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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
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Related Experiment Video

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Author Spotlight: Characterizing DNA Replication of Pathogenic Repeats to Uncover Mechanisms of Replication Fork Stalling and Expansion
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CBX4 facilitates EV71 replication by SUMOylation and stabilizing 3D polymerase.

Rui Su1, Yifan Niu1, Aiping Sun1,2

  • 1Department of Immunology, School of Basic Medical Sciences, Henan Medical University, Xinxiang, China.

Frontiers in Microbiology
|March 20, 2026
PubMed
Summary

SUMO E3 ligase CBX4 promotes Enterovirus 71 (EV71) replication by stabilizing the 3D polymerase. Inhibiting this process offers a potential antiviral strategy against EV71 and related enteroviruses.

Keywords:
3D polymeraseCBX4Enterovirus 71SUMOylationprotein stabilization

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Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Enterovirus 71 (EV71) causes hand-foot-mouth disease (HFMD) and severe neurological complications.
  • Understanding EV71 infection mechanisms is crucial for developing antiviral therapies.

Purpose of the Study:

  • To investigate the role of SUMO E3 ligase CBX4 in EV71 replication.
  • To elucidate the interaction between CBX4 and EV71 3D polymerase.

Main Methods:

  • Investigated the effect of CBX4 overexpression and knockdown on EV71 replication and 3D polymerase stability.
  • Analyzed SUMOylation and ubiquitination modifications of 3D polymerase.
  • Tested the antiviral effect of a SUMOylation inhibitor (2-D08) on EV71, coxsackievirus B3 (CVB3), and poliovirus 1 (PV1).

Main Results:

  • CBX4 was found to be essential for EV71 replication.
  • CBX4 interacts with and stabilizes the EV71 3D polymerase.
  • CBX4 mediates SUMOylation and ubiquitination of 3D polymerase.
  • The SUMOylation inhibitor 2-D08 significantly reduced EV71 replication.

Conclusions:

  • CBX4 facilitates EV71 infection by promoting SUMOylation and stabilization of the 3D polymerase.
  • CBX4 represents a potential novel target for antiviral drug development against EV71 and other enteroviruses.