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Updated: Jun 23, 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

The functions and inhibitors of protein tyrosine phosphatase B from Mycobacterium tuberculosis

Haonan Wang1,2, Leiliang Zhang1,2

  • 1Department of Clinical Laboratory Medicine, The First Affiliated Hospital of Shandong First Medical University and Shandong Provincial Qianfoshan Hospital, Jinan, Shandong, China.

Frontiers in Immunology
|June 22, 2026
PubMed

Insights

Mycobacterium tuberculosis protein tyrosine phosphatase B (PtpB) disrupts host immunity by dephosphorylating signaling pathways and blocking pyroptosis. Targeting PtpB offers a promising strategy for novel tuberculosis therapies against drug-resistant strains.

Area of Science:

  • Microbiology
  • Immunology
  • Biochemistry

Background:

  • Mycobacterium tuberculosis (Mtb) secretes protein tyrosine phosphatase B (PtpB), a virulence factor.
  • PtpB interferes with host innate immune responses, contributing to Mtb pathogenesis.

Purpose of the Study:

  • To review current knowledge on PtpB structure, function, and inhibition.
  • To highlight PtpB as a potential target for host-directed tuberculosis therapies.

Main Methods:

  • Literature review synthesizing existing research on PtpB.
  • Analysis of PtpB's structural features and enzymatic activity.
  • Evaluation of PtpB inhibitors and their translational potential.

Main Results:

  • PtpB possesses a unique ubiquitin-activated dynamic lid regulating substrate specificity.
  • PtpB suppresses inflammation by dephosphorylating MAPK and JAK-STAT pathways.
  • PtpB inhibits pyroptosis by dephosphorylating PI4P and PI(4,5)P2, preventing Gasdermin D localization.

Conclusions:

  • PtpB is a critical Mtb effector targeting host immune pathways.
  • Inhibitors targeting PtpB show translational potential for novel anti-tuberculosis therapies.
  • Targeting PtpB represents a viable host-directed strategy against drug-resistant tuberculosis.
Keywords:
JAK-STATMycobacterium tuberculosisPI(4,5)P2PtpBgasdermin D

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