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RETINAL‐OPSIN LINKAGE OF CEPHALOPOD RHODOPSIN
Author(s) -
Kito Yuji,
Nashima Kazuko
Publication year - 1980
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1980.tb03786.x
Subject(s) - rhodopsin , schiff base , chemistry , cationic polymerization , bromide , retinal , vinyl ether , stereochemistry , inorganic chemistry , polymer chemistry , organic chemistry , biochemistry , copolymer , polymer
Abstract— The pK a of the Schiff base of N‐retinylidene butylamine was determined in anionic (sodium dodecylsulfate), cationic (cetyltrimethylammonium bromide) and nonionic (polyoxyethylene (9) lauryl ether) detergent solutions. The pK a of the Schiff base was raised from 6.4 to 9.9 by the effect of the neighboring anion. The rise of the pK a was affected by the ion strength. Squid metarhodopsin behaved in a manner similar to the model Schiff base in the anionic detergent solution. The cationic group showed the opposite effect on the pK a of the Schiff base. The retinal Schiff base in rhodopsin might be heavily influenced by adjacent anionic groups. The nature of the interaction is discussed.