An essential role for a phospholipid transfer protein in yeast Golgi function

Nature. 1990 Oct 11;347(6293):561-2. doi: 10.1038/347561a0.


Progression of proteins through the secretory pathway of eukaryotic cells involves a continuous rearrangement of macromolecular structures made up of proteins and phospholipids. The protein SEC14p is essential for transport of proteins from the yeast Golgi complex. Independent characterization of the SEC14 gene and the PIT1 gene, which encodes a phosphatidylinositol/phosphatidylcholine transfer protein in yeast, indicated that these two genes are identical. Phospholipid transfer proteins are a class of cytosolic proteins that are ubiquitous among eukaryotic cells and are distinguished by their ability to catalyse the exchange of phospholipids between membranes in vitro. We show here that the SEC14 and PIT1 genes are indeed identical and that the growth phenotype of a sec14-1ts mutant extends to the inability of its transfer protein to effect phospholipid transfer in vitro. These results therefore establish for the first time an in vivo function for a phospholipid transfer protein, namely a role in the compartment-specific stimulation of protein secretion.

Publication types

  • Comparative Study

MeSH terms

  • Carrier Proteins / genetics
  • Carrier Proteins / metabolism*
  • Carrier Proteins / physiology*
  • Endoplasmic Reticulum / metabolism
  • Fungal Proteins / genetics
  • Fungal Proteins / metabolism*
  • Genes, Fungal
  • Golgi Apparatus / physiology*
  • Introns
  • Membrane Proteins / genetics
  • Membrane Proteins / physiology*
  • Mutation
  • Phenotype
  • Phosphatidylcholines / metabolism
  • Phosphatidylinositols / metabolism
  • Phospholipid Transfer Proteins
  • Plasmids
  • Saccharomyces cerevisiae / genetics
  • Saccharomyces cerevisiae / ultrastructure*
  • Saccharomyces cerevisiae Proteins*
  • Sequence Homology, Nucleic Acid
  • Temperature
  • Transfection


  • Carrier Proteins
  • Fungal Proteins
  • Membrane Proteins
  • Phosphatidylcholines
  • Phosphatidylinositols
  • Phospholipid Transfer Proteins
  • SEC14 protein, S cerevisiae
  • SEC24 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins