Muscle cells have an abundant, modified smooth ER called the sarcoplasmic reticulum.

The release and reuptake of Ca2+ by the sarcoplasmic reticulum trigger myofibril contraction and relaxation, respectively

TLS Online TPP Program

#Id: 8594

#Unit 2. Cellular Organization

Emery-Dreifuss muscular dystrophy (EDMD)

mutations in emerin, a nesprin and a SUN protein

TLS Online TPP Program

#Id: 8595

#Unit 2. Cellular Organization

Mutations in lamin A 

cause progeria accelerated aging, such as Hutchison-Gilford progeria (“prematurely old”)

TLS Online TPP Program

#Id: 8596

#Unit 2. Cellular Organization

Septins 

GTP-binding proteins 

serve as an additional filament system in all eukaryotes except terrestrial plants. 

TLS Online TPP Program

#Id: 8597

#Unit 2. Cellular Organization

Septins assemble into nonpolar filaments that form rings and cagelike structures, or recruit and organize the actin and microtubule cytoskeletons.

TLS Online TPP Program

#Id: 8992

#Unit 2. Cellular Organization

TLS Online TPP Program

#Id: 8993

#Unit 2. Cellular Organization

Plakins 

Proteins that linked intermediate filament network to the rest of the cytoskeleton. 

Eg: Plectin