1LVC

Crystal structure of the adenylyl cyclase domain of anthrax edema factor (EF) in complex with calmodulin and 2' deoxy, 3' anthraniloyl ATP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.281 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Physiological calcium concentrations regulate calmodulin binding and catalysis of adenylyl cyclase exotoxins

Shen, Y.Lee, Y.-S.Soelaiman, S.Bergson, P.Lu, D.Chen, A.Beckingham, K.Grabarek, Z.Mrksich, M.Tang, W.-J.

(2002) Embo J. 21: 6721-6732

  • Also Cited By: 1PK0

  • PubMed Abstract: 
  • Edema factor (EF) and CyaA are calmodulin (CaM)-activated adenylyl cyclase exotoxins involved in the pathogenesis of anthrax and whooping cough, respectively. Using spectroscopic, enzyme kinetic and surface plasmon resonance spectroscopy analyses, we ...

    Edema factor (EF) and CyaA are calmodulin (CaM)-activated adenylyl cyclase exotoxins involved in the pathogenesis of anthrax and whooping cough, respectively. Using spectroscopic, enzyme kinetic and surface plasmon resonance spectroscopy analyses, we show that low Ca(2+) concentrations increase the affinity of CaM for EF and CyaA causing their activation, but higher Ca(2+) concentrations directly inhibit catalysis. Both events occur in a physiologically relevant range of Ca(2+) concentrations. Despite the similarity in Ca(2+) sensitivity, EF and CyaA have substantial differences in CaM binding and activation. CyaA has 100-fold higher affinity for CaM than EF. CaM has N- and C-terminal globular domains, each binding two Ca(2+) ions. CyaA can be fully activated by CaM mutants with one defective C-terminal Ca(2+)-binding site or by either terminal domain of CaM while EF cannot. EF consists of a catalytic core and a helical domain, and both are required for CaM activation of EF. Mutations that decrease the interaction of the helical domain with the catalytic core create an enzyme with higher sensitivity to Ca(2+)-CaM activation. However, CyaA is fully activated by CaM without the domain corresponding to the helical domain of EF.


    Related Citations: 
    • Structural basis for the activation of anthrax adenylyl cyclase exotoxin by calmodulin
      Drum, C.L.,Yan, S.Z.,Bard, J.,Shen, Y.Q.,Lu, D.,Soelaiman, S.,Grabarek, Z.,Bohm, A.,Tang, W.J.
      (2002) Nature 415: 396


    Organizational Affiliation

    Ben-May Institute for Cancer Research, The University of Chicago, Chicago, IL 60637, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
calmodulin-sensitive adenylate cyclase
A, B, C
510Bacillus anthracisGene Names: cya
EC: 4.6.1.1
Find proteins for P40136 (Bacillus anthracis)
Go to UniProtKB:  P40136
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
calmodulin
D, E, F
149Homo sapiensGene Names: CALM1 (CALM, CAM, CAM1)
Find proteins for P0DP23 (Homo sapiens)
Go to Gene View: CALM1
Go to UniProtKB:  P0DP23
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DOT
Query on DOT

Download SDF File 
Download CCD File 
A, C
3'ANTHRANILOYL-2'-DEOXY-ADENOSINE-5'-TRIPHOSPHATE
C17 H21 N6 O13 P3
FIWKNPONGIOEHC-YNEHKIRRSA-N
 Ligand Interaction
YB
Query on YB

Download SDF File 
Download CCD File 
A, B, C
YTTERBIUM (III) ION
Yb
AWSFICBXMUKWSK-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
D, E, F
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DOTKd: 1000 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.281 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 116.924α = 90.00
b = 167.918β = 90.00
c = 341.743γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
CNSphasing
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-12-04
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance