The Mycobacterium tuberculosis PE_PGRS Protein Family Acts as an Immunological Decoy to Subvert Host Immune Response

Related Experiment Video

Updated: Oct 7, 2025

Fluorescence Assays for the Study of Mycobacterium tuberculosis Interaction with the Immune Receptor SLAMF1
07:42

Fluorescence Assays for the Study of Mycobacterium tuberculosis Interaction with the Immune Receptor SLAMF1

Published on: February 28, 2025

622

Tarina Sharma1, Anwar Alam1, Aquib Ehtram2

  • 1ICMR-National Institute of Pathology, Ansari Nagar West, New Delhi 110029, India.

International Journal of Molecular Sciences
|January 11, 2022
PubMed

Insights

Mycobacterium tuberculosis (M.tb) uses PE/PPE/PE_PGRS proteins to evade immune responses and establish infection. Understanding these virulence factors is key to developing new tuberculosis treatments.

Area of Science:

  • Immunology
  • Microbiology
  • Pathogenesis

Background:

  • Mycobacterium tuberculosis (M.tb) is a successful pathogen residing in host macrophages, employing strategies to resist immune responses.
  • M.tb evades host immunity by subverting immune effector functions, contributing to latent infection and disease persistence.

Purpose of the Study:

  • To investigate the role of M.tb's PE/PPE/PE_PGRS proteins in virulence and immune evasion.
  • To understand how these proteins modulate host immune responses and affect pathogen clearance.

Main Methods:

  • Analysis of M.tb genome for PE/PPE/PE_PGRS protein characteristics.
  • Evaluation of protein functions in modulating host immune responses and virulence.

Main Results:

  • PE/PPE/PE_PGRS proteins are intrinsically disordered, redundant, and antigenic, enhancing M.tb virulence.
  • These proteins act as decoy molecules, masking effector molecules and modulating immuno-surveillance.

Conclusions:

  • Understanding PE/PPE/PE_PGRS protein mechanisms is crucial for advancing knowledge of M.tb pathogenesis.
  • Targeting these proteins could lead to novel strategies for combating tuberculosis infections.
Keywords:
TBdecoy antigensglycineimmune evasionlatencypathogenicityvirulence

More Related Videos

Preparation of Mycobacterium Tuberculosis Culture Filtrate to Understand TB Pathogenesis07:32

Preparation of Mycobacterium Tuberculosis Culture Filtrate to Understand TB Pathogenesis

Published on: March 28, 2025

645
Separation and Fractionation of Cell Wall and Cell Membrane Proteins from Mycobacterium tuberculosis for Downstream Protein Analysis06:14

Separation and Fractionation of Cell Wall and Cell Membrane Proteins from Mycobacterium tuberculosis for Downstream Protein Analysis

Published on: September 26, 2025

27

Related Concept Videos

Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
1.6K
Pulmonary Tuberculosis II01:28

Pulmonary Tuberculosis II

Tuberculosis, or TB, is a bacterial infectious disease caused by Mycobacterium tuberculosis. While its primary impact is on the lungs, leading to pulmonary tuberculosis, it can also affect various other organs, a condition referred to as extrapulmonary tuberculosis.
Here is a detailed explanation of its pathophysiology:
Transmission: The process begins when a person inhales droplet nuclei containing M. tuberculosis. These are typically released into the air when an individual with pulmonary or...
605
Stringent Response in E. coli01:23

Stringent Response in E. coli

Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
71
Antimicrobial Proteins01:23

Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...
8.3K
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
6.1K
Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
Several diagnostic approaches are used to detect TB. The conventional method is the Tuberculin Skin Test (TST), also known as the Mantoux test. However, this method has...
224