The efficient formation of disulfide bonds in the lumen of the ER depends on the enzyme protein disulfide isomerase (PDI), which is present in all eukaryotic cells

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#Id: 8363

#Unit 2. Cellular Organization

Myosins have 

Motor head domain

Lever-arm neck domain

Cargo-binding tail domain

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#Unit 2. Cellular Organization

The first myosin discovered

Myosin II, was isolated from skeletal muscle.

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#Id: 8365

#Unit 2. Cellular Organization

Three classes of myosins:

Myosin I

Myosin II

Myosin V

TLS Online TPP Program

#Id: 8366

#Unit 2. Cellular Organization

Myosin I

single head domain

Function- Membrane association, endocytosis

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#Id: 8367

#Unit 2. Cellular Organization

Myosin II

Two heads and assembles into bipolar filaments

Small and non-processive

Function- Contraction

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#Id: 8368

#Unit 2. Cellular Organization

Myosin V

Two heads but does not assemble into filaments

Large and processive

Function- Organelle transport