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Opsyny Przypisy | Linki zewnętrzne | Menu nawigacyjneRhodopsinPhotopigment MoleculesFamily Opsin (IPR001760), Short name: Opsin

Receptory


sprzężonych z białkami Greceptorów błonowychsiatkówkichromoforamifotonówsygnał elektrochemicznywidzeniu zmierzchowymrodopsynapręcikachwidzeniu barwnymfotopowymjodopsynyczopkachfotopsynymelanopsynarytm dobowyodruch źreniczny












Opsyny




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Rhodopsin

Opsyny – grupa światłoczułych, sprzężonych z białkami G, receptorów błonowych o masie cząsteczkowej 35–55 kDa, należących do rodziny białek retinylydynowych. Opsyny występują w warstwie receptorowej siatkówki jako kompleksy z chromoforami. W proces widzenia jest zaangażowanych pięć klasycznych grup opsyn, które pośredniczą w przekształcaniu fotonów w sygnał elektrochemiczny – pierwszym etapie transdukcji sygnału wzrokowego. W widzeniu zmierzchowym bierze udział rodopsyna, występująca w pręcikach, natomiast w widzeniu barwnym (fotopowym) uczestniczą jodopsyny, występujące w czopkach[1] (kompleksy chromofor–fotopsyny). Inne białko z grupy opsyn, melanopsyna, zaangażowane jest w rytm dobowy i odruch źreniczny, ale nie bezpośrednio w proces widzenia.



Przypisy |



  1. ↑ Bruce MacEvoy: Photopigment Molecules (ang.). handprint.com. [dostęp 2014-07-03].



Linki zewnętrzne |



  • Family Opsin (IPR001760), Short name: Opsin w: InterPro Protein sequence analysis & classification



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