1QTX

THE 1.65 ANGSTROM STRUCTURE OF CALMODULIN RS20 PEPTIDE COMPLEX

• PDB DOI:  https://doi.org/10.2210/pdb1QTX/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Escherichia coli, Gallus gallus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-06-29 Released: 2003-06-24 
• Deposition Author(s): Weigand, S., Anderson, W.F.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.214 
• R-Value Work: 0.185 
• R-Value Observed: 0.185 

Literature

High Resolution Structure of a Calmodulin Rs20 Peptide Complex

Weigand, S., Shuvalova, L., Lukas, T.J., Mirzoeva, S., Watterson, D.M., Anderson, W.F.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 19.1 kDa 
• Atom Count: 1,826 
• Modelled Residue Count: 169 
• Deposited Residue Count: 169 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (CALMODULIN)	A	148	Escherichia coli	Mutation(s): 0
UniProt
Find proteins for A0MMD0 (Hordeum vulgare) Explore A0MMD0  Go to UniProtKB:  A0MMD0

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (RS20)	B	21	N/A	Mutation(s): 0
UniProt
Find proteins for P11799 (Gallus gallus) Explore P11799  Go to UniProtKB:  P11799

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.214 
• R-Value Work: 0.185 
• R-Value Observed: 0.185 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.046	α = 90
b = 55.344	β = 90
c = 41.528	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-06-24 
Deposition Author(s): Weigand, S., Anderson, W.F.

Revision History  

• Version 1.0: 2003-06-24
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-16
  Changes: Data collection, Database references, Derived calculations, Refinement description