Interaction of syntaxin with alpha-fodrin, a major component of the submembranous cytoskeleton.
The soluble N-ethyl maleimide-sensitive factor attachment protein receptor machinery is involved in membrane docking and fusion. In this machinery, the syntaxin family is a central coordinator and participates in multiple protein-protein interactions. In this study we have shown that alpha-fodrin, nonerythroid spectrin, is a new binding partner of the syntaxin family. alpha-Fodrin bound to syntaxin-1a, -3, and -4, all of which are localized on the plasma membrane. Syntaxin-3 interacted with alpha-fodrin in dose-dependent and saturable manners but not with alpha-spectrin, erythroid spectrin. Syntaxin-3 interacted with alpha-fodrin through its C-terminal coiled-coil region. Binding of Munc18 or SNAP-25 to syntaxin-1a inhibited the interaction of alpha-fodrin with syntaxin-1a. Available evidence indicates that alpha-fodrin is implicated in exocytosis, but a precise mode of action of alpha-fodrin in exocytosis remains unclear. Our results suggest that alpha-fodrin regulates exocytosis through the interaction with members of the syntaxin family.
Nakano
M
M
Division of Molecular and Cell Biology, Institute for Medical Science, Dokkyo University School of Medicine, 880, Kitakobayashi, Mibu-machi, Tochigi 321-0293, Japan.
Nogami
S
S
Sato
S
S
Terano
A
A
Shirataki
H
H
D000818:Animals; D001665:Binding Sites; D002352:Carrier Proteins / Q000302:isolation & purification / Q000378:metabolism*; D002478:Cells, Cultured; D003599:Cytoskeleton / Q000378:metabolism*; D004285:Dogs; D005089:Exocytosis / Q000502:physiology; D008565:Membrane Proteins / Q000378:metabolism*; D008840:Microfilament Proteins / Q000302:isolation & purification / Q000378:metabolism*; D051938:Munc18 Proteins; D009419:Nerve Tissue Proteins / Q000378:metabolism; D011506:Proteins / Q000378:metabolism; D050765:Qa-SNARE Proteins; D050825:Synaptosomal-Associated Protein 25; D033921:Vesicular Transport Proteins; D013049:Spectrin
D002352:Carrier Proteins; D008565:Membrane Proteins; D008840:Microfilament Proteins; D051938:Munc18 Proteins; D009419:Nerve Tissue Proteins; D011506:Proteins; D050765:Qa-SNARE Proteins; D050825:Synaptosomal-Associated Protein 25; D033921:Vesicular Transport Proteins; D013049:Spectrin