1CNP

THE STRUCTURE OF CALCYCLIN REVEALS A NOVEL HOMODIMERIC FOLD FOR S100 CA2+-BINDING PROTEINS, NMR, 22 STRUCTURES

• PDB DOI: https://doi.org/10.2210/pdb1CNP/pdb
• BMRB: 4430

• Classification: CALCIUM-BINDING PROTEIN
• Organism(s): Oryctolagus cuniculus
• Mutation(s): No 


• Deposited: 1995-08-31 Released: 1996-10-14 
• Deposition Author(s): Potts, B.C.M., Smith, J., Akke, M., Macke, T.J., Okazaki, K., Hidaka, H., Case, D.A., Chazin, W.J.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Submitted: 22 

Literature

The structure of calcyclin reveals a novel homodimeric fold for S100 Ca(2+)-binding proteins.

Potts, B.C., Smith, J., Akke, M., Macke, T.J., Okazaki, K., Hidaka, H., Case, D.A., Chazin, W.J.

(1995) Nat Struct Biol 2: 790-796

• PubMed: 7552751 
• DOI: https://doi.org/10.1038/nsb0995-790
• Primary Citation of Related Structures:  
  1CNP


• PubMed Abstract: 
  

  The S100 calcium-binding proteins are implicated as effectors in calcium-mediated signal transduction pathways. The three-dimensional structure of the S100 protein calcyclin has been determined in solution in the apo state by NMR spectroscopy and a computational strategy that incorporates a systematic docking protocol. This structure reveals a symmetric homodimeric fold that is unique among calcium-binding proteins. Dimerization is mediated by hydrophobic contacts from several highly conserved residues, which suggests that the dimer fold identified for calcyclin will serve as a structural paradigm for the S100 subfamily of calcium-binding proteins.

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Organizational Affiliation: 

Department of Molecular Biology, Scripps Research Institute, La Jolla, California 92037, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 20.34 kDa 
• Atom Count: 1,426 
• Modelled Residue Count: 180 
• Deposited Residue Count: 180 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CALCYCLIN (RABBIT, APO)	A, B	90	Oryctolagus cuniculus	Mutation(s): 0
UniProt
Find proteins for P30801 (Oryctolagus cuniculus) Explore P30801  Go to UniProtKB:  P30801

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Submitted: 22 

Structure Validation

Entry History 

Deposition Data

• Released Date: 1996-10-14 
Deposition Author(s): Potts, B.C.M., Smith, J., Akke, M., Macke, T.J., Okazaki, K., Hidaka, H., Case, D.A., Chazin, W.J.

Revision History  

• Version 1.0: 1996-10-14
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-16
  Changes: Database references, Derived calculations, Other
• Version 1.4: 2024-05-22
  Changes: Data collection