1S26 Toxin,Lyase Metal Binding Protein date Jan 08, 2004
title Structure Of Anthrax Edema Factor-Calmodulin-Alpha,Beta- Methyleneadenosine 5'-Triphosphate Complex Reveals An Alternative Mode Of Atp Binding To The Catalytic Site
authors Y.Shen, N.L.Zhukovskaya, A.Bohm, W.-J.Tang
compound source
Molecule: Calmodulin-Sensitive Adenylate Cyclase
Chain: A, B, C
Fragment: Residue 291-800, C-Terminal Ef3
Synonym: Atp Pyrophosphate-Lyase, Adenylyl Cyclase, Edema Factor, Ef, Anthrax Edema Toxin Adenylate Cyclase Component;
Ec: 4.6.1.1
Engineered: Yes
Organism_scientific: Bacillus Anthracis
Organism_common: Bacteria
Gene: Cya, Pxo1-122
Expression_system: Escherichia Coli
Expression_system_common: Bacteria
Expression_system_strain: Bl21
Expression_system_vector_type: Plasmid
Expression_system_plasmid: Pproex

Molecule: Calmodulin
Chain: D, E, F
Engineered: Yes

Organism_scientific: Homo Sapiens
Organism_common: Human
Gene: Calm1, Cam1, Calm, Cam , Calm2, Cam2, Camb , Calm3, Cam3, Camc;
Expression_system: Escherichia Coli
Expression_system_common: Bacteria
Expression_system_strain: Bl21
Expression_system_vector_type: Plasmid
Expression_system_plasmid: Paed4-Hcam
symmetry Space Group: I 2 2 2
R_factor 0.264
crystal
cell
length a length b length c angle alpha angle beta angle gamma
117.555 167.605 345.346 90.00 90.00 90.00
method X-Ray Diffractionresolution 3.00 Å
ligand APC, CA, YB enzyme Adenylate cyclase;. Adenylylcyclase;. Adenyl cyclase;. 3',5'-cyclic AMP synthetase. Lyase E.C.4.6.1.1 BRENDA
domain The metal ion is coordinated by residues from ca; calmodulin probably binds in a multistep fashion first to residues in ca and then to residues present in the linker and the helical domain. The pa-binding region is found in both b.anthracis ef and lf. The c-terminal region contains the calmodulin-dependent activation domain and the catalytic site. This region is composed of three globular domains: ca, cb and a helical domain connected to ca by a linker. The n-terminal region contains the residues responsible for binding to pa63. The active site lies at the interface of ca and cb.
similarity Contains 4 ef-hand domains. Belongs to the adenylyl cyclase class-2 family.[Anthrax_toxA]
subunit Ef probably forms oligomers as part of the translocation machinery, formed by an heterocomplex of pa63 monomers and ef subunits, and it is functional as a monomer in the host cell. Anthrax toxins are composed of three distinct proteins, a protective antigen (pa), a lethal factor (lf) and an edema factor (ef). None of these is toxic by itself. Pa+lf forms the lethal toxin (letx); pa+ef forms the edema toxin (edtx).
catalytic activ. Atp = 3',5'-cyclic amp + diphosphate.
post-translat. modifications Ubiquitination results in a strongly decreased activity (by similarity). Phosphorylation results in a decreased activity (by similarity).
subcellular loc. Secreted protein.
enzyme regulation It has an absolute requirement for host calmodulin for its activation. Inhibited by ethyl 5- aminopyrazolo[1,5-a]quinazoline-3-carboxylate.
genes BXA0141, GBAA, cya (B. anthracis); cya (B. pertussis); GNAS (B. taurus); ADCY5 (C. familiaris); CAMC, CAMIII, CALM3 (H. sapiens); MT1302 (M. tuberculosis); Adcy2 (R. norvegicus); 4.1, 4.3, GRESAG (T. brucei); calm2 (X. laevis)
function One of the three proteins composing the anthrax toxin, the agent which infects many mammalian species and that may cause death. Among the enzymes to be stimulated by the calmodulin-ca(2+) complex are a number of protein kinases and phosphatases. Ef is a calmodulin-dependent adenylyl cyclase that, when associated with pa, causes edema. Ef is not toxic by itself and it is required for the survival of germinated spores within macrophages at the early stages of infection. Calmodulin mediates the control of a large number of enzymes by ca(2+). Provokes dramatic elevation of intracellular camp levels in the host.
Gene
Ontology
ChainFunctionProcessComponent
A, C, B
  • nucleotide binding
  • magnesium ion binding
  • adenylate cyclase activity
  • calcium ion binding
  • protein binding
  • calmodulin binding
  • ATP binding
  • lyase activity
  • metal ion binding
  • cAMP biosynthetic process
  • pathogenesis
  • extracellular region
  • F, D, E
  • calcium ion binding
  • protein binding
  • N-terminal myristoylation do...
  • G-protein coupled receptor p...
  • cytoplasm
  • plasma membrane
  • disease Calmodulin 3; Calm3
    Primary referenceStructure of anthrax edema factor-calmodulin-adenosine 5'-(alpha,beta-methylene)-triphosphate complex reveals an alternative mode of ATP binding to the catalytic site., Shen Y, Guo Q, Zhukovskaya NL, Drum CL, Bohm A, Tang WJ, Biochem Biophys Res Commun 2004 Apr 30;317(2):309-14. PMID:15063758
    Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (347 Kb) [Save to disk]
  • Biological Unit Coordinates (1s26.pdb1.gz) 106 Kb
  • Biological Unit Coordinates (1s26.pdb2.gz) 103 Kb
  • Biological Unit Coordinates (1s26.pdb3.gz) 109 Kb
  • CSU: Contacts of Structural Units for 1S26
  • Likely Quarternary Molecular Structure file(s) for 1S26
  • Structure Factors (627 Kb)
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  • Classification of representative domains in scop (Structural Classification of Proteins)
        - Domain d1s26a_, region A [Jmol] [rasmolscript] [script source]
        - Domain d1s26b_, region B [Jmol] [rasmolscript] [script source]
        - Domain d1s26c_, region C [Jmol] [rasmolscript] [script source]
        - Domain d1s26d_, region D [Jmol] [rasmolscript] [script source]
        - Domain d1s26e_, region E [Jmol] [rasmolscript] [script source]
        - Domain d1s26f_, region F [Jmol] [rasmolscript] [script source]
  • Fold representative 1s26 from FSSP and Dali (Families of Structurally Similar Proteins)
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  • View one-letter amino acid or nucleotide sequence for each chain: [1s26_F] [1s26_A] [1s26_C] [1s26_D] [1s26_E] [1s26_B]
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