title: The cysteine residue responsible for the release of fibroblast growth factor-1 residues in a domain independent of the domain for phosphatidylserine binding.
abstract: Fibroblast growth factor (FGF)-1 lacks a classical signal sequence to direct its secretion yet utilizes high affinity cell surface receptors to signal its heparin-dependent angiogenic and neurotrophic activities. We have previously reported that FGF-1 is released in response to temperature stress as a latent homodimer through a pathway that is potentiated by the Golgi inhibitor, brefeldin A (Jackson, A., Tarantini, F., Gamble, S., Friedman, S., and Maciag, T. (1995) J. Biol. Chem. 270, 33-36). In an attempt to further characterize this unconventional secretion mechanism, we sought to define the Cys residue(s) critical for FGF-1 dimer formation and release and to determine whether FGF-1 can associate with known phospholipid components of organelle or plasma membranes, which may be disturbed by brefeldin A. Utilizing FGF-1 Cys mutants, we were able to demonstrate that residue Cys30 is critical for FGF-1 release in response to heat shock. In addition, using solid phase phospholipid binding assays we demonstrate that FGF-1 is able to specifically associate with phosphatidylserine (PS). Heparin inhibits the association between FGF-1 and PS, and synthetic peptide competition assays suggest that the PS-binding domain of FGF-1 lies between residues 114 and 137. These observations indicate that FGF-1 may be able to associate with the PS component of organelle and/or plasma membranes and that the domains responsible for FGF-1 homodimer formation and PS binding are structurally distinct.
mesh_terms: D016475:3T3 Cells; D000595:Amino Acid Sequence; D000818:Animals; D003545:Cysteine / Q000378:metabolism*; D016220:Fibroblast Growth Factor 1 / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D051379:Mice; D008969:Molecular Sequence Data; D010718:Phosphatidylserines / Q000378:metabolism*; D014162:Transfection
chemical_list: D010718:Phosphatidylserines; D016220:Fibroblast Growth Factor 1; D003545:Cysteine