5A4X

The crystal structure of Arabidopsis thaliana CAR4 in complex with two calcium ions and Zn


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Calcium-Dependent Oligomerization of Car Proteins at Cell Membrane Modulates Aba Signaling.

Diaz, M.Sanchez-Barrena, M.J.Gonzalez-Rubio, J.M.Rodriguez, L.Fernandez, D.Antoni, R.Yunta, C.Belda-Palazon, B.Gonzalez-Guzman, M.Peirats-Llobet, M.Menendez, M.Boskovic, J.Marquez, J.A.Rodriguez, P.L.Albert, A.

(2016) Proc.Natl.Acad.Sci.USA 113: E396

  • DOI: 10.1073/pnas.1512779113
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Regulation of ion transport in plants is essential for cell function. Abiotic stress unbalances cell ion homeostasis, and plants tend to readjust it, regulating membrane transporters and channels. The plant hormone abscisic acid (ABA) and the second ...

    Regulation of ion transport in plants is essential for cell function. Abiotic stress unbalances cell ion homeostasis, and plants tend to readjust it, regulating membrane transporters and channels. The plant hormone abscisic acid (ABA) and the second messenger Ca(2+) are central in such processes, as they are involved in the regulation of protein kinases and phosphatases that control ion transport activity in response to environmental stimuli. The identification and characterization of the molecular mechanisms underlying the effect of ABA and Ca(2+) signaling pathways on membrane function are central and could provide opportunities for crop improvement. The C2-domain ABA-related (CAR) family of small proteins is involved in the Ca(2+)-dependent recruitment of the pyrabactin resistance 1/PYR1-like (PYR/PYL) ABA receptors to the membrane. However, to fully understand CAR function, it is necessary to define a molecular mechanism that integrates Ca(2+) sensing, membrane interaction, and the recognition of the PYR/PYL interacting partners. We present structural and biochemical data showing that CARs are peripheral membrane proteins that functionally cluster on the membrane and generate strong positive membrane curvature in a Ca(2+)-dependent manner. These features represent a mechanism for the generation, stabilization, and/or specific recognition of membrane discontinuities. Such structures may act as signaling platforms involved in the recruitment of PYR/PYL receptors and other signaling components involved in cell responses to stress.


    Organizational Affiliation

    Instituto de Química Física Rocasolano, Consejo Superior de Investigaciones Científicas, ES-28006 Madrid, Spain;




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AT3G17980
A
177Arabidopsis thalianaMutation(s): 0 
Gene Names: CAR4 (C2, GAP1)
Find proteins for Q9LVH4 (Arabidopsis thaliana)
Go to UniProtKB:  Q9LVH4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
AT3G17980
B
177Arabidopsis thalianaMutation(s): 0 
Gene Names: CAR4 (C2, GAP1)
Find proteins for Q9LVH4 (Arabidopsis thaliana)
Go to UniProtKB:  Q9LVH4
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A, B
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 35.121α = 90.00
b = 88.645β = 90.00
c = 110.090γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
PHENIXrefinement
XDSdata reduction
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2015-06-15 
  • Released Date: 2016-03-02 
  • Deposition Author(s): Diaz, M., Albert, A.

Revision History 

  • Version 1.0: 2016-03-02
    Type: Initial release