title: Photoacoustic calorimetric study of the conversion of rhodopsin and isorhodopsin to lumirhodopsin.
abstract: The enthalpy and volume changes for the conversion of rhodopsin and isorhodopsin to lumirhodopsin have been investigated by time-resolved photoacoustic calorimetry. The conversion of rhodopsin to lumirhodopsin is endothermic by 3.9 +/- 5.9 kcal/mol and is accompanied by an increase in volume of 29.1 +/- 0.8 mL/mol. The lumirhodopsins produced from rhodopsin and isorhodopsin are energetically equivalent.
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309-0215.
authors.forename: K
authors.initials: K
authors.lastname: Marr
authors.forename: K S
authors.initials: KS
authors.lastname: Peters
mesh_terms: D000818:Animals; D002151:Calorimetry / Q000379:methods; D002417:Cattle; D003902:Detergents; D066298:In Vitro Techniques; D008027:Light; D012243:Rhodopsin / Q000031:analogs & derivatives* / Q000737:chemistry*; D013016:Sound; D013816:Thermodynamics
chemical_list: D003902:Detergents; C042882:isorhodopsin; C018586:lumirhodopsin; D012243:Rhodopsin