When PSII receives more light than PSI, plastoquinone becomes predominantly reduced, resulting in activation of the LHCII kinase. The kinase phosphorylates LHCII, resulting in migration of LHCII away from the granal region where it can associate with PSI, thereby adjusting the relative excitation of PSII and PSI.

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.

TLS Online TPP Program

#Id: 1322

#Unit 4. Cell Communication and Cell Signaling

Gαi activate α2-Adrenergic receptor