Plasma Membrane Phosphoinositide Organization by Protein Electrostatics

Nature. 2005 Dec 1;438(7068):605-11. doi: 10.1038/nature04398.

Abstract

Phosphatidylinositol 4,5-bisphosphate (PIP2), which comprises only about 1% of the phospholipids in the cytoplasmic leaflet of the plasma membrane, is the source of three second messengers, activates many ion channels and enzymes, is involved in both endocytosis and exocytosis, anchors proteins to the membrane through several structured domains and has other roles. How can a single lipid in a fluid bilayer regulate so many distinct physiological processes? Spatial organization might be the key to this. Recent studies suggest that membrane proteins concentrate PIP2 and, in response to local increases in intracellular calcium concentration, release it to interact with other biologically important molecules.

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
  • Calmodulin / metabolism
  • Cell Membrane / chemistry*
  • Cell Membrane / metabolism*
  • Intracellular Signaling Peptides and Proteins / metabolism
  • Membrane Proteins / chemistry*
  • Membrane Proteins / metabolism*
  • Myristoylated Alanine-Rich C Kinase Substrate
  • Phosphatidylinositols / metabolism*
  • Static Electricity

Substances

  • Calmodulin
  • Intracellular Signaling Peptides and Proteins
  • Membrane Proteins
  • Phosphatidylinositols
  • Myristoylated Alanine-Rich C Kinase Substrate