Endosomal phosphatidylserine is critical for the YAP signalling pathway in proliferating cells

Nat Commun. 2017 Nov 1;8(1):1246. doi: 10.1038/s41467-017-01255-3.

Abstract

Yes-associated protein (YAP) is a recently discovered growth-promoting transcription coactivator that has been shown to regulate the malignancy of various cancers. How YAP is regulated is not fully understood. Here, we show that one of the factors regulating YAP is phosphatidylserine (PS) in recycling endosomes (REs). We use proximity biotinylation to find proteins proximal to PS. Among these proteins are YAP and multiple proteins related to YAP signalling. Knockdown of ATP8A1 (an RE PS-flippase) or evectin-2 (an RE-resident protein) and masking of PS in the cytoplasmic leaflet of membranes, all suppress nuclear localization of YAP and YAP-dependent transcription. ATP8A1 knockdown increases the phosphorylated (activated) form of Lats1 that phosphorylates and inactivates YAP, whereas evectin-2 knockdown reduces the ubiquitination and increased the level of Lats1. The proliferation of YAP-dependent metastatic cancer cells is suppressed by knockdown of ATP8A1 or evectin-2. These results suggest a link between a membrane phospholipid and cell proliferation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptor Proteins, Signal Transducing / metabolism*
  • Adenosine Triphosphatases / genetics*
  • Animals
  • Biotinylation
  • COS Cells
  • Cell Nucleus / metabolism
  • Cell Proliferation
  • Chlorocebus aethiops
  • Endosomes / metabolism
  • Gene Knockdown Techniques
  • HEK293 Cells
  • Humans
  • Membrane Proteins / genetics*
  • Phosphatidylserines / metabolism*
  • Phospholipid Transfer Proteins / genetics*
  • Phosphoproteins / metabolism*
  • Phosphorylation
  • Protein Serine-Threonine Kinases / metabolism*
  • Protein Transport / genetics
  • Signal Transduction
  • Transcription Factors
  • Ubiquitination
  • YAP-Signaling Proteins

Substances

  • Adaptor Proteins, Signal Transducing
  • Membrane Proteins
  • PLEKHB2 protein, human
  • Phosphatidylserines
  • Phospholipid Transfer Proteins
  • Phosphoproteins
  • Transcription Factors
  • YAP-Signaling Proteins
  • YAP1 protein, human
  • LATS1 protein, human
  • Protein Serine-Threonine Kinases
  • ATP8A1 protein, human
  • Adenosine Triphosphatases