Abstract
Carotenoids are one of the largest classes among biological pigments. They are found both in free form (dissolved in hydrophobic environments), and bound in stoichiometric complexes with protein (carotenoproteins). The interaction between the carotenoid and the protein environment is determined by the molecular conformation and dynamic behavior of the cofactor. In this work, using molecular modeling methods, we analyzed the entire set of alternative conformational states of cyclic carotenoids. The result of the theoretical study is an energysorted catalog of alternative conformational states for biogenic cyclic carotenoids and their optical isomers. The conformational states characterized in this study can be used to correctly select initial conditions when solving problems of molecular modeling of carotenoproteins
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