2M0K

3D Structure of Calmodulin and Calmodulin Binding Domain of Rat Olfactory Cyclic Nucleotide-Gated Ion Channel


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:  
    2M0K, 2M0J

  • 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-gated ion channel (OLFp) was investigated by circular dichroism (CD), fluorescence, and NMR spectroscopy ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CalmodulinA148Homo sapiensMutation(s): 0 
Gene Names: 
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3...
CALM1CALMCAMCAM1CALM2CAM2CAMBCALM3CALML2CAM3CAMCCAMIII

Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
NIH Common Fund Data Resources
PHAROS:  P0DP23
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Peptide from Cyclic nucleotide-gated olfactory channelB28Rattus norvegicusMutation(s): 0 
Gene Names: Cnga2Cncg2
Find proteins for Q00195 (Rattus norvegicus)
Explore Q00195 
Go to UniProtKB:  Q00195
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 
  • OLDERADO: 2M0K Olderado

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

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

Revision History  (Full details and data files)

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