Key result
Binding of muscle tropomyosin to muscle F-actin at an 8.4/1.0 molar ratio protects 58% of the F-actin from depolymerization by actin-depolymerizing factor for at least 3 hours.
Why the study?
Does tropomyosin binding to F-actin protect it from depolymerization by actin-depolymerizing factor in vitro?
Population
In vitro model using brain or muscle F-actin and actin-depolymerizing factor isolated from chick embryo brain
Comparison
Binding of muscle tropomyosin to muscle F-actin vs F-actin without tropomyosin
Design
Preclinical
Follow-up
at least 3 hr
Authors
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May inform cytoskeletal regulation models; leaves open in vivo relevance for cell motility.
Does tropomyosin binding to F-actin protect it from depolymerization by actin-depolymerizing factor in vitro?
Tropomyosin binding specifically protects F-actin filaments from disassembly by actin-depolymerizing factor in vitro.
Bernstein et al. (1982) studied this question. Tropomyosin binding to F-actin vs. F-actin lacking tropomyosin was evaluated on Protection from depolymerization by excess actin-depolymerizing factor. Binding of muscle tropomyosin to muscle F-actin at an 8.4/1.0 molar ratio protects 58% of the F-actin from depolymerization by actin-depolymerizing factor for at least 3 hours.
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