Previous studies have suggested that human salivary secretory leukocyte protease inhibitor (SLPI) inhibits HIV-1 by binding to a host cell surface protein of unknown identity. Using the yeast two-hybrid assay, we identified a gene sequence encoding a novel SLPI-binding protein (SLPI-BP). The 1.5-kb cDNA encodes a 318-amino acid protein with a predicted transmembrane segment near the C-terminus. Sequence analysis revealed that SLPI-BP is the human scramblase protein that is involved in the movement of membrane phospholipids. Co-expression of SLPI and SLPI-BP followed by an S-protein pulldown assay confirmed the specific interaction between these two proteins. Our data represent the first report for the identity of SLPI-BP. (C) 2000 Federation of European Biochemical Societies.
Tseng, C. C., & Tseng, C. P. (2000). Identification of a novel secretory leukocyte protease inhibitor-binding protein involved in membrane phospholipid movement. FEBS Letters, 475(3), 232–236. https://doi.org/10.1016/S0014-5793(00)01700-2