The extracellular domain of cytokine receptors are constructed of two subdomains, each contains seven conserved β strands folded together

TLS Online TPP Program

#Id: 8635

#XL - T Zoology

During late anaphase, telophase and G1, APC/C bound to Cdh1 targets B type cyclins and geminin for degradation.

TLS Online TPP Program

#Id: 8637

#XL - T Zoology

The G1 cyclin-CDK complex (Cln3-CDK in yeast) stimulates the formation of G1/S phase cyclin-CDKs, which initiate bud formation, centrosome duplication, and DNA replication.

TLS Online TPP Program

#Id: 8638

#XL - T Zoology

Once sufficient Cln3 is synthesized from its mRNA, Cln3-CDK complexes phosphorylate and inactivate the transcriptional repressor Whi5.

TLS Online TPP Program

#Id: 8639

#XL - T Zoology

Phosphorylation of Whi5 promotes its export out of the nucleus, allowing the transcription factor complex SBF to induce transcription of the G1/S phase cyclin genes CLN1 and CLN2.

TLS Online TPP Program

#Id: 8640

#XL - T Zoology

In vertebrates, Rb is the major guardian of the cell cycle, integrating information about DNA damage and cell growth

TLS Online TPP Program

#Id: 8641

#XL - T Zoology

Rb binds the activation domains of a E2F transcription factors, in the cytoplasm to prevent them from turning on the genes required for cell cycle progression.