Root apical meristem

root  cap  secretes  a  polysaccharide  slime  that  lubricates  the  soil  around  the  tip  of  the  root

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#Id: 7878

#XL - Q Biochemistry

Crista junction

The connection between the inner boundary membrane and a crista

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#Id: 7879

#XL - Q Biochemistry

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

#XL - Q Biochemistry

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

#XL - Q Biochemistry

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

TLS Online TPP Program

#Id: 7882

#XL - Q Biochemistry

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

#XL - Q Biochemistry

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