Role of C. elegans TAT-1 protein in maintaining plasma membrane phosphatidylserine asymmetry

Monica Darland-Ransom, Xiaochen Wang, Chun Ling Sun, James Mapes, Keiko Gengyo-Ando, Shohei Mitani, Ding Xue

Research output: Contribution to journalArticlepeer-review

105 Citations (Scopus)

Abstract

The asymmetrical distribution of phospholipids on the plasma membrane is critical for maintaining cell integrity and physiology and for regulating intracellular signaling and important cellular events such as clearance of apoptotic cells. How phospholipid asymmetry is established and maintained is not fully understood. We report that the Caenorhabditis elegans P-type adenosine triphosphatase homolog, TAT-1, is critical for maintaining cell surface asymmetry of phosphatidylserine (PS). In animals deficient in tat-1, PS is abnormally exposed on the cell surface, and normally living cells are randomly lost through a mechanism dependent on PSR-1, a PS-recognizing phagocyte receptor, and CED-1, which contributes to recognition and engulfment of apoptotic cells. Thus, tat-1 appears to function in preventing appearance of PS in the outer leaflet of plasma membrane, and ectopic exposure of PS on the cell surface may result in removal of living cells by neighboring phagocytes.

Original languageEnglish
Pages (from-to)528-531
Number of pages4
JournalScience
Volume320
Issue number5875
DOIs
Publication statusPublished - 2008 Apr 25
Externally publishedYes

ASJC Scopus subject areas

  • General

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