1VRK

THE 1.9 ANGSTROM STRUCTURE OF E84K-CALMODULIN RS20 PEPTIDE COMPLEX


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Analysis of the functional coupling between calmodulin's calcium binding and peptide recognition properties.

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

(1999) Biochemistry 38: 3936-3947

  • DOI: 10.1021/bi9821263

  • PubMed Abstract: 
  • The enhancement of calmodulin's (CaM) calcium binding activity by an enzyme or a recognition site peptide and its diminution by key point mutations at the protein recognition interface (e.g., E84K-CaM), which is more than 20 A away from the nearest c ...

    The enhancement of calmodulin's (CaM) calcium binding activity by an enzyme or a recognition site peptide and its diminution by key point mutations at the protein recognition interface (e.g., E84K-CaM), which is more than 20 A away from the nearest calcium ligation structure, can be described by an expanded version of the Adair-Klotz equation for multiligand binding. The expanded equation can accurately describe the calcium binding events and their variable linkage to protein recognition events can be extended to other CaM-regulated enzymes and can potentially be applied to a diverse array of ligand binding systems with allosteric regulation of ligand binding, whether by other ligands or protein interaction. The 1.9 A resolution X-ray crystallographic structure of the complex between E84K-CaM and RS20 peptide, the CaM recognition site peptide from vertebrate smooth muscle and nonmuscle forms of myosin light chain kinase, provides insight into the structural basis of the functional communication between CaM's calcium ligation structures and protein recognition surfaces. The structure reveals that the complex adapts to the effect of the functional mutation by discrete adjustments in the helix that contains E84. This helix is on the amino-terminal side of the helix-loop-helix structural motif that is the first to be occupied in CaM's calcium binding mechanism. The results reported here are consistent with a sequential and cooperative model of CaM's calcium binding activity in which the two globular and flexible central helix domains are functionally linked, and provide insight into how CaM's calcium binding activity and peptide recognition properties are functionally coupled.


    Related Citations: 
    • Target Enzyme Recognition by Calmodulin: 2.4 A Structure of a Calmodulin-Peptide Complex
      Meador, W.E.,Means, A.R.,Quiocho, F.A.
      (1992) Science 257: 1251


    Organizational Affiliation

    Department of Molecular Pharmacology, Biological Chemistry and Drug Discovery Program, Northwestern University, Chicago, Illinois 60611, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CALMODULIN
A
148N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
RS20
B
21Gallus gallusMutation(s): 0 
Gene Names: Mylk
EC: 2.7.11.18
Find proteins for P11799 (Gallus gallus)
Go to UniProtKB:  P11799
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
NH2
Query on NH2
B
NON-POLYMERH2 N

--

TRF
Query on TRF
B
L-PEPTIDE LINKINGC12 H12 N2 O3TRP
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 61.209α = 90.00
b = 40.560β = 91.70
c = 32.774γ = 90.00
Software Package:
Software NamePurpose
SDMSdata scaling
X-PLORmodel building
X-PLORphasing
SDMSdata reduction
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-04-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance