title: Phosphorylated syntaxin 1 is localized to discrete domains along a subset of axons.
abstract: Syntaxin 1 is a SNARE protein that plays a central role in synaptic vesicle (SV) exocytosis. We generated an antibody that specifically recognizes a casein kinase II-mediated phosphorylation on serine-14 of syntaxin 1. In this report we show that this phosphorylation occurs in vivo and is developmentally regulated in the rat brain, rising to a level of 40% of the total syntaxin in adult animals. Phosphorylated syntaxin is preferentially associated with SNAP-25 and localizes to discrete domains of the axonal plasma membrane that do not colocalize with pools of synaptic vesicles. These phosphosyntaxin domains may define fusion sites for a novel class of vesicles outside classical active zones.
authors.affiliation: Howard Hughes Medical Institute, Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, California 94305-5428, USA.
authors.forename: D L
authors.initials: DL
authors.lastname: Foletti
authors.forename: R
authors.initials: R
authors.lastname: Lin
authors.forename: M A
authors.initials: MA
authors.lastname: Finley
authors.forename: R H
authors.initials: RH
authors.lastname: Scheller
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000906:Antibodies; D000918:Antibody Specificity; D000954:Antigens, Surface / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D001369:Axons / Q000378:metabolism* / Q000648:ultrastructure; D001921:Brain / Q000378:metabolism* / Q000648:ultrastructure; D001923:Brain Chemistry; D047390:Casein Kinase II; D007091:Image Processing, Computer-Assisted; D009419:Nerve Tissue Proteins / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D010766:Phosphorylation; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism; D051381:Rats; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D050827:Syntaxin 1
chemical_list: D000906:Antibodies; D000954:Antigens, Surface; D009419:Nerve Tissue Proteins; D011994:Recombinant Proteins; C494213:Stx1a protein, rat; D050827:Syntaxin 1; D047390:Casein Kinase II; D017346:Protein Serine-Threonine Kinases