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Lis1 acts as a "clutch" between the ATPase and microtubule-binding domains of the dynein motor.

Abstract
The lissencephaly protein Lis1 has been reported to regulate the mechanical behavior of cytoplasmic dynein, the primary minus-end-directed microtubule motor. However, the regulatory mechanism remains poorly understood. Here, we address this issue using purified proteins from Saccharomyces cerevisiae and a combination of techniques, including single-molecule imaging and single-particle electron microscopy. We show that rather than binding to the main ATPase site within dynein's AAA+ ring or its microtubule-binding stalk directly, Lis1 engages the interface between these elements. Lis1 causes individual dynein motors to remain attached to microtubules for extended periods, even during cycles of ATP hydrolysis that would canonically induce detachment. Thus, Lis1 operates like a "clutch" that prevents dynein's ATPase domain from transmitting a detachment signal to its track-binding domain. We discuss how these findings provide a conserved mechanism for dynein functions in living cells that require prolonged microtubule attachments.
AuthorsJulie Huang, Anthony J Roberts, Andres E Leschziner, Samara L Reck-Peterson
JournalCell (Cell) Vol. 150 Issue 5 Pg. 975-86 (Aug 31 2012) ISSN: 1097-4172 [Electronic] United States
PMID22939623 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
CopyrightCopyright © 2012 Elsevier Inc. All rights reserved.
Chemical References
  • Microtubule-Associated Proteins
  • Ndl1 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins
  • 1-Alkyl-2-acetylglycerophosphocholine Esterase
  • PAFAH1B1 protein, human
  • Dyneins
Topics
  • 1-Alkyl-2-acetylglycerophosphocholine Esterase (chemistry, genetics, metabolism)
  • Amino Acid Sequence
  • Animals
  • Dyneins (chemistry, metabolism)
  • Humans
  • Microtubule-Associated Proteins (chemistry, genetics, metabolism)
  • Microtubules (metabolism)
  • Models, Molecular
  • Molecular Sequence Data
  • Protein Structure, Tertiary
  • Saccharomyces cerevisiae (metabolism)
  • Saccharomyces cerevisiae Proteins (metabolism)

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