PMID- 26605462 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20151130 LR - 20151126 IS - 1549-9618 (Print) IS - 1549-9618 (Linking) VI - 7 IP - 9 DP - 2011 Sep 13 TI - Photodynamics of All-trans Retinal Protonated Schiff Base in Bacteriorhodopsin and Methanol Solution. PG - 2694-8 LID - 10.1021/ct200549z [doi] AB - Nonadiabatic ONIOM(CASSCF:AMBER) and CASSCF simulations elucidated different photodynamics of an all-trans retinal protonated Schiff base (RPSB) in bacteriorhodopsin and methanol as well as without an environment. The bR protein matrix holds RPSB tight via specific interactions and promotes bond-specific (along the C13 horizontal lineC14 bond), unidirectional, and ultrafast photoisomerization with a high quantum yield. In contrast, in methanol and for the twisted bare RPSB, photoisomerization is not bond-specific (mainly along the C11 horizontal lineC12 bond), is nonunidirectional, and is ineffective. Therefore, bR efficiently "catalyzes" photoisomerization and stores enough energy to promote the subsequent proton pumping and protein conformational changes. FAU - Li, Xin AU - Li X AD - Fukui Institute for Fundamental Chemistry, Kyoto University , Kyoto 606-8103, Japan. FAU - Chung, Lung Wa AU - Chung LW AD - Fukui Institute for Fundamental Chemistry, Kyoto University , Kyoto 606-8103, Japan. FAU - Morokuma, Keiji AU - Morokuma K AD - Fukui Institute for Fundamental Chemistry, Kyoto University , Kyoto 606-8103, Japan. LA - eng PT - Journal Article DEP - 20110816 PL - United States TA - J Chem Theory Comput JT - Journal of chemical theory and computation JID - 101232704 EDAT- 2011/09/13 00:00 MHDA- 2011/09/13 00:01 CRDT- 2015/11/26 06:00 PHST- 2015/11/26 06:00 [entrez] PHST- 2011/09/13 00:00 [pubmed] PHST- 2011/09/13 00:01 [medline] AID - 10.1021/ct200549z [doi] PST - ppublish SO - J Chem Theory Comput. 2011 Sep 13;7(9):2694-8. doi: 10.1021/ct200549z. Epub 2011 Aug 16.