Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Structure of the glucosyltransferase domain of TcdA in complex with RhoA provides insights into substrate recognition

Journal Article · · Scientific Reports
 [1];  [1];  [2];  [1]
  1. Univ. of California, Irvine, CA (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Clostridioides difficile is one of the most common causes of antibiotic-associated diarrhea in developed countries. As key virulence factors of C. difficile, toxin A (TcdA) and toxin B (TcdB) act by glucosylating and inactivating Rho and Ras family small GTPases in host cells, which leads to actin cytoskeleton disruption, cell rounding, and ultimately cell death. Here we present the co-crystal structure of the glucosyltransferase domain (GTD) of TcdA in complex with its substrate human RhoA at 2.60-angstrom resolution. This structure reveals that TcdA GTD grips RhoA mainly through its switch I and switch II regions, which is complemented by interactions involving RhoA’s pre-switch I region. Comprehensive structural comparisons between the TcdA GTD–RhoA complex and the structures of TcdB GTD in complex with Cdc42 and R-Ras reveal both the conserved and divergent features of these two toxins in terms of substrate recognition. Taken together, these findings establish the structural basis for TcdA recognition of small GTPases and advance our understanding of the substrates selectivity of large clostridial toxins.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Institute of Allergy and Infectious Diseases (NIAID); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1877206
Alternate ID(s):
OSTI ID: 1878391
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 12; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

References (47)

Quantification of small GTPase glucosylation by clostridial glucosylating toxins using multiplexed MRM analysis journal May 2017
Inference of Macromolecular Assemblies from Crystalline State journal September 2007
Conformational Changes and Reaction of Clostridial Glycosylating Toxins journal April 2008
Clostridium difficile toxin glucosyltransferase domains in complex with a non-hydrolyzable UDP-glucose analogue journal June 2017
Hijacking of Rho GTPases during bacterial infection journal September 2013
Substrate Specificity of Clostridial Glucosylating Toxins and Their Function on Colonocytes Analyzed by Proteomics Techniques journal March 2013
Free R value: a novel statistical quantity for assessing the accuracy of crystal structures journal January 1992
Glucosylation of Rho proteins by Clostridium difficile toxin B journal June 1995
Botulinum neurotoxin B recognizes its protein receptor with high affinity and specificity journal December 2006
Autocatalytic cleavage of Clostridium difficile toxin B journal March 2007
The role of toxin A and toxin B in Clostridium difficile infection journal September 2010
Frizzled proteins are colonic epithelial receptors for C. difficile toxin B journal September 2016
Bacterial protein toxins that modify host regulatory GTPases journal June 2011
Crystal structure of RhoA–GDP and its functional implications journal September 1997
N-linked glycosylation of SV2 is required for binding and uptake of botulinum neurotoxin A journal June 2016
Structural basis for CSPG4 as a receptor for TcdB and a therapeutic target in Clostridioides difficile infection journal June 2021
Sulfated glycosaminoglycans and low-density lipoprotein receptor contribute to Clostridium difficile toxin A entry into cells journal June 2019
Clostridioides difficile toxins: mechanisms of action and antitoxin therapeutics journal November 2021
Subtyping analysis reveals new variants and accelerated evolution of Clostridioides difficile toxin B journal July 2020
Clostridium difficile Infection journal April 2015
Translocation domain mutations affecting cellular toxicity identify the Clostridium difficile toxin B pore journal February 2014
The Enterotoxin from Clostridium difficile (ToxA) Monoglucosylates the Rho Proteins journal June 1995
Crystal Structure of Human RhoA in a Dominantly Active Form Complexed with a GTP Analogue journal April 1998
Low pH-induced Formation of Ion Channels by Clostridium difficile Toxin B in Target Cells journal January 2001
Structural Determinants of Clostridium difficile Toxin A Glucosyltransferase Activity journal January 2012
R-Ras Glucosylation and Transient RhoA Activation Determine the Cytopathic Effect Produced by Toxin B Variants from Toxin A-negative Strains of Clostridium difficile journal March 2003
Auto-catalytic Cleavage of Clostridium difficile Toxins A and B Depends on Cysteine Protease Activity journal June 2007
Phaser crystallographic software journal July 2007
Coot model-building tools for molecular graphics journal November 2004
MolProbity : all-atom structure validation for macromolecular crystallography journal December 2009
XDS journal January 2010
PHENIX: a comprehensive Python-based system for macromolecular structure solution journal January 2010
REFMAC 5 for the refinement of macromolecular crystal structures journal March 2011
Haemorrhagic toxin and lethal toxin from C lostridium sordellii strain vpi9048: molecular characterization and comparative analysis of substrate specificity of the large clostridial glucosylating toxins: Large clostridial glucosylating toxins substrate specifcity journal August 2014
Structural determinants for membrane insertion, pore formation and translocation of Clostridium difficile toxin B: Pore formation of C. difficile toxin B journal January 2011
Structural basis for selective modification of Rho and Ras GTPases by Clostridioides difficile toxin B journal October 2021
Structural basis for recognition of frizzled proteins by Clostridium difficile toxin B journal May 2018
pH-Induced Conformational Changes in Clostridium difficile Toxin B journal May 2000
Large Clostridial Toxins: Mechanisms and Roles in Disease journal August 2021
Clostridium difficile Toxin Biology journal September 2017
RHO GTPASES: Biochemistry and Biology journal November 2005
Clostridial Glucosylating Toxins Enter Cells via Clathrin-Mediated Endocytosis journal May 2010
Phylogenomics of 8,839 Clostridioides difficile genomes reveals recombination-driven evolution and diversification of toxin A and B journal December 2020
Difference in Mono-O-Glucosylation of Ras Subtype GTPases Between Toxin A and Toxin B From Clostridioides difficile Strain 10463 and Lethal Toxin From Clostridium sordellii Strain 6018 journal December 2018
Ribotype Classification of Clostridioides difficile Isolates Is Not Predictive of the Amino Acid Sequence Diversity of the Toxin Virulence Factors TcdA and TcdB journal June 2020
The Enterotoxicity of Clostridium difficile Toxins journal July 2010
The Role of Rho GTPases in Toxicity of Clostridium difficile Toxins journal December 2015

Similar Records

Structural basis for selective modification of Rho and Ras GTPases by Clostridioides difficile toxin B
Journal Article · Thu Oct 21 20:00:00 EDT 2021 · Science Advances · OSTI ID:1831265

Structural Determinants of Clostridium difficile Toxin A Glucosyltransferase Activity
Journal Article · Wed Mar 28 00:00:00 EDT 2012 · Journal of Biological Chemistry · OSTI ID:1037483