6UZB

Anthrax toxin protective antigen channels bound to edema factor


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report



Literature

Atomic structures of anthrax toxin protective antigen channels bound to partially unfolded lethal and edema factors.

Hardenbrook, N.J.Liu, S.Zhou, K.Ghosal, K.Hong Zhou, Z.Krantz, B.A.

(2020) Nat Commun 11: 840-840

  • DOI: 10.1038/s41467-020-14658-6
  • Primary Citation of Related Structures:  
    6UZD, 6UZE, 6UZB, 6PSN

  • PubMed Abstract: 
  • Following assembly, the anthrax protective antigen (PA) forms an oligomeric translocon that unfolds and translocates either its lethal factor (LF) or edema factor (EF) into the host cell. Here, we report the cryo-EM structures of heptameric PA channels w ...

    Following assembly, the anthrax protective antigen (PA) forms an oligomeric translocon that unfolds and translocates either its lethal factor (LF) or edema factor (EF) into the host cell. Here, we report the cryo-EM structures of heptameric PA channels with partially unfolded LF and EF at 4.6 and 3.1-Å resolution, respectively. The first α helix and β strand of LF and EF unfold and dock into a deep amphipathic cleft, called the α clamp, which resides at the interface of two PA monomers. The α-clamp-helix interactions exhibit structural plasticity when comparing the structures of lethal and edema toxins. EF undergoes a largescale conformational rearrangement when forming the complex with the channel. A critical loop in the PA binding interface is displaced for about 4 Å, leading to the weakening of the binding interface prior to translocation. These structures provide key insights into the molecular mechanisms of translocation-coupled protein unfolding and translocation.


    Organizational Affiliation

    Department of Microbial Pathogenesis, University of Maryland, Baltimore, Baltimore, MD, 21201, USA. bkrantz@umaryland.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Protective antigen ABCDEFG735Bacillus anthracisMutation(s): 0 
Gene Names: pagApagpXO1-110BXA0164GBAA_pXO1_0164
Find proteins for P13423 (Bacillus anthracis)
Explore P13423 
Go to UniProtKB:  P13423
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Calmodulin-sensitive adenylate cyclase H767Bacillus 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
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesDMR-1548924
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesR01GM071940/AI094386/DE025567
National Institutes of Health/National Center for Research Resources (NIH/NCRR)United StatesR21AI124020

Revision History 

  • Version 1.0: 2020-03-04
    Type: Initial release