The motor domain determines the large step of myosin-V - PubMed

Affiliations

• PMID: 11805840
• DOI: 10.1038/415192a

The motor domain determines the large step of myosin-V

Hiroto Tanaka et al. Nature. 2002.

Abstract

Class-V myosin proceeds along actin filaments with large ( approximately 36 nm) steps. Myosin-V has two heads, each of which consists of a motor domain and a long (23 nm) neck domain. In accordance with the widely accepted lever-arm model, it was suggested that myosin-V steps to successive (36 nm) target zones along the actin helical repeat by tilting its long neck (lever-arm). To test this hypothesis, we measured the mechanical properties of single molecules of myosin-V truncation mutants with neck domains only one-sixth of the native length. Our results show that the processivity and step distance along actin are both similar to those of full-length myosin-V. Thus, the long neck domain is not essential for either the large steps or processivity of myosin-V. These results challenge the lever-arm model. We propose that the motor domain and/or the actomyosin interface enable myosin-V to produce large processive steps during translocation along actin.

Comment in

• Stretching the lever-arm theory.

  Geeves MA. Geeves MA. Nature. 2002 Jan 10;415(6868):129-31. doi: 10.1038/415129a. Nature. 2002. PMID: 11805818 No abstract available.

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