Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

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Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 2 assigned by authors and generated by PISA (software)

Biological Assembly 3  

 3D View: Structure | Electron Density | Ligand Interaction

Standalone Viewers  
Protein Workshop | Ligand Explorer

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - AB 

Biological assembly 3 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 228969.64 
• Atom Count: 15302 
• Residue Count: 1977 
• Unique protein chains: 2

1LVC

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

• DOI: 10.2210/pdb1LVC/pdb

• Classification: LYASE
• Organism(s): Homo sapiens, Bacillus anthracis
• Expression System: Escherichia coli BL21


• Deposited: 2002-05-28 Released: 2002-12-04 
• Deposition Author(s): Shen, Y., Lee, Y.-S., Soelaiman, S., Bergson, P., Lu, D., Chen, A., Beckingham, K., Grabarek, Z., Mrksich, M., Tang, W.-J.

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Experimental Data Snapshot

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

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

• PubMed: 12485993 
• 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 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.

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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




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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
Molecule	Chains	Sequence Length	Organism	Details
calmodulin-sensitive adenylate cyclase	A, B, C	510	Bacillus anthracis	Mutation(s): 0  Gene Names: cya EC: 4.6.1.1
Find proteins for P40136 (Bacillus anthracis) Go to UniProtKB:  P40136

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
calmodulin	D, E, F	149	Homo sapiens	Mutation(s): 0  Gene Names: CALM2 (CAM2, CAMB)
Find proteins for P0DP24 (Homo sapiens) Go to Gene View: CALM2 Go to UniProtKB:  P0DP24

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
DOT	A, C	3'ANTHRANILOYL-2'-DEOXY-ADENOSINE-5'-TRIPHOSPHATE C17 H21 N6 O13 P3 FIWKNPONGIOEHC-YNEHKIRRSA-N
YB	A, B, C	YTTERBIUM (III) ION Yb AWSFICBXMUKWSK-UHFFFAOYSA-N
CA	D, E, F	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
DOT	Kd: 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 = 116.924	α = 90.00
b = 167.918	β = 90.00
c = 341.743	γ = 90.00

Software Package:

Software Name	Purpose
CNS	refinement
CNS	phasing
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-05-28 
• Released Date: 2002-12-04 
• Deposition Author(s): Shen, Y., Lee, Y.-S., Soelaiman, S., Bergson, P., Lu, D., Chen, A., Beckingham, K., Grabarek, Z., Mrksich, M., Tang, W.-J.

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