Computer modeling of nitroxide spin labels on proteins.

Computer modeling of nitroxide spin labels on proteins.
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DOI:
10.1002/bip.21699
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发表时间:
2012-01
期刊:
影响因子:
2.9
通讯作者:
Haworth, Ian S.
Haworth, Ian S.
中科院分区:
生物学4区
文献类型:
--
作者:
Hatmal, Ma'mon M.;Li, Yiyu;Hegde, Balachandra G.;Hegde, Prabhavati B.;Jao, Christine C.;Langen, Ralf;Haworth, Ian S.

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Electron paramagnetic resonance (EPR) using site-directed spin-labeling (SDSL) can be used as an approach for determination of protein structures that are difficult to solve by other methods. One important aspect of this approach is the measurement of inter-label distances using the double electron-electron resonance (DEER) method. Interpretation of experimental data could be facilitated by a computational approach to calculation of inter-label distances. We describe an algorithm, PRONOX, for rapid computation of inter-label distances based on calculation of spin label conformer distributions at any site of a protein. The program incorporates features of the label distribution established experimentally, including weighting of favorable conformers of the label. Distances calculated by PRONOX were compared with new DEER distances for amphiphysin and annexin B12, and with published data for FCHo2 (F-BAR), endophilin, and α-synuclein; a total of 44 inter-label distances. The program reproduced these distances accurately (r2=0.94, slope=0.98). For 9 of the 11 distances for amphiphysin, PRONOX reproduced the experimental data to within 2.5 Å. The speed and accuracy of PRONOX suggests that the algorithm can be used for fitting to DEER data for determination of protein tertiary structure.
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