BICD2, dynactin, and LIS1 cooperate in regulating dynein recruitment to cellular structures

Mol Biol Cell. 2012 Nov;23(21):4226-41. doi: 10.1091/mbc.E12-03-0210. Epub 2012 Sep 5.

Abstract

Cytoplasmic dynein is the major microtubule minus-end-directed cellular motor. Most dynein activities require dynactin, but the mechanisms regulating cargo-dependent dynein-dynactin interaction are poorly understood. In this study, we focus on dynein-dynactin recruitment to cargo by the conserved motor adaptor Bicaudal D2 (BICD2). We show that dynein and dynactin depend on each other for BICD2-mediated targeting to cargo and that BICD2 N-terminus (BICD2-N) strongly promotes stable interaction between dynein and dynactin both in vitro and in vivo. Direct visualization of dynein in live cells indicates that by itself the triple BICD2-N-dynein-dynactin complex is unable to interact with either cargo or microtubules. However, tethering of BICD2-N to different membranes promotes their microtubule minus-end-directed motility. We further show that LIS1 is required for dynein-mediated transport induced by membrane tethering of BICD2-N and that LIS1 contributes to dynein accumulation at microtubule plus ends and BICD2-positive cellular structures. Our results demonstrate that dynein recruitment to cargo requires concerted action of multiple dynein cofactors.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • 1-Alkyl-2-acetylglycerophosphocholine Esterase / metabolism*
  • Carrier Proteins / chemistry
  • Carrier Proteins / metabolism*
  • Dynactin Complex
  • Dyneins / metabolism*
  • HeLa Cells
  • Humans
  • Membrane Proteins / chemistry
  • Membrane Proteins / metabolism*
  • Microtubule-Associated Proteins / metabolism*
  • Microtubules / metabolism*
  • Multiprotein Complexes / metabolism
  • Nuclear Envelope / metabolism
  • Protein Binding
  • Protein Stability
  • Protein Transport
  • Transport Vesicles / metabolism
  • rab GTP-Binding Proteins / metabolism

Substances

  • Bicd2 protein, mouse
  • Carrier Proteins
  • Dynactin Complex
  • Membrane Proteins
  • Microtubule-Associated Proteins
  • Multiprotein Complexes
  • 1-Alkyl-2-acetylglycerophosphocholine Esterase
  • PAFAH1B1 protein, human
  • Dyneins
  • rab GTP-Binding Proteins