1QS7

The 1.8 angstrom structure of calmodulin rs20 peptide complex

• PDB DOI: https://doi.org/10.2210/pdb1QS7/pdb

• Classification: METAL BINDING PROTEIN/PEPTIDE
• Organism(s): Escherichia coli, Gallus gallus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1999-06-25 Released: 2003-06-24 
• Deposition Author(s): Weigand, S., Anderson, W.F.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 
  0.259 (Depositor), 0.260 (DCC) 
• R-Value Work: 
  0.228 (Depositor), 0.220 (DCC) 
• R-Value Observed: 
  0.228 (Depositor) 

Starting Model: experimental

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)

Biological Assembly 2  

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 37.63 kDa 
• Atom Count: 2,859 
• Modelled Residue Count: 327 
• Deposited Residue Count: 332 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CALMODULIN	A, C	145	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
RS20	B, D	21	N/A	Mutation(s): 2  EC: 2.7.11.18
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	E [auth A], F [auth A], G [auth A], H [auth A], I [auth C], J [auth C], K [auth C], L [auth C]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
TRF	B, D	L-PEPTIDE LINKING	C12 H12 N2 O3		TRP

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free:  0.259 (Depositor), 0.260 (DCC) 
• R-Value Work:  0.228 (Depositor), 0.220 (DCC) 
• R-Value Observed: 0.228 (Depositor) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.016	α = 90
b = 54.481	β = 92.759
c = 66.304	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: 2021-11-03
  Changes: Database references, Derived calculations
• Version 1.4: 2023-08-16
  Changes: Data collection, Refinement description
• Version 1.5: 2024-11-13
  Changes: Structure summary