3FZY

Crystal Structure of Pre-cleavage Form of Cysteine Protease Domain from Vibrio cholerae RtxA Toxin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.216 
  • R-Value Work: 0.169 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and molecular mechanism for autoprocessing of MARTX toxin of Vibrio cholerae at multiple sites

Prochazkova, K.Shuvalova, L.A.Minasov, G.Voburka, Z.Anderson, W.F.Satchell, K.J.

(2009) J.Biol.Chem. 284: 26557-26568

  • DOI: 10.1074/jbc.M109.025510

  • PubMed Abstract: 
  • The multifunctional autoprocessing repeats-in-toxin (MARTX) toxin of Vibrio cholerae causes destruction of the actin cytoskeleton by covalent cross-linking of actin and inactivation of Rho GTPases. The effector domains responsible for these activitie ...

    The multifunctional autoprocessing repeats-in-toxin (MARTX) toxin of Vibrio cholerae causes destruction of the actin cytoskeleton by covalent cross-linking of actin and inactivation of Rho GTPases. The effector domains responsible for these activities are here shown to be independent proteins released from the large toxin by autoproteolysis catalyzed by an embedded cysteine protease domain (CPD). The CPD is activated upon binding inositol hexakisphosphate (InsP(6)). In this study, we demonstrated that InsP(6) is not simply an allosteric cofactor, but rather binding of InsP(6) stabilized the CPD structure, facilitating formation of the enzyme-substrate complex. The 1.95-A crystal structure of this InsP(6)-bound unprocessed form of CPD was determined and revealed the scissile bond Leu(3428)-Ala(3429) captured in the catalytic site. Upon processing at this site, CPD was converted to a form with 500-fold reduced affinity for InsP(6), but was reactivated for high affinity binding of InsP(6) by cooperative binding of both a new substrate and InsP(6). Reactivation of CPD allowed cleavage of the MARTX toxin at other sites, specifically at leucine residues between the effector domains. Processed CPD also cleaved other proteins in trans, including the leucine-rich protein YopM, demonstrating that it is a promiscuous leucine-specific protease.


    Organizational Affiliation

    Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RTX toxin RtxA
A, B
234Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961)Mutation(s): 1 
Gene Names: rtxA (rtx)
EC: 3.4.22.-
Find proteins for Q9KS12 (Vibrio cholerae serotype O1 (strain ATCC 39315 / El Tor Inaba N16961))
Go to UniProtKB:  Q9KS12
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
UNX
Query on UNX

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A
UNKNOWN ATOM OR ION
X
*
 Ligand Interaction
IHP
Query on IHP

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Download CCD File 
A, B
INOSITOL HEXAKISPHOSPHATE
C6 H18 O24 P6
IMQLKJBTEOYOSI-GPIVLXJGSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
IHPKd: 180 nM PDBBIND
Experimental Data & Validation

Experimental Data

Unit Cell:
Length (Å)Angle (°)
a = 46.055α = 90.00
b = 66.373β = 90.00
c = 137.958γ = 90.00
Software Package:
Software NamePurpose
Blu-Icedata collection
HKL-2000data reduction
PHASERphasing
HKL-2000data scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-02-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Refinement description, Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description