Abstract
A peptide (P-9) comprising amino acids 307 to 385 of bovine serum albumin induced the fusion of small unilamellar vesicles of phosphatidylcholine at low pH. Upon acidification P-9 exhibited a ultraviolet differential spectrum characteristic of hydrophilic exposure of chromophores. This conformational change, and the structure of P-9 composed of three amphiphilic helixes, suggested a general working hypothesis for the description of protein-induced membrane fusion.
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