Related Experiment Video

Updated: Aug 15, 2026

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis
09:57

System for Efficacy and Cytotoxicity Screening of Inhibitors Targeting Intracellular Mycobacterium tuberculosis

Published on: April 5, 2017

Interaction studies on proteins encoded by the phthiocerol dimycocerosate locus of Mycobacterium tuberculosis

A Rao1, A Ranganathan

  • 1Recombinant Gene Products Group, International Centre for Genetic Engineering and Biotechnology, Aruna Asaf Ali Marg, PO Box 10504, 110067 New Delhi, India.

Molecular Genetics and Genomics : MGG
|January 26, 2005
PubMed

Insights

Polyketide synthases (PKSs) in Mycobacterium tuberculosis create virulence factors. This study shows PpsE protein interacts with TesA, revising the model for phthiocerol dimycocerosate (PDIM) synthesis.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Polyketide synthases (PKSs) in Mycobacterium tuberculosis are crucial for synthesizing virulence factors.
  • The phenolphthiocerol synthase PKS cluster is essential for producing phthiocerol dimycocerosate (PDIM), a key virulence determinant.

Purpose of the Study:

  • To investigate the interaction between PpsE, a component of the PDIM synthesis PKS cluster, and the type II thioesterase TesA.
  • To elucidate the roles of protein interactions in the polyketide processing pathway for PDIM synthesis.

Main Methods:

  • Utilized a two-hybrid system to detect protein-protein interactions.
  • Confirmed the interaction using a glutathione S-transferase (GST) pull-down assay with purified proteins.

Main Results:

  • Provided evidence for a direct interaction between the PpsE protein and the TesA thioesterase.
  • Demonstrated the interaction using both in vivo (two-hybrid) and in vitro (GST pull-down) methods.

Conclusions:

  • The interaction between PpsE and TesA is a significant finding in understanding PDIM biosynthesis.
  • Presented a revised model for polyketide processing during PDIM synthesis, incorporating the PpsE-TesA interaction.

More Related Videos

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

Fluorescence Assays for the Study of Mycobacterium tuberculosis Interaction with the Immune Receptor SLAMF107:42

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

Published on: February 28, 2025

Related Concept Videos

Cell Specific Gene Expression01:58

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
Tuberculosis01:23

Tuberculosis

Tuberculosis (TB) remains a significant global health concern, primarily targeting the lungs and spreading through airborne transmission. Infection begins when aerosolized droplet nuclei, expelled by an individual with active TB, are inhaled by another person. These microscopic particles carry Mycobacterium tuberculosis, the causative agent of TB. Upon reaching the alveoli, the bacilli are engulfed by alveolar macrophages. However, due to their specialized lipid-rich cell wall, these pathogens...