Domain

Domains are formed by combinations of SS, SSS, motifs and connected by loops and turns.

Highly conversed and may be common in most unrelated proteins

They evolve

Can function Independently

Average 100 amino acids 

Single hydrophobic core

TLS Online TPP Program

#Id: 10554

#Unit 4. Cell Communication and Cell Signaling

FADD can also be directly activated by binding to TRADD in RIPK1-independent apoptosis activation.

TLS Online TPP Program

#Id: 10555

#Unit 4. Cell Communication and Cell Signaling

Caspase-8 cleaves and activates several effector caspases, caspase-3, 6, 7 to complete apoptotic cell death.

TLS Online TPP Program

#Id: 10556

#Unit 4. Cell Communication and Cell Signaling

Intrinsic apoptosis pathway

Caspase-8 cleaves the BH3-interacting-domain death agonist (Bid), resulting tBid fragment

TLS Online TPP Program

#Id: 10557

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 10558

#Unit 4. Cell Communication and Cell Signaling

tBid fragment binds to Bcl-2 on the outer mitochondrial membrane, leading to the dissociation of Bak and Bax and release of cytochrome c into the cytosol

TLS Online TPP Program

#Id: 10559

#Unit 4. Cell Communication and Cell Signaling

In cells lacking functional caspase-8 or FADD, TNFα

triggers an alternative pathway, necroptosis.