The unique insert at the end of the myosin VI motor is the sole determinant of directionality

Hyokeun Park, Anna Li, Li Qiong Chen, Anne Houdusse, Paul R. Selvin, H. Lee Sweeney

Research output: Contribution to journalArticle

Abstract

Myosin VI moves toward the pointed (minus) end of actin filaments, the reverse direction of other myosin classes. The myosin VI structure demonstrates that a unique insert at the end of the motor repositions its lever arm and is at least in pact responsible for the reversal of directionality. However, it has been proposed that there must be additional modifications within the motor that contribute to its large step size and to the reversal of directionality. To ascertain the inherent directionality of the motor core, we attached the myosin V lever arm to myosin VI, with and without the unique insect. If the insect was maintained, the motor moved toward the minus end of actin filaments, but if removed, movement was redirected toward the plus end. Single-molecule studies revealed that further adaptations within the motor increase the magnitude and variability of the plus-end directed converter movements, and unexpectedly provide the source of the highly variable myosin VI step size. Thus, the unique insert is necessary and sufficient to reverse an inherently plus-end directed myosin.

Original languageEnglish (US)
Pages (from-to)778-783
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume104
Issue number3
DOIs
StatePublished - Jan 16 2007

Keywords

  • Lever arm
  • Motility
  • Reverse direction
  • Unconventional myosin

ASJC Scopus subject areas

  • General

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