4BY5

Crystal structure of Drosophila Frq2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

The Guanine-Exchange Factor Ric8A Binds the Calcium Sensor Ncs-1 to Regulate Synapse Number and Probability of Release.

Romero-Pozuelo, J.Dason, J.S.Mansilla, A.Banos-Mateos, S.Sardina, J.L.Chaves-Sanjuan, A.Jurado-Gomez, J.Santana, E.Atwood, H.L.Hernandez-Hernandez, A.Sanchez-Barrena, M.Ferrus, A.

(2014) J Cell Sci 127: 4246

  • DOI: 10.1242/jcs.152603
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The conserved Ca(2+)-binding protein Frequenin (homolog of the mammalian NCS-1, neural calcium sensor) is involved in pathologies that result from abnormal synapse number and probability of neurotransmitter release per synapse. Both synaptic features ...

    The conserved Ca(2+)-binding protein Frequenin (homolog of the mammalian NCS-1, neural calcium sensor) is involved in pathologies that result from abnormal synapse number and probability of neurotransmitter release per synapse. Both synaptic features are likely to be co-regulated but the intervening mechanisms remain poorly understood. We show here that Drosophila Ric8a (a homolog of mammalian synembryn, which is also known as Ric8a), a receptor-independent activator of G protein complexes, binds to Frq2 but not to the virtually identical homolog Frq1. Based on crystallographic data on Frq2 and site-directed mutagenesis on Frq1, the differential amino acids R94 and T138 account for this specificity. Human NCS-1 and Ric8a reproduce the binding and maintain the structural requirements at these key positions. Drosophila Ric8a and Gαs regulate synapse number and neurotransmitter release, and both are functionally linked to Frq2. Frq2 negatively regulates Ric8a to control synapse number. However, the regulation of neurotransmitter release by Ric8a is independent of Frq2 binding. Thus, the antagonistic regulation of these two synaptic properties shares a common pathway, Frq2-Ric8a-Gαs, which diverges downstream. These mechanisms expose the Frq2-Ric8a interacting surface as a potential pharmacological target for NCS-1-related diseases and provide key data towards the corresponding drug design.


    Organizational Affiliation

    Department of Molecular, Cellular and Developmental Neurobiology, Institute Cajal, CSIC, Avenida Dr. Arce 37, Madrid 28002, Spain aferrus@cajal.csic.es.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FI18190P1A, B, C, D187Drosophila melanogasterMutation(s): 1 
Gene Names: Frq2Dmel\CG5907dNCS-1Frqfrqfrq2Frq2-RACG5907Dmel_CG5907
Find proteins for Q9VWX8 (Drosophila melanogaster)
Explore Q9VWX8 
Go to UniProtKB:  Q9VWX8
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download CCD File 
A, B, C, D
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download CCD File 
B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.22 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.214 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.984α = 90
b = 131.192β = 91.07
c = 56.71γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2014-12-17
    Changes: Database references