2M0J

3D Structure of Calmodulin and Calmodulin binding domain of Olfactory cyclic nucleotide-gated ion channel complex


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Binding orientation and specificity of calmodulin to rat olfactory cyclic nucleotide-gated ion channel

Irene, D.Huang, J.W.Chung, T.Y.Li, F.Y.Tzen, J.T.Lin, T.H.Chyan, C.L.

(2013) J.Biomol.Struct.Dyn. 31: 414-425

  • DOI: 10.1080/07391102.2012.703069
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Calmodulin (CaM), the primary intracellular Ca(2+) receptor, regulates a large number of key enzymes and controls a wide spectrum of important biological responses. Recognition between CaM and its target sequence in rat olfactory cyclic nucleotide-ga ...

    Calmodulin (CaM), the primary intracellular Ca(2+) receptor, regulates a large number of key enzymes and controls a wide spectrum of important biological responses. Recognition between CaM and its target sequence in rat olfactory cyclic nucleotide-gated ion channel (OLFp) was investigated by circular dichroism (CD), fluorescence, and NMR spectroscopy. Fluorescence data showed the OLFp tightly bound to CaM with a dissociation constant of 12 nM in a 1:1 stoichiometry. Far-UV CD data showed that approximately 60% of OLFp residues formed α-helical structures when associated with CaM. NMR data showed that most of the (15)N-(1)H HSQC cross-peaks of the (15)N-labeled CaM not only shifted but also split into two sets of peaks upon association with the OLFp. Our data indicated that the two distinct CaM/OLFp complexes existed simultaneously with stable structures that were not interexchangeable within the NMR time scale. In light of the palindromic sequence of OLFp (FQRIVRLVGVIRDW) for CaM targeting, we proposed that the helical OLFp with C2 symmetry may bind to CaM in two orientations. This hypothesis is supported by the observation that only one set of (15)N-(1)H HSQC cross-peaks of the (15)N-labeled CaM was detected upon association with OLFp-M13 chimeric peptide (OLFMp), a mutated OLFp lacking the palindromic feature. The binding specificity of OLFMp to CaM was restored when the palindromic feature was destroyed. Binding modes of CaM/OLFp and CaM/OLFMp simulated by molecular docking were in accord with their distinct patterns observed in HSQC spectra. Our studies suggest that the palindromic residues in OLFp are crucial for the orientation-specific recognition by CaM.


    Related Citations: 
    • Resonance assignments and secondary structure of calmodulin in complex with its target sequence in rat olfactory cyclic nucleotide-gated ion channel
      Irene, D.,Sung, F.H.,Huang, J.W.,Lin, T.H.,Chen, Y.C.,Chyan, C.L.
      (2014) Biomol.Nmr Assign. 8: 97


    Organizational Affiliation

    Department of Chemistry, National Dong Hwa University, Hualien 974, Taiwan, ROC.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Calmodulin
A
148Homo sapiensMutation(s): 0 
Gene Names: CALM3 (CALML2, CAM3, CAMC, CAMIII)
Find proteins for P0DP25 (Homo sapiens)
Go to Gene View: CALM3
Go to UniProtKB:  P0DP25
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Peptide from Cyclic nucleotide-gated olfactory channel
B
28Rattus norvegicusMutation(s): 0 
Gene Names: Cnga2 (Cncg2)
Find proteins for Q00195 (Rattus norvegicus)
Go to UniProtKB:  Q00195
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2012-10-29 
  • Released Date: 2013-10-30 
  • Deposition Author(s): Deli, I., Chyan, C.

Revision History 

  • Version 1.0: 2013-10-30
    Type: Initial release
  • Version 1.1: 2015-02-11
    Type: Database references