Cytoskeleton - Microfilaments

Question 1

What do ABPs stand for and what is their role?

Answer 1

• Actin binding proteins (for MFs)
• cross-linking, anchoring

Question 2

what are the roles of the motor proteins (2 heavy chains, 2 or more light chains) in the MFs?

1. head
2. neck
3. tail

Answer 2

1. binds actin filaments (G- and F-actin)
2. bendy area allows movement, responds to signals, controls light chains
3. 2 coiled heavy chains work w/other myosine molecules’ tails w/ cargo molecules

Question 3

what does f and g actin stand for

Answer 3

• f - filamentous
• g - globular actin

Question 5

What are stress fibres ?

Answer 5

thick and stable bundles of actin