Table 8-2 Proteins Associated With Skeletal Muscle

Question 0

Myomesin

Answer 0

Cross-links thick filaments that are next to each other at M line.

Question 1

Myosin II

Answer 1

Major protein of thick filament; its interactiob with actin hydrolyzes ATP and produces contraction

Question 2

Titin

Answer 2

Forms an elastic lattice that anchors thick filaments to Z disks

Question 3

C protein

Answer 3

Binds to thick filaments at the M line

Question 4

G actin

Answer 4

Polymerizes to form thin filaments of F-actin; interaction of G-actin with myosin II assists in hydrolyzing ATP, resulting in contraction.

Question 5

Tropomyosin

Answer 5

Occupies grooves of the thin filaments

Question 6

Troponin

Answer 6

TnC Binds calcium
TnT Binds to tropomyosin
TnI Binds to actin, thus inhibiting actinmyosin interaction

Question 7

a- Actinin

Answer 7

Anchors plus ends of thin filaments to Z disk

Question 8

Nebulin

Answer 8

z disk protein that may assist a-actinin to anchor thin filaments to Z disk

Question 9

Cap Z

Answer 9

Forms part of the Z disk and caps the plus end of the thin filament

Question 10

Tropomodulin

Answer 10

Caps the minus end of the thin filament