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The Tubulation Activity of a Fission Yeast F-BAR Protein Is Dispensable for Its Function in Cytokinesis

Journal Article · · Cell Reports
 [1];  [2];  [1];  [3];  [1];  [3];  [1]
  1. Vanderbilt Univ., Nashville, TN (United States)
  2. Vanderbilt Univ., Nashville, TN (United States); Okinawa Inst. of Science and Technology (Japan)
  3. Univ. of Kentucky, Lexington, KY (United States)
F-BAR proteins link cellular membranes to the actin cytoskeleton in many biological processes. Here we investigated the function of the Schizosaccharomyces pombe Imp2 F-BAR domain in cytokinesis and find that it is critical for Imp2’s role in contractile ring constriction and disassembly. To understand mechanistically how the F-BAR domain functions, we determined its structure, elucidated how it interacts with membranes, and identified an interaction between dimers that allows helical oligomerization and membrane tubulation. Using mutations that block either membrane binding or tubulation, we find that membrane binding is required for Imp2’s cytokinetic function but that oligomerization and tubulation, activities often deemed central to F-BAR protein function, are dispensable. Accordingly, F-BARs that do not have the capacity to tubulate membranes functionally substitute for the Imp2 F-BAR, establishing that its major role is as a cell-cycle-regulated bridge between the membrane and Imp2 protein partners, rather than as a driver of membrane curvature.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
NIH
OSTI ID:
1251216
Journal Information:
Cell Reports, Journal Name: Cell Reports Journal Issue: 3 Vol. 14; ISSN 2211-1247
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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Cited By (9)

Integrated control of formin-mediated actin assembly by a stationary inhibitor and a mobile activator journal August 2018
The phosphatase inhibitor Sds23 regulates cell division symmetry in fission yeast journal November 2019
The intrinsically disordered region of the cytokinetic F-BAR protein Cdc15 performs a unique essential function in maintenance of cytokinetic ring integrity journal October 2019
BAR scaffolds drive membrane fission by crowding disordered domains posted_content July 2018
A New Membrane Protein Sbg1 Links the Contractile Ring Apparatus and Septum Synthesis Machinery in Fission Yeast journal October 2016
Nanoscale architecture of the Schizosaccharomyces pombe contractile ring journal September 2017
Role of the Hof1–Cyk3 interaction in cleavage-furrow ingression and primary-septum formation during yeast cytokinesis journal March 2018
The phosphatase inhibitor Sds23 regulates cell division symmetry in fission yeast posted_content September 2019
Molecular form and function of the cytokinetic ring journal June 2019

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