1K93

Crystal structure of the adenylyl cyclase domain of anthrax edema factor (EF) in complex with calmodulin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.278 
  • R-Value Observed: 0.278 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

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: 396-402

  • DOI: 10.1038/415396a
  • Primary Citation of Related Structures:  
    1K8T, 1K93, 1K90

  • PubMed Abstract: 
  • Oedema factor, a calmodulin-activated adenylyl cyclase, is important in the pathogenesis of anthrax. Here we report the X-ray structures of oedema factor with and without bound calmodulin. Oedema factor shares no significant structural homology with mammalian adenylyl cyclases or other proteins ...

    Oedema factor, a calmodulin-activated adenylyl cyclase, is important in the pathogenesis of anthrax. Here we report the X-ray structures of oedema factor with and without bound calmodulin. Oedema factor shares no significant structural homology with mammalian adenylyl cyclases or other proteins. In the active site, 3'-deoxy-ATP and a single metal ion are well positioned for catalysis with histidine 351 as the catalytic base. This mechanism differs from the mechanism of two-metal-ion catalysis proposed for mammalian adenylyl cyclases. Four discrete regions of oedema factor form a surface that recognizes an extended conformation of calmodulin, which is very different from the collapsed conformation observed in other structures of calmodulin bound to effector peptides. On calmodulin binding, an oedema factor helical domain of relative molecular mass 15,000 undergoes a 15 A translation and a 30 degrees rotation away from the oedema factor catalytic core, which stabilizes a disordered loop and leads to enzyme activation. These allosteric changes provide the first molecular details of how calmodulin modulates one of its targets.


    Organizational Affiliation

    Ben-May Institute for Cancer Research, The University of Chicago, 924 East 57th Street, Chicago, Illinois 60637, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CALMODULIN-SENSITIVE ADENYLATE CYCLASEA, B, C510Bacillus anthracisMutation(s): 0 
Gene Names: cyapXO1-122BXA0141GBAA_pXO1_0142
EC: 4.6.1.1
UniProt
Find proteins for P40136 (Bacillus anthracis)
Explore P40136 
Go to UniProtKB:  P40136
Protein Feature View
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
CALMODULIND, E, F144Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
UniProt & NIH Common Fund Data Resources
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
PHAROS:  P0DP23
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.315 
  • R-Value Work: 0.278 
  • R-Value Observed: 0.278 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 116.73α = 90
b = 167.311β = 90
c = 344.296γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-01-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance