Relocating the active-site lysine in rhodopsin and implications for evolution of retinylidene proteins

视紫质

视紫质 （）也称视紫红质、視紫蛋白 、视紫素 、视网膜紫质 ，是大多数脊椎动物视网膜视桿细胞中亮紫红色的光敏视色素，其由视蛋白和11-顺视黄醛辅基结合而成，最大光吸收在500nm附近，可将所吸收的光信号转化为跨膜电信号，其光电响应是视觉形成的最初阶段.

Rhodopsin

Rhodopsin, also known as visual purple, is a protein encoded by the RHO gene and a G-protein-coupled receptor (GPCR).

Opsin

Opsins are a group of light-sensitive proteins found in photoreceptor cells of the retina.