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Identification of Synaptic DGKθ Interactors That Stimulate DGKθ Activity

Authors
  • Barber, Casey N.1, 2
  • Goldschmidt, Hana L.2
  • Ma, Qianqian1
  • Devine, Lauren R.1
  • Cole, Robert N.1
  • Huganir, Richard L.2
  • Raben, Daniel M.1
  • 1 Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD , (United States)
  • 2 Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD , (United States)
Type
Published Article
Journal
Frontiers in Synaptic Neuroscience
Publisher
Frontiers Media S.A.
Publication Date
Apr 27, 2022
Volume
14
Identifiers
DOI: 10.3389/fnsyn.2022.855673
Source
Frontiers
Keywords
Disciplines
  • Synaptic Neuroscience
  • Original Research
License
Green

Abstract

Lipids and their metabolic enzymes are a critical point of regulation for the membrane curvature required to induce membrane fusion during synaptic vesicle recycling. One such enzyme is diacylglycerol kinase θ (DGKθ), which produces phosphatidic acid (PtdOH) that generates negative membrane curvature. Synapses lacking DGKθ have significantly slower rates of endocytosis, implicating DGKθ as an endocytic regulator. Importantly, DGKθ kinase activity is required for this function. However, protein regulators of DGKθ’s kinase activity in neurons have never been identified. In this study, we employed APEX2 proximity labeling and mass spectrometry to identify endogenous interactors of DGKθ in neurons and assayed their ability to modulate its kinase activity. Seven endogenous DGKθ interactors were identified and notably, synaptotagmin-1 (Syt1) increased DGKθ kinase activity 10-fold. This study is the first to validate endogenous DGKθ interactors at the mammalian synapse and suggests a coordinated role between DGKθ-produced PtdOH and Syt1 in synaptic vesicle recycling.

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