Structures of vertebrate Patched and Smoothened reveal intimate links between cholesterol and Hedgehog signalling

Curr Opin Struct Biol. 2019 Aug:57:204-214. doi: 10.1016/j.sbi.2019.05.015. Epub 2019 Jun 24.

Abstract

The Hedgehog (HH) signalling pathway is a cell-cell communication system that controls the patterning of multiple tissues during embryogenesis in metazoans. In adults, HH signals regulate tissue stem cells and regenerative responses. Abnormal signalling can cause birth defects and cancer. The HH signal is received on target cells by Patched (PTCH1), the receptor for HH ligands, and then transmitted across the plasma membrane by Smoothened (SMO). Recent structural and biochemical studies have pointed to a sterol lipid, likely cholesterol itself, as the elusive second messenger that communicates the HH signal between PTCH1 and SMO, thus linking ligand reception to transmembrane signalling.

Publication types

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

MeSH terms

  • Animals
  • Cholesterol / metabolism*
  • Hedgehog Proteins / metabolism*
  • Humans
  • Patched Receptors / chemistry*
  • Patched Receptors / metabolism*
  • Signal Transduction*
  • Smoothened Receptor / chemistry*
  • Smoothened Receptor / metabolism*
  • Spine

Substances

  • Hedgehog Proteins
  • Patched Receptors
  • Smoothened Receptor
  • Cholesterol