Unassembled or misfolded proteins in the ER are often transported back to the cytosol, where they are degraded in the ubiquitin-proteasome pathway

TLS Online TPP Program

#Id: 9054

#Unit 4. Cell Communication and Cell Signaling

The activated β2-adrenergic receptor induces GDP-->GTP exchange on a stimulatory G protein (Gs).

TLS Online TPP Program

#Id: 9055

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 9056

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 9057

#Unit 4. Cell Communication and Cell Signaling

glutamate (E200) and arginine (R209) participate in binding of cAMP, which causes a conformational change in the loop that prevents binding of the loop to the C subunit.

TLS Online TPP Program

#Id: 9058

#Unit 4. Cell Communication and Cell Signaling

Epinephrine --> Gαs-GTP-->Adenylyl cyclase-->cAMP-->PKA

TLS Online TPP Program

#Id: 9059

#Unit 4. Cell Communication and Cell Signaling

PKA always phosphorylates a serine or threonine residue that is located within the common sequence motif: X-Arg-(Arg/Lys)-X-(Ser/Thr)-Φ