1DEG

THE LINKER OF DES-GLU84 CALMODULIN IS BENT AS SEEN IN THE CRYSTAL STRUCTURE

• PDB DOI: https://doi.org/10.2210/pdb1DEG/pdb

• Classification: CALCIUM-BINDING PROTEIN
• Organism(s): Bos taurus
• Mutation(s): No 


• Deposited: 1993-06-07 Released: 1994-05-31 
• Deposition Author(s): Raghunathan, S., Chandross, R., Cheng, B.P., Persechini, A., Sobottk, S.E., Kretsinger, R.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Work: 0.230 
• R-Value Observed: 0.230 

Literature

The linker of des-Glu84-calmodulin is bent.

Raghunathan, S., Chandross, R.J., Cheng, B.P., Persechini, A., Sobottka, S.E., Kretsinger, R.H.

(1993) Proc Natl Acad Sci U S A 90: 6869-6873

• PubMed: 8341712 
• DOI: https://doi.org/10.1073/pnas.90.14.6869
• Primary Citation of Related Structures:  
  1DEG


• PubMed Abstract: 
  

  The crystal structure of a mutant calmodulin (CaM) lacking Glu-84 has been refined to R = 0.23 using data measured to 2.9-A resolution. In native CaM the central helix is fully extended, and the molecule is dumbbell shaped. In contrast, the deletion of Glu-84 causes a bend of 95 degrees in the linker region of the central helix at Ile-85. However, EF-hand domains 1 and 2 (lobe 1,2) do not touch lobe 3,4. The length, by alpha-carbon separation, of des-Glu84-CaM is 56 A; that of native CaM is 64 A. The shape of des-Glu84-CaM is similar to that of native CaM, as it is bound to the target peptide of myosin light-chain kinase. This result supports the proposal that the linker region of the central helix of CaM functions as a flexible tether.

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Organizational Affiliation: 

Department of Biology, University of Virginia, Charlottesville 22901.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 16.19 kDa 
• Atom Count: 146 
• Modelled Residue Count: 142 
• Deposited Residue Count: 142 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CALMODULIN	A	142	Bos taurus	Mutation(s): 0
UniProt
Find proteins for P62157 (Bos taurus) Explore P62157  Go to UniProtKB:  P62157

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CA	B [auth A], C [auth A], D [auth A], E [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Work: 0.230 
• R-Value Observed: 0.230 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.3	α = 90
b = 49.9	β = 90
c = 62.4	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-05-31 
Deposition Author(s): Raghunathan, S., Chandross, R., Cheng, B.P., Persechini, A., Sobottk, S.E., Kretsinger, R.H.

Revision History  

• Version 1.0: 1994-05-31
  Type: Initial release
  
• Version 1.1: 2008-03-03
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-02-07
  Changes: Data collection, Database references, Derived calculations, Other