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Microtubules regulate focal adhesion dynamics through MAP4K4

Jiping Yue1, Min Xie2, Xuewen Gou1

  • 1Ben May Department for Cancer Research, The University of Chicago, Chicago, IL 60637, USA.

Developmental Cell
|December 10, 2014
PubMed

Insights

Microtubules deliver MAP4K4 to focal adhesions, promoting cell movement. This study identifies MAP4K4 as a key factor in focal adhesion disassembly and cell migration.

Area of Science:

  • Cell Biology
  • Molecular Biology

Background:

  • Focal adhesion (FA) disassembly is crucial for cell migration, involving integrin detachment from the extracellular matrix.
  • Microtubules (MTs) are known to facilitate FA turnover, but the specific protein factors remain unidentified.

Purpose of the Study:

  • To identify the molecular factor responsible for microtubule-mediated focal adhesion disassembly.
  • To elucidate the mechanism by which this factor regulates focal adhesion dynamics and cell migration.

Main Methods:

  • Quantitative proteomics was employed to identify proteins associated with focal adhesions and microtubules.
  • Gene knockout studies were performed to assess the function of the identified protein in cell migration.
  • Co-immunoprecipitation and biochemical assays were used to investigate protein-protein interactions and signaling pathways.

Main Results:

  • Mitogen-activated protein kinase kinase kinase kinase 4 (MAP4K4) was identified as a focal adhesion regulator that binds to microtubules.
  • MAP4K4 knockout resulted in stabilized focal adhesions and impaired cell migration.
  • MAP4K4 was shown to interact with EB2 and IQSEC1, a guanine nucleotide exchange factor for Arf6, linking it to integrin internalization.

Conclusions:

  • Microtubules deliver MAP4K4 to focal adhesions via EB2, where MAP4K4 activates Arf6 through IQSEC1.
  • This pathway enhances focal adhesion disassembly and promotes cell migration, providing insight into a critical cellular process.

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