Systematic Review Explores Ubiquitination in Bacterial Infection and Immune Response

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Frontiers in Medicine Published May 12, 2026 Medically reviewed May 12, 2026 Study authors: Jinru Liu, Xiaomei Li, Luna He, Xin Wang, Hongyuan Yang, Xianggui Yang, Jun Zeng DOI ↗ By Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease

Key Takeaway

Recognize ubiquitination as a key regulator of inflammation and bacterial clearance, but evidence is qualitative and preliminary.

This systematic review examines the role of the ubiquitination system in bacterial infections, focusing on its dual functions in inflammatory signaling and intracellular pathogen clearance. The authors synthesize evidence showing that ubiquitination initiates inflammatory responses through TRAF6 activation, while deubiquitinating enzymes such as A20 provide negative feedback to regulate inflammation. Additionally, ubiquitin ligases like Parkin and RNF213 are involved in marking and eliminating intracellular bacteria, including Mycobacterium tuberculosis and Salmonella.

The review is qualitative in nature, as no pooled effect sizes or quantitative meta-analyses are reported. The evidence is drawn from a range of studies, but specific details on study populations, sample sizes, interventions, or comparators are not provided. The authors do not report any limitations or certainty assessments, which limits the ability to gauge the strength of the conclusions.

Given the lack of quantitative synthesis and the absence of reported limitations, the findings should be interpreted as a descriptive overview rather than definitive evidence. The review highlights potential therapeutic targets within the ubiquitination pathway for bacterial infections, but clinical applicability remains uncertain without further interventional studies. Clinicians should consider this as foundational knowledge rather than actionable guidance.

Study Details

Study typeSystematic review

EvidenceLevel 1

PublishedMay 2026

View Original Abstract ↓

Resistant bacterial infections have become a major global public health challenge, claiming millions of lives annually and imposing enormous economic burdens. The core issue lies in the imbalance of the host immune system, particularly macrophage function. This review elucidates the pivotal role of the host ubiquitin system in macrophage antimicrobial immunity. It systematically examines how this system leverages its unique enzyme-substrate network to orchestrate immune responses with dynamic equilibrium and precision, achieved through two critical pathways: the appropriate modulation of inflammatory signaling and the targeted clearance of intracellular pathogens. Within the Toll-like receptor (TLR)/Nuclear factor kappa-B (NF-κB) pathway, the ubiquitination system initiates inflammatory responses by activating molecules such as TRAF6, while undergoing negative feedback regulation via deubiquitinating enzymes like A20 to prevent excessive inflammatory damage. Within the autophagy pathway, ubiquitination functions as a “targeting system,” where ubiquitin ligases like Parkin and RNF213 mark and eliminate intracellular bacteria such as (Mtb) and Salmonella. In-depth analysis of the ubiquitin system’s specific roles in infection immunity and distinct bacterial infections holds significant importance for elucidating the molecular mechanisms underlying host-pathogen interactions. It will also provide key targets and novel perspectives for developing novel therapeutic strategies against drug-resistant bacterial infections.