Under ‘‘light conditions,’’ reduced thioredoxin cleaves the disulfide bonds of CP12 and phosphoribulokinase. 

The reduction of phosphoribulokinase and CP12 separates the

components of the ternary complex releasing the active phosphoribulokinase and the active A4B4-glyceraldehyde 3-phosphate dehydrogenase.

TLS Online TPP Program

#Id: 1316

#Unit 4. Cell Communication and Cell Signaling

G protein coupled receptor contains seven membrane-spanning α helices & heterotrimeric G protein.

TLS Online TPP Program

#Id: 1317

#Unit 4. Cell Communication and Cell Signaling

Muscarinic acetylcholine receptor is coupled to a Gαi protein.

TLS Online TPP Program

#Id: 1318

#Unit 4. Cell Communication and Cell Signaling

Rod cells sense light via light-sensitive GPCR known as Rhodopsin.

TLS Online TPP Program

#Id: 1319

#Unit 4. Cell Communication and Cell Signaling

The heterotrimeric G protein coupled to rhodopsin, called Transducin.

TLS Online TPP Program

#Id: 1320

#Unit 4. Cell Communication and Cell Signaling

On absorption of a photon, the retinal moiety of rhodopsin is immediately converted into 11-cis-retinal to the all-trans retinal.

TLS Online TPP Program

#Id: 1321

#Unit 4. Cell Communication and Cell Signaling

Rapid Termination of the Rhodopsin Signal Transduction Pathway Rhodopsin kinase & Arrestin.