Cited by 47Tuberculosis Research and EpidemiologyUbiquitin and proteasome pathwaysImmune Response and Inflammation

Mycobacterium tuberculosis protein kinase G acts as an unusual ubiquitinating enzyme to impair host immunity

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Wang, Jing, Ge, Pupu, Lei, Zehui, Lu, Zhe, Qiang, Lihua, Chai, Qiyao, Zhang, Yong, Zhao, Dongdong +9 more·2021·The EMBO Reports

Abstract

Upon Mycobacterium tuberculosis (Mtb) infection, protein kinase G (PknG), a eukaryotic-type serine-threonine protein kinase (STPK), is secreted into host macrophages to promote intracellular survival of the pathogen. However, the mechanisms underlying this PknG-host interaction remain unclear. Here, we demonstrate that PknG serves both as a ubiquitin-activating enzyme (E1) and a ubiquitin ligase (E3) to trigger the ubiquitination and degradation of tumor necrosis factor receptor-associated factor 2 (TRAF2) and TGF-β-activated kinase 1 (TAK1), thereby inhibiting the activation of NF-κB signaling and host innate responses. PknG promotes the attachment of ubiquitin (Ub) to the ubiquitin-conjugating enzyme (E2) UbcH7 via an isopeptide bond (UbcH7 K82-Ub), rather than the usual C86-Ub thiol-ester bond. PknG induces the discharge of Ub from UbcH7 by acting as an isopeptidase, before attaching Ub to its substrates. These results demonstrate that PknG acts as an unusual ubiquitinating enzyme to remove key components of the innate immunity system, thus providing a potential target for tuberculosis treatment.

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  • PknG, in conjunction with the SapM phosphatase, blocks host phagosome maturation and modulates the host immune response, establishing PknG and SapM as bona fide virulence factors.

    “This was subsequently validated in M. tuberculosis where PknG, in conjunction with the SapM phosphatase (86), blocks host phagosome maturation and modulates the host immune response (88, 96–98), establishing PknG and SapM as bona fide virulence factors.”

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Authors
Wang, J., Ge, P., Lei, Z., Lu, Z., Qiang, L., Chai, Q., Zhang, Y., Zhao, D., Li, B., Su, J., Peng, R., Pang, Y., Shi, Y., Zhang, Y., Gao, G. F., Qiu, X.-B., & Liu, C. H.
Affiliations
  • Chinese Academy of Sciences (CN)
  • Capital Medical University (CN)
  • Beijing Normal University (CN)
Corresponding author
  • Gao, George Fu
  • Qiu, Xiao-Bo
  • Liu, Cui Hua
Venue
The EMBO Reports
Published
2021-05-02
Volume
22
Issue
6
Pages
e52175-e52175
ISSN
  • 1469-221X (ISSN-L)
  • 1469-3178
OpenAlex
W3158594254
Cited by
47
References
47
Citations by year
2026: 5 · 2025: 15 · 2024: 5 · 2023: 9 · 2022: 8 · 2021: 5
FWCI
2.14
Type
journal article
Language
en
Open access
Locations
  • EMBO Reports (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Natural Science Foundation of China (31830003, 81825014, 82022041, 81871616)
  • Strategic Priority Research Program of the Chinese Academy of Sciences (XDB29020000)
  • National Key Research and Development Program of China (2019YFA0802100, 2017YFA0505900, 2017YFD0500300)
  • National Science and Technology Major Project (2018ZX10101004)
  • Youth Innovation Promotion Association CAS (Y82R011CX3)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
Mycobacterium tuberculosis, PknG, protein kinase G, ubiquitin ligase, ubiquitin-activating enzyme, isopeptide bonds, UbcH7, TRAF2, TAK1, NF-κB signaling, innate immunity, host-pathogen interaction, polyubiquitination, protein degradation, tuberculosis
MeSH terms
Mycobacterium tuberculosis, Protein Serine-Threonine Kinases, Cyclic GMP-Dependent Protein Kinases, Ubiquitin, Ubiquitin-Conjugating Enzymes, Ubiquitin-Protein Ligases, Ubiquitination

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