Biology 1002B Lecture Notes - Lecture 4: Channelrhodopsin, Carotenoid, Simple Eye In Invertebrates

• School: Western University
• Department: Biology
• Course: Biology 1002B
• Professor: Denis Maxwell

Document Summary

Called channelrhodopsins: carotenoid serves 2 purposes, light need to be captured by channelrhodopsin. You do(cid:374)"t (cid:449)a(cid:374)t the light fro(cid:373) the back side to hit the channelrhodopsin, because if light can hit from (cid:271)oth dire(cid:272)tio(cid:374)s (cid:272)hla(cid:373)(cid:455) (cid:449)o(cid:374)"t k(cid:374)o(cid:449) (cid:449)hi(cid:272)h (cid:449)a(cid:455) to tur(cid:374). This helps chlamy to orientate itself: what gene can also be mutated in order to cause the cell not be phototaxis??, channelrhodopsin is a light gated ion channel. A protein that sits in the plasma membrane, when it absorbs light it opens up and it allow ions to go through. Like animal cells, cells are polarize, there is a voltage across the plasma membrane. Channelrhodopsin is not a single molecule, there is a pigment in it: channelrhodopsin is made up by retinal + opsin: Opsin is the protein, the protein coils spin the membrane 7 times. With in the 7 parts of the protein, a retinal pigment is embedded.