Osmotic stress is the main determinant of the diameter of the actin filament.
The diameter of the actin filament is influenced by osmotic stress, being 9.0 nm at 1 x 10(5) dynes/cm2 and 6.8 nm at 9.00 x 10(6) dynes/cm2. At 1.81 x 10(5) dynes/cm2, the protein osmotic pressure in frog muscle, the diameter is 7.95 nm. The diameter of the tropomyosin-decorated actin filament is also influenced by osmotic stress even though, at the low pressures (up to 2 x 10(5) dynes/cm2), the decorated filament is significantly more resistant to compression than the undecorated actin filament.
Grazi
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Istituto di Chimica Biologica, Università di Ferrara, Italy.
Schwienbacher
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Magri
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D000199:Actins / Q000737:chemistry* / Q000302:isolation & purification; D000818:Animals; D009132:Muscles; D009997:Osmotic Pressure; D011817:Rabbits; D013314:Stress, Mechanical; D014335:Tropomyosin / Q000737:chemistry / Q000302:isolation & purification
D000199:Actins; D014335:Tropomyosin