Two large classes of GTPase switch proteins are used in signal transduction pathways:

1. Heterotrimeric G proteins

2. Monomeric G proteins

TLS Online TPP Program

#Id: 1319

#XL - T Zoology

The heterotrimeric G protein coupled to rhodopsin, called Transducin.

TLS Online TPP Program

#Id: 1320

#XL - T Zoology

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

#XL - T Zoology

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

TLS Online TPP Program

#Id: 1322

#XL - T Zoology

Gαi activate α2-Adrenergic receptor

TLS Online TPP Program

#Id: 1323

#XL - T Zoology

Positive and negative regulation of adenylyl cyclase activity-

Gαs-coupled receptors

Gαi-coupled receptors

TLS Online TPP Program

#Id: 1324

#XL - T Zoology