1XFW

Crystal structure of anthrax edema factor (EF) in complex with calmodulin and 3'5' cyclic AMP (cAMP)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.266 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Calcium-independent calmodulin binding and two-metal-ion catalytic mechanism of anthrax edema factor.

Shen, Y.Zhukovskaya, N.L.Guo, Q.Florian, J.Tang, W.J.

(2005) EMBO J 24: 929-941

  • DOI: 10.1038/sj.emboj.7600574
  • Primary Citation of Related Structures:  
    1Y0V, 1XFV, 1XFU, 1XFZ, 1XFY, 1XFX, 1XFW

  • PubMed Abstract: 
  • Edema factor (EF), a key anthrax exotoxin, has an anthrax protective antigen-binding domain (PABD) and a calmodulin (CaM)-activated adenylyl cyclase domain. Here, we report the crystal structures of CaM-bound EF, revealing the architecture of EF PABD. CaM has N- and C-terminal domains and each domain can bind two calcium ions ...

    Edema factor (EF), a key anthrax exotoxin, has an anthrax protective antigen-binding domain (PABD) and a calmodulin (CaM)-activated adenylyl cyclase domain. Here, we report the crystal structures of CaM-bound EF, revealing the architecture of EF PABD. CaM has N- and C-terminal domains and each domain can bind two calcium ions. Calcium binding induces the conformational change of CaM from closed to open. Structures of the EF-CaM complex show how EF locks the N-terminal domain of CaM into a closed conformation regardless of its calcium-loading state. This represents a mechanism of how CaM effector alters the calcium affinity of CaM and uncouples the conformational change of CaM from calcium loading. Furthermore, structures of EF-CaM complexed with nucleotides show that EF uses two-metal-ion catalysis, a prevalent mechanism in DNA and RNA polymerases. A histidine (H351) further facilitates the catalysis of EF by activating a water to deprotonate 3'OH of ATP. Mammalian adenylyl cyclases share no structural similarity with EF and they also use two-metal-ion catalysis, suggesting the catalytic mechanism-driven convergent evolution of two structurally diverse adenylyl cyclases.


    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin-sensitive adenylate cyclaseA, B, C, D, E, F777Bacillus anthracisMutation(s): 0 
Gene Names: cyapXO1-122BXA0141GBAA_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
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin 2G [auth O], H [auth P], I [auth Q], J [auth R], K [auth S], L [auth T]149Homo sapiensMutation(s): 0 
Gene Names: CALM1CALMCAMCAM1
Find proteins for P0DP23 (Homo sapiens)
Explore P0DP23 
Go to UniProtKB:  P0DP23
NIH Common Fund Data Resources
PHAROS:  P0DP23
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CMP
Query on CMP

Download Ideal Coordinates CCD File 
N [auth A], P [auth B], R [auth C], T [auth D], V [auth E], X [auth F]ADENOSINE-3',5'-CYCLIC-MONOPHOSPHATE
C10 H12 N5 O6 P
IVOMOUWHDPKRLL-KQYNXXCUSA-N
 Ligand Interaction
CA
Query on CA

Download Ideal Coordinates CCD File 
AA [auth O] , BA [auth P] , CA [auth P] , DA [auth P] , EA [auth Q] , FA [auth Q] , GA [auth Q] , HA [auth R] , 
AA [auth O],  BA [auth P],  CA [auth P],  DA [auth P],  EA [auth Q],  FA [auth Q],  GA [auth Q],  HA [auth R],  IA [auth R],  JA [auth R],  KA [auth S],  LA [auth S],  MA [auth S],  NA [auth T],  OA [auth T],  PA [auth T],  Y [auth O],  Z [auth O]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download Ideal Coordinates CCD File 
M [auth A], O [auth B], Q [auth C], S [auth D], U [auth E], W [auth F]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.40 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.266 
  • R-Value Observed: 0.266 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 320.501α = 90
b = 185.044β = 90.22
c = 142.454γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-05-03
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-12-20
    Changes: Database references