Dopey1-Mon2 complex binds to dual-lipids and recruits kinesin-1 for membrane trafficking

Nat Commun. 2019 Jul 19;10(1):3218. doi: 10.1038/s41467-019-11056-5.

Abstract

Proteins are transported among eukaryotic organelles along the cytoskeleton in membrane carriers. The mechanism regarding the motility of carriers and the positioning of organelles is a fundamental question in cell biology that remains incompletely understood. Here, we find that Dopey1 and Mon2 assemble into a complex and localize to the Golgi, endolysosome and endoplasmic reticulum exit site. The Golgi localization of Dopey1 and Mon2 requires their binding to phosphatidylinositol-4-phosphate and phosphatidic acid, respectively, two lipids known for the biogenesis of membrane carriers and the specification of organelle identities. The N-terminus of Dopey1 further interacts with kinesin-1, a plus-end or centrifugal-direction microtubule motor. Dopey1-Mon2 complex functions as a dual-lipid-regulated cargo-adaptor to recruit kinesin-1 to secretory and endocytic organelles or membrane carriers for centrifugally biased bidirectional transport. Dopey1-Mon2 complex therefore provides an important missing link to coordinate the budding of a membrane carrier and subsequent bidirectional transport along the microtubule.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cytoskeleton / metabolism
  • Endoplasmic Reticulum / metabolism
  • Endosomes / metabolism
  • Golgi Apparatus / metabolism
  • Kinesins / metabolism*
  • Lipids / chemistry*
  • Membranes / metabolism*
  • Microtubules / metabolism
  • Nerve Tissue Proteins / metabolism*
  • Phosphatidic Acids / metabolism
  • Phosphatidylinositol Phosphates / metabolism
  • Protein Binding
  • Protein Transport / physiology*
  • Proton-Translocating ATPases / metabolism*

Substances

  • DOP1A protein, human
  • Lipids
  • MON2 protein, human
  • Nerve Tissue Proteins
  • Phosphatidic Acids
  • Phosphatidylinositol Phosphates
  • phosphatidylinositol 4-phosphate
  • Proton-Translocating ATPases
  • Kinesins