6YNU

CaM-P458 complex (crystal form 1)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.12 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.249 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A High-Affinity Calmodulin-Binding Site in the CyaA Toxin Translocation Domain is Essential for Invasion of Eukaryotic Cells.

Voegele, A.Sadi, M.O'Brien, D.P.Gehan, P.Raoux-Barbot, D.Davi, M.Hoos, S.Brule, S.Raynal, B.Weber, P.Mechaly, A.Haouz, A.Rodriguez, N.Vachette, P.Durand, D.Brier, S.Ladant, D.Chenal, A.

(2021) Adv Sci (Weinh) 8: 2003630-2003630

  • DOI: 10.1002/advs.202003630
  • Primary Citation of Related Structures:  
    6YNS, 6YNU

  • PubMed Abstract: 
  • The molecular mechanisms and forces involved in the translocation of bacterial toxins into host cells are still a matter of intense research. The adenylate cyclase (CyaA) toxin from Bordetella pertussis displays a unique intoxication pathway in which its catalytic domain is directly translocated across target cell membranes ...

    The molecular mechanisms and forces involved in the translocation of bacterial toxins into host cells are still a matter of intense research. The adenylate cyclase (CyaA) toxin from Bordetella pertussis displays a unique intoxication pathway in which its catalytic domain is directly translocated across target cell membranes. The CyaA translocation region contains a segment, P454 (residues 454-484), which exhibits membrane-active properties related to antimicrobial peptides. Herein, the results show that this peptide is able to translocate across membranes and to interact with calmodulin (CaM). Structural and biophysical analyses reveal the key residues of P454 involved in membrane destabilization and calmodulin binding. Mutational analysis demonstrates that these residues play a crucial role in CyaA translocation into target cells. In addition, calmidazolium, a calmodulin inhibitor, efficiently blocks CyaA internalization. It is proposed that after CyaA binding to target cells, the P454 segment destabilizes the plasma membrane, translocates across the lipid bilayer and binds calmodulin. Trapping of CyaA by the CaM:P454 interaction in the cytosol may assist the entry of the N-terminal catalytic domain by converting the stochastic motion of the polypeptide chain through the membrane into an efficient vectorial chain translocation into host cells.


    Organizational Affiliation

    Biochemistry of Macromolecular Interactions Unit Department of Structural Biology and Chemistry Institut Pasteur CNRS UMR3528 Paris 75015 France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin-1A, C148Homo 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
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DP23
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Bifunctional adenylate cyclase toxin/hemolysin CyaAB, D24Bordetella pertussisMutation(s): 0 
EC: 4.6.1.1
UniProt
Find proteins for P0DKX7 (Bordetella pertussis (strain Tohama I / ATCC BAA-589 / NCTC 13251))
Explore P0DKX7 
Go to UniProtKB:  P0DKX7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DKX7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.12 Å
  • R-Value Free: 0.291 
  • R-Value Work: 0.246 
  • R-Value Observed: 0.249 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 73.341α = 90
b = 174.344β = 90
c = 97.843γ = 90
Software Package:
Software NamePurpose
autoPROCdata reduction
Aimlessdata scaling
PHASERphasing
BUSTERrefinement
PHENIXrefinement

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Centre National de la Recherche Scientifique (CNRS)France--

Revision History  (Full details and data files)

  • Version 1.0: 2021-03-17
    Type: Initial release
  • Version 1.1: 2021-03-24
    Changes: Database references
  • Version 1.2: 2021-05-26
    Changes: Database references