Are Protein Force Fields Getting Better? A Systematic Benchmark on 524 Diverse NMR Measurements.
Are Protein Force Fields Getting Better? A Systematic Benchmark on 524 Diverse NMR Measurements.
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DOI:
10.1021/ct2007814
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发表时间:
2012-04-10
影响因子:
5.5
通讯作者:
Pande, Vijay S.
中科院分区:
文献类型:
--
作者:
Beauchamp, Kyle A.;Lin, Yu-Shan;Das, Rhiju;Pande, Vijay S.
Recent hardware and software advances have enabled simulation studies of protein systems on biophysically-relevant timescales, often revealing the need for improved force fields. Although early force field development was limited by the lack of direct comparisons between simulation and experiment, recent work from several labs has demonstrated direct calculation of NMR observables from protein simulations. Here we quantitatively evaluate recent molecular dynamics force fields against a suite of 524 chemical shift and J coupling (3JHNHα, 3JHNCβ, 3JHαC′, 3JHNC′, and 3JHαN) measurements on dipeptides, tripeptides, tetra-alanine, and ubiquitin. Of the force fields examined (ff96, ff99, ff03, ff03*, ff03w, ff99sb*, ff99sb-ildn, ff99sb-ildn-phi, ff99sb-ildn-nmr, CHARMM27, OPLS-AA), two force fields (ff99sb-ildn-phi, ff99sb-ildn-nmr) combining recent side chain and backbone torsion modifications achieve high accuracy in our benchmark. For the two optimal force fields, the calculation error is comparable to the uncertainty in the experimental comparison. This observation suggests that extracting additional force field improvements from NMR data may require increased accuracy in J coupling and chemical shift prediction. To further investigate the limitations of current force fields, we also consider conformational populations of dipeptides, which were recently estimated using vibrational spectroscopy.
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影响因子:
5.5
作者:
Hess, Berk;Kutzner, Carsten;Lindahl, Erik
通讯作者:
Lindahl, Erik
影响因子:
15
作者:
Hu, JS;Bax, A
通讯作者:
Bax, A
DOI:
10.1002/prot.340230412
发表时间:
1995-12-01
期刊:
PROTEINS-STRUCTURE FUNCTION AND GENETICS
影响因子:
--
作者:
Frishman, D;Argos, P
通讯作者:
Argos, P
影响因子:
15
作者:
Graf, Juergen;Nguyen, Phuong H.;Schwalbe, Harald
通讯作者:
Schwalbe, Harald
影响因子:
4.4
作者:
Horn, HW;Swope, WC;Head-Gordon, T
通讯作者:
Head-Gordon, T