The cytosolic N-terminus of CD317/tetherin is a membrane microdomain exclusion motif.

Peter G Billcliff, Orla Gorleku, Luke Chamberlain, George Banting

Research output: Contribution to journalArticle (Academic Journal)

Abstract

The integral membrane protein CD317/tetherin has been associated with a plethora of biological processes, including restriction of enveloped virus release, regulation of B cell growth, and organisation of membrane microdomains. CD317 possesses both a conventional transmembrane (TM) domain and a glycophosphatidylinositol (GPI) anchor. We confirm that the GPI anchor is
essential for CD317 to associate with membrane microdomains, and that the TM domain of CD44 is unable to rescue proper microdomain association of a ΔGPI CD317 construct. Additionally, we demonstrate that the cytosolic amino terminal region of CD317 can function as a ‘microdomain-excluding’ motif, when heterologously expressed as part of a reporter construct. Finally, we show that two recently described isoforms of CD317 do not differ in their affinity for membrane microdomains. Together, these data help further our understanding of the fundamental cell biology governing membrane microdomain association of CD317.
Original languageEnglish
JournalBiology Open
Publication statusAccepted/In press - 2013

Keywords

  • tetherin
  • membrane microdomain
  • lipid raft
  • palmitoylation

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    Billcliff, P. G., Gorleku, O., Chamberlain, L., & Banting, G. (Accepted/In press). The cytosolic N-terminus of CD317/tetherin is a membrane microdomain exclusion motif. Biology Open.