biomolecular Systems.</i>, ed. G. Voth, Taylor & Francis,
47 2008, Chapter 8, pp. 107-122
51 Y. He, Y. Xiao, A. Liwo, H.A. Scheraga. Exploring the parameter space of the
52 coarse-grained UNRES force field by random search: selecting a transferable
53 medium-resolution force field.
54 <i>J. Comput. Chem.</i> 2009, 30, 2127-2135.
58 A. Liwo, M. Baranowski, C. Czaplewski, E. Gołaś, Y. He, D. Jagieła,
59 P. Krupa, M. Maciejczyk, M. Makowski, M.A. Mozolewska, A. Niadzvedtski,
60 S. Ołdziej, H.A. Scheraga, A.K. Sieradzan, R. Ślusarz, T. Wirecki, Y. Yin,
62 A unified coarse-grained model of biological macromolecules based on
63 mean-field multipole-multipole interactions
64 <i>J. Mol. Model.</i> 2014, 20, 1-15.
68 A.K. Sieradzan, P. Krupa, H.A. Scheraga, A. Liwo, C. Czaplewski.
69 Physics-based potentials for the coupling between backbone- and
70 side-chain-local conformational states in the United Residue (UNRES) force
71 field for protein simulations.
72 <i>J. Chem. Theory. Comput.</i> 2015, 11, 817-831.
76 P. Krupa, A. Hałabis, W. Żmudzińska, S. Ołdziej, H.A. Scheraga, A. Liwo.
77 Maximum Likelihood Calibration of the UNRES Force Field for Simulation of
78 Protein Structure and Dynamics.
79 <i>J. Chem. Inf. Model.</i> 2017, 57, 2364–2377.