To nucleate the assembly of branched actin filaments, Arp2/3 needs to be activated by a nucleation promoting factor (NPF)

TLS Online TPP Program

#Id: 8857

#XL - R Botany

The ATPase domains interact with the proteins

Scc1 and Scc3, which together form a cohesin ring structure which embrace one or both copies of the replicated DNA.

TLS Online TPP Program

#Id: 8858

#XL - R Botany

Cohesin-mediated cohesion between sister chromatids is established by a two-step process:

1.Loading and unloading of cohesins

2. Stabilization of cohesins

TLS Online TPP Program

#Id: 8859

#XL - R Botany

During G1, 

cohesins associate with chromosomes by cohesin loading factors Scc2 and Scc4 and unloaded continuously by a cohesin associated complex Pds5 and Wap1 proteins. 

TLS Online TPP Program

#Id: 8860

#XL - R Botany

During S phase

DNA-bound G1 cohesins Convert into cohesive complexes by cohesin acetyl transferases (CoATs)

which acetylate Smc3 subunit & prevents unloading of cohesins by Pds5-Wapl, thereby stabilizing the cohesins on chromosomes.

TLS Online TPP Program

#Id: 8862

#XL - R Botany

In vertebrates, stabilization of cohesins requires the cohesin-associated factor sororin.

TLS Online TPP Program

#Id: 8864

#XL - R Botany

Defects of cohesin’s gene expression regulation function are the cause of a group of diseases collectively called cohesinopathies.