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Exploring the potential energy surface of retinal, a comparison of the performance of different methods

✍ Scribed by Fredrik Blomgren; Sven Larsson

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
113 KB
Volume
26
Category
Article
ISSN
0192-8651

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✦ Synopsis

Abstract

The ground state structure of retinal has been investigated. We found that DFT and CASSCF produce different results for the bond length alternation in a model system of retinal. Quantum mechanics/molecular mechanics calculations including the closest surrounding amino acids have been performed, using DFT and CASSCF to calculate the structure of retinal in the protein cavity. The planarity of the retinal molecule is affected by the surrounding protein. DFT and CASSCF produce different twist angles. The difference between CASSCF and DFT appears to be related to the positively charged nitrogen of the Schiff base, which leads to different π‐bond orders produced by the two methods. Β© 2005 Wiley Periodicals, Inc. J Comput Chem 26: 738–742, 2005

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