Protein backbone and sidechain torsion angles predicted from NMR chemical shifts using artificial neural networks.
Protein backbone and sidechain torsion angles predicted from NMR chemical shifts using artificial neural networks.
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DOI:
10.1007/s10858-013-9741-y
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发表时间:
2013-07
影响因子:
2.7
通讯作者:
Bax A
中科院分区:
文献类型:
--
作者:
Shen Y;Bax A
A new program, TALOS-N, is introduced for predicting protein backbone torsion angles from NMR chemical shifts. The program relies far more extensively on the use of trained artificial neural networks than its predecessor, TALOS+. Validation on an independent set of proteins indicates that backbone torsion angles can be predicted for a larger, ≥ 90% fraction of the residues, with an error rate smaller than ca 3.5%, using an acceptance criterion that is nearly two-fold tighter than that used previously, and a root mean square difference between predicted and crystallographically observed (φ,ψ) torsion angles of ca 12°. TALOS-N also reports sidechain χ1 rotameric states for about 50% of the residues, and a consistency with reference structures of 89%. The program includes a neural network trained to identify secondary structure from residue sequence and chemical shifts.
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