A new molecular mechanics force field for the oxidized form of blue copper proteins
A molecular mechanics force field for blue copper proteins has been developed, based on a rigid potential energy surface scan of the CuII/His/His/Cys/Met chromophore, using DFT (B3LYP) calculations and the AMBER force field for the protein backbone. The strain-energy-minimized structures of the mode...
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| Main Authors: | , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
26 March 2002
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| In: |
Journal of computational chemistry
Year: 2002, Volume: 23, Issue: 7, Pages: 697-705 |
| ISSN: | 1096-987X |
| DOI: | 10.1002/jcc.10084 |
| Online Access: | Verlag, Pay-per-use, Volltext: http://dx.doi.org/10.1002/jcc.10084 Verlag, Pay-per-use, Volltext: http://onlinelibrary.wiley.com/doi/10.1002/jcc.10084/abstract |
| Author Notes: | Peter Comba, Rainer Remenyi |
MARC
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| 520 | |a A molecular mechanics force field for blue copper proteins has been developed, based on a rigid potential energy surface scan of the CuII/His/His/Cys/Met chromophore, using DFT (B3LYP) calculations and the AMBER force field for the protein backbone. The strain-energy-minimized structures of the model chromophore alone are in excellent agreement with the DFT-optimized structure, and those of the entire set of cupredoxins (five structures are considered) are, within the experimental error limits, in good agreement with the single crystal structural data. However, the structural variation in the computed structures is much smaller than those in the experimental structures. It is shown that, due to the large error limits in the experimental data, a validation of the force field with experimental structural data is impossible because, within the error limits, all experimental structures considered are virtually identical. A validation on the basis of spectroscopic data and their correlation with experimental and computed structural data is proposed, and, as a first example, the correlation of intensity ratios of the charge transfer transitions with a specific distortion mode is presented. The quality of the correlation, using the computed structures, is higher than that with the X-ray structures, and this indicates that the computed structures are meaningful. | ||
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