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An essential role for a phospholipid transfer protein in yeast Golgi function
V A Bankaitis1, J R Aitken, A E Cleves
1Department of Microbiology, University of Illinois, Urbana 61801.
Nature
|October 11, 1990
Summary
The SEC14 gene, identical to PIT1, encodes a phospholipid transfer protein crucial for yeast protein secretion. This study demonstrates its essential in vivo role in stimulating protein transport from the Golgi complex.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Protein transport through the secretory pathway requires dynamic lipid-protein rearrangements.
- The SEC14 gene product (SEC14p) is vital for protein transport from the yeast Golgi complex.
- Phospholipid transfer proteins (PLTPs) are cytosolic proteins facilitating lipid exchange between membranes.
Purpose of the Study:
- To confirm the identity of the SEC14 and PIT1 genes in yeast.
- To elucidate the in vivo function of a phospholipid transfer protein.
- To establish the role of SEC14p in protein secretion.
Main Methods:
- Genetic analysis of yeast mutants (sec14-1ts).
- Biochemical assays to assess phospholipid transfer activity in vitro.
- Characterization of gene identity through independent studies.
Main Results:
- The SEC14 and PIT1 genes were confirmed to be identical.
- A temperature-sensitive sec14-1ts mutant exhibited impaired phospholipid transfer activity in vitro.
- This impairment correlated with defects in protein transport from the Golgi.
Conclusions:
- SEC14p is a phospholipid transfer protein essential for protein secretion in vivo.
- PLTPs play a critical role in regulating compartment-specific protein transport.
- This work establishes the first in vivo function for a PLTP in stimulating protein secretion.