Macromolecule Content

• Total Structure Weight: 8534.51 
• Atom Count: 589 
• Residue Count: 76 
• Unique protein chains: 1

1J7O

Solution structure of Calcium-calmodulin N-terminal domain

• DOI: 10.2210/pdb1J7O/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2001-05-17 Released: 2001-11-07 
• Deposition Author(s): Chou, J.J., Klee, C.B., Bax, A.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 3 
• Conformers Submitted: 3 
• Selection Criteria: structure with lowest dipolar energy 

Literature

Solution structure of Ca(2+)-calmodulin reveals flexible hand-like properties of its domains.

Chou, J.J., Li, S., Klee, C.B., Bax, A.

(2001) Nat.Struct.Mol.Biol. 8: 990-997

• PubMed: 11685248 
• DOI: 10.1038/nsb1101-990
• Primary Citation of Related Structures:  
  1J7P


• PubMed Abstract: 
  

The solution structure of Ca(2+)-ligated calmodulin is determined from residual dipolar couplings measured in a liquid crystalline medium and from a large number of heteronuclear J couplings for defining side chains. Although the C-terminal domain solution structure is similar to the X-ray crystal structure, the EF hands of the N-terminal domain are considerably less open. The substantial differences in interhelical angles correspond to negligible changes in short interproton distances and, therefore, cannot be identified by comparison of NOEs and X-ray data. NOE analysis, however, excludes a two-state equilibrium in which the closed apo conformation is partially populated in the Ca(2+)-ligated state. The difference between the crystal and solution structures of Ca(2+)-calmodulin indicates considerable backbone plasticity within the domains of calmodulin, which is key to their ability to bind a wide range of targets. In contrast, the vast majority of side chains making up the target binding surface are locked into the same chi(1) rotameric states as in complexes with target peptide.

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Organizational Affiliation: 

Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Calmodulin	A	76	Homo sapiens	Mutation(s): 0  Gene Names: CALM2 (CAM2, CAMB)
Find proteins for P0DP24 (Homo sapiens) Go to Gene View: CALM2 Go to UniProtKB:  P0DP24

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CA	A	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 3 
• Conformers Submitted: 3 
• Selection Criteria: structure with lowest dipolar energy 
• Olderado: 1J7O Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-05-17 
• Released Date: 2001-11-07 
• Deposition Author(s): Chou, J.J., Klee, C.B., Bax, A.

Revision History 

• Version 1.0: 2001-11-07
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance