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Biological Chemistry

Editor-in-Chief: Brüne, Bernhard

Editorial Board Member: Buchner, Johannes / Ludwig, Stephan / Sies, Helmut / Turk, Boris / Wittinghofer, Alfred

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Localization of Lysobisphosphatidic Acid-Rich Membrane Domains in Late Endosomes

Toshihide Kobayashi / Konstantin Startchev / Andrew J. Whitney / Jean Gruenberg

Citation Information: Biological Chemistry. Volume 382, Issue 3, Pages 483–485, ISSN (Print) 1431-6730, DOI: 10.1515/BC.2001.059, June 2005

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Late endosomes accumulate internal membranes within the lumen of the organelle. These internal membranes are enriched in the late endosome specific phospholipid, lysobisphosphatidic acid (LBPA). The organization of LBPArich membrane domains is not well characterized. Using an LBPAspecific monoclonal antibody (6C4), we show that these membrane domains are not accessible from the cytoplasm. Using fluorescence correlation spectroscopy, we also show that 6C4 only binds sonicated, but not intact, late endosomes, presumably reflecting the release of internal membranes upon endosome rupture.

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