2YOA

Synaptotagmin-1 C2B domain with phosphoserine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.184 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Phosphatidylinositol 4,5-Bisphosphate Clusters Act as Molecular Beacons for Vesicle Recruitment

Honigmann, A.Van Den Bogaart, G.Iraheta, E.Risselada, H.J.Milovanovic, D.Mueller, V.Muellar, S.Diederichsen, U.Fasshauer, D.Grubmuller, H.Hell, S.W.Eggeling, C.Kuhnel, K.Jahn, R.

(2013) Nat Struct Mol Biol 20: 679

  • DOI: 10.1038/nsmb.2570
  • Primary Citation of Related Structures:  
    2YOA

  • PubMed Abstract: 
  • Synaptic-vesicle exocytosis is mediated by the vesicular Ca(2+) sensor synaptotagmin-1. Synaptotagmin-1 interacts with the SNARE protein syntaxin-1A and acidic phospholipids such as phosphatidylinositol 4,5-bisphosphate (PIP2). However, it is unclear how ...

    Synaptic-vesicle exocytosis is mediated by the vesicular Ca(2+) sensor synaptotagmin-1. Synaptotagmin-1 interacts with the SNARE protein syntaxin-1A and acidic phospholipids such as phosphatidylinositol 4,5-bisphosphate (PIP2). However, it is unclear how these interactions contribute to triggering membrane fusion. Using PC12 cells from Rattus norvegicus and artificial supported bilayers, we show that synaptotagmin-1 interacts with the polybasic linker region of syntaxin-1A independent of Ca(2+) through PIP2. This interaction allows both Ca(2+)-binding sites of synaptotagmin-1 to bind to phosphatidylserine in the vesicle membrane upon Ca(2+) triggering. We determined the crystal structure of the C2B domain of synaptotagmin-1 bound to phosphoserine, allowing development of a high-resolution model of synaptotagmin bridging two different membranes. Our results suggest that PIP2 clusters organized by syntaxin-1 act as molecular beacons for vesicle docking, with the subsequent Ca(2+) influx bringing the vesicle membrane close enough for membrane fusion.


    Organizational Affiliation

    Department of Nanobiophotonics, Max Planck Institute for Biophysical Chemistry, Göttingen, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SYNAPTOTAGMIN-1 AB152Rattus norvegicusMutation(s): 0 
Gene Names: Syt1
Find proteins for P21707 (Rattus norvegicus)
Explore P21707 
Go to UniProtKB:  P21707
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.183 
  • R-Value Observed: 0.184 
  • Space Group: P 4 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97α = 90
b = 97β = 90
c = 89.01γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
BALBESphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-20
    Type: Initial release
  • Version 1.1: 2013-05-15
    Changes: Database references
  • Version 1.2: 2013-05-29
    Changes: Database references
  • Version 1.3: 2013-06-19
    Changes: Database references
  • Version 1.4: 2017-08-23
    Changes: Data collection