Lateral diffusion of human histocompatibility antigens in isolated plasma membranes

Ya xian Su, Shin Lin, Michael Edidin

Research output: Contribution to journalArticle

Abstract

We have prepared large (5-10 μm) plasma membrane fragments by lysis of VA-2, human, cells adherent to Sephadex beads. The membrane fragments may be removed from beads by sonication and stained with fluorescent antibodies to human histocompatibility antigens, HLA antigens. Lateral diffusion of labelled antigens is followed by the method of fluorescence photobleaching recovery (FPR). HLA antigens of isolated membranes diffuse at the same rate, approx. (2-4) · 10-10 cm2 · s-1 as they do in intact cells. This rate may be modified by incubating membranes in a variety of media. Buffers of slightly acid pH (6.5 or less) enhance lateral diffusion, while the presence of divalent ions slightly reduces diffusion rates. Our major finding is that incubation of 37° in 0.10 M phosphate buffer increases lateral diffusion 3-5-fold.

Original languageEnglish (US)
Pages (from-to)92-96
Number of pages5
JournalBBA - Biomembranes
Volume776
Issue number1
DOIs
StatePublished - Sep 19 1984

Keywords

  • Cell fractionation
  • Fluorescence photobleaching recovery
  • Histocompatibility antigen
  • Lateral diffusion
  • Plasma membrane

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology

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