Lysobisphosphatidic acid (LBPA) (also known as bis(monoacylglycero)phosphate (BMP)) is a phospholipid that is found in the membranes of late endosomes and lysosomes of eukaryotic cells.
Phosphatidylglycerol is a precursor and structural isomer of LBPA.
[1] LBPA's stereochemistry is atypical among glycerophospholipids and influences its function within the LE/LY (late endosome/lysosome) system.
[1][2] LBPA makes up 15–20% of all LE/LY phospholipids and is not found in other subcellular membranes.
[3] LBPA is primarily found within the inner LE/LY membranes where they play a role in their structure and trafficking processes.