1K8T

Crystal structure of the adenylyl cyclase domain of anthrax edema factor (EF)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.229 

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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 mamm ...

    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
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CALMODULIN-SENSITIVE ADENYLATE CYCLASE A510Bacillus anthracisMutation(s): 0 
Gene Names: cya, pXO1-122, BXA0141, GBAA_pXO1_0142
EC: 4.6.1.1
Find proteins for P40136 (Bacillus anthracis)
Explore P40136 
Go to UniProtKB:  P40136
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.229 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.476α = 90
b = 203.604β = 90
c = 74.034γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • 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: Derived calculations, Version format compliance