The key event in controlling replication is the behavior of the ORC complex at the origin.

Cdc6 protein is an unstable protein that is synthesized only in G1.

Cdc6 binds to ORC and allows MCM proteins.

Cdc6 binds to ORC and allows MCM proteins to bind.

Cdt1 facilitates MCM loading on origins

TLS Online TPP Program

#Id: 9980

#Unit 4. Cell Communication and Cell Signaling

Notum, a hydrolase that associates with glypican and then cleaves off Wnt’s attached lipids in a process of deacylation or delipidation.

TLS Online TPP Program

#Id: 9981

#Unit 4. Cell Communication and Cell Signaling

Delipidation process reduces Wnt signaling, creates a negative feedback mechanism for preventing excessive Wnt signaling.

TLS Online TPP Program

#Id: 9982

#Unit 4. Cell Communication and Cell Signaling

Frizzled receptor possesses a unique hydrophobic cleft adapted to interact with lipidated Wnts, a binding conformation mimicked in Notum’s structure as well.

TLS Online TPP Program

#Id: 9983

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 9984

#Unit 4. Cell Communication and Cell Signaling

TLS Online TPP Program

#Id: 9985

#Unit 4. Cell Communication and Cell Signaling

Antagonists of Wnt:

Secreted frizzled-related protein (Sfrp)

Wnt inhibitory factor (Wif)

Dickkopf (Dkk) family