RRC ID 76728
Author Kinugasa Y, Hirano Y, Sawai M, Ohno Y, Shindo T, Asakawa H, Chikashige Y, Shibata S, Kihara A, Haraguchi T, Hiraoka Y.
Title The very-long-chain fatty acid elongase Elo2 rescues lethal defects associated with loss of the nuclear barrier function in fission yeast cells.
Journal J Cell Sci
Abstract In eukaryotic cells, chromosomes are confined to the nucleus, which is compartmentalized by the nuclear membranes; these are continuous with the endoplasmic reticulum membranes. Maintaining the homeostasis of these membranes is an important cellular activity performed by lipid metabolic enzymes. However, how lipid metabolic enzymes affect nuclear membrane functions remains to be elucidated. We found that the very-long-chain fatty acid elongase Elo2 is located in the nuclear membrane and prevents lethal defects associated with nuclear membrane ruptures in mutants of the nuclear membrane proteins Lem2 and Bqt4 in the fission yeast Schizosaccharomyces pombe. Lipid composition analysis shows that t20:0/24:0 phytoceramide (a conjugate of C20:0 phytosphingosine and C24:0 fatty acid) is a major ceramide species in S. pombe The quantity of this ceramide is reduced in the absence of Lem2, and restored by increased expression of Elo2. Furthermore, loss of S. pombe Elo2 can be rescued by its human orthologs. These results suggest that the conserved very-long-chain fatty acid elongase producing the ceramide component is essential for nuclear membrane integrity and cell viability in eukaryotes.This article has an associated First Person interview with the first author of the paper.
Volume 132(10)
Published 2019-5-15
DOI 10.1242/jcs.229021
PII jcs.229021
PMID 30975915
MeSH Acetyltransferases / metabolism* Fatty Acid Elongases / metabolism* Humans Membrane Proteins / metabolism* Nuclear Envelope / metabolism* Saccharomyces cerevisiae Proteins / metabolism Schizosaccharomyces / metabolism* Schizosaccharomyces pombe Proteins / metabolism*
IF 4.573
Yeast BY23849 (BY4741)