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Updated: Dec 21, 2025
Production, Crystallization and Structure Determination of C. difficile PPEP-1 via Microseeding and Zinc-SAD
Published on: December 30, 2016
The Bioinformatic and In Vitro Studies of Clostridioides Difficile Aminopeptidase M24 Revealed the Immunoreactive
Katarzyna Pacyga1, Agnieszka Razim1,2, Gayane Martirosian3
1Department of Microbiology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, 53-114 Wroclaw, Poland.
Abstract:
Clostridioides difficile (CD) is a Gram-positive pathogen responsible for CD-associated disease (CDAD), which is characterized by symptoms ranging from mild diarrhea to pseudomembranous colitis. This work is an attempt to respond to the need of novel methods for CD infection (CDI) prevention, since the number of CDI cases is still rising. A bioinformatics approach was applied to design twenty-one peptides consisting of in silico predicted linear B-cell and T-cell epitopes of aminopeptidase M24 from CD. These peptides were mapped for epitopes exploiting PEPSCAN procedure and using sera obtained from CD infected patients, umbilical cord blood, and healthy volunteers. Two new CD epitopes, 131KKGIK135 and 184KGTSTHVIT192, were identified and characterized. Immunoreactivity of the synthetic biotinylated 131KKGIK135 epitope was significantly higher compared to 184KGTSTHVIT192 epitope in Enzyme-Linked Immunosorbent Assay (ELISA) with umbilical cord blood and CDI patients' sera. Hereafter, the conjugate of bovine serum albumin and epitope 131KKGIK135 was evaluated in vitro on lung epithelial cell line. In vitro, a significant induction of IL-6 by conjugate was observed, thereby we postulate that this new 131KKGIK135 epitope possesses immunostimulating properties suggesting possibility of its use in a vaccine against Clostridioides difficile.
Insights
Researchers identified two novel Clostridioides difficile (CD) epitopes, KKGIK and KGTSTHVIT, using a bioinformatics approach. The KKGIK epitope showed higher immunoreactivity and immunostimulating properties, suggesting its potential use in developing a Clostridioides difficile infection vaccine.
Area of Science:
- Microbiology
- Immunology
- Bioinformatics
Background:
- Clostridioides difficile (CD) infection (CDI) is a growing public health concern, necessitating novel prevention strategies.
- Current treatments for CD-associated disease (CDAD) are insufficient, driving the search for alternative methods.
- Aminopeptidase M24 from CD was targeted for epitope discovery.
Purpose of the Study:
- To identify and characterize novel B-cell and T-cell epitopes of Clostridioides difficile for potential vaccine development.
- To evaluate the immunogenicity and immunostimulating properties of identified epitopes.
- To explore new avenues for preventing Clostridioides difficile infections.
Main Methods:
- A bioinformatics approach was used to design 21 peptides based on predicted epitopes of aminopeptidase M24.
- Peptides were mapped using the PEPSCAN procedure with sera from CDI patients, umbilical cord blood, and healthy volunteers.
- Enzyme-Linked Immunosorbent Assay (ELISA) and in vitro cell line assays were employed to assess epitope immunoreactivity and immunostimulating properties.
Main Results:
- Two novel Clostridioides difficile epitopes, 131KKGIK135 and 184KGTSTHVIT192, were identified.
- The synthetic biotinylated 131KKGIK135 epitope demonstrated significantly higher immunoreactivity than 184KGTSTHVIT192 in ELISA.
- In vitro assays showed that the 131KKGIK135 epitope conjugate induced significant IL-6 production, indicating immunostimulating properties.
Conclusions:
- The 131KKGIK135 epitope possesses significant immunostimulating properties.
- This novel epitope holds promise for the development of a vaccine against Clostridioides difficile.
- Further research is warranted to explore the full potential of this epitope in CDI prevention.
