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During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R...
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Adaptor Protein 1A Facilitates Dengue Virus Replication.

Umpa Yasamut1, Nopprarat Tongmuang2, Pa-thai Yenchitsomanus2

  • 1Division of Molecular Medicine, Department of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand; Graduate Program in Immunology, Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand.

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Adaptor protein complex (AP)-1A is crucial for dengue virus (DENV) replication by aiding viral RNA synthesis and membrane rearrangement. Inhibiting AP-1A reduces DENV production, offering potential therapeutic targets.

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Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • Dengue virus (DENV) replication relies on host cellular machinery for membrane rearrangement.
  • Adaptor protein complex (AP)-1 is a host factor involved in membrane trafficking and organization.

Purpose of the Study:

  • To investigate the role of AP-1A in the dengue virus life cycle.
  • To determine if AP-1A influences DENV replication and virion production.

Main Methods:

  • Utilized AP-1-dependent traffic inhibitors to assess DENV replication.
  • Employed RNA interference (siRNA) to specifically target AP-1A in Huh7 cells.
  • Quantified DENV RNA levels and virion production post-transfection.

Main Results:

  • AP-1A inhibition did not affect DENV entry but significantly reduced viral RNA replication.
  • Knockdown of AP-1A led to decreased DENV protein expression and virion production.
  • AP-1A-depleted cells exhibited altered membrane structures and fewer vesicular packets.

Conclusions:

  • AP-1A plays a significant role in facilitating DENV RNA replication.
  • AP-1A is involved in regulating DENV-induced membrane rearrangements essential for viral replication.
  • Targeting AP-1A presents a potential strategy for controlling dengue virus infection.