The holoenzyme could transcribe intact phage T4 DNA in vitro quite actively, the core enzyme had little ability to do this.

TLS Online TPP Program

#Id: 7879

#Unit 2. Cellular Organization

The curvature of the crista junctions is due to a protein complex called MICOS (mitochondrial contact site and cristae organizing system).

TLS Online TPP Program

#Id: 7880

#Unit 2. Cellular Organization

MICOS has an integral membrane protein subunit that homo-oligomerizes and bends the inner membrane to produce high curvature.

TLS Online TPP Program

#Id: 7881

#Unit 2. Cellular Organization

MICOS mediates close juxtaposition of the outer membrane and inner membrane by binding to outer membrane–associated proteins

TLS Online TPP Program

#Id: 7882

#Unit 2. Cellular Organization

The binding partners for MICOS in the outer membrane are Tom and SAM protein complexes, (involved in import of proteins into the mitochondria). 

TLS Online TPP Program

#Id: 7883

#Unit 2. Cellular Organization

MICOS function as a diffusion barrier to prevent mixing of the distinct proteins and lipids in the boundary membrane and crista membranes.

TLS Online TPP Program

#Id: 7884

#Unit 2. Cellular Organization

The most abundant protein in the outer mitochondrial membrane is a mitochondrial β-barrel porin called VDAC (voltage-dependent anion channel).