ArticlePlants (Basel, Switzerland)2026
BBTV Nuclear Shuttle Protein Mediates Banana Ubiquitination Pathway Dysregulation.
Article in Plants (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
Banana bunchy top virus (BBTV) is a devastating pathogen threatening global banana production. The plant ubiquitin-proteasome system (UPS) governs immune signaling and is frequently subverted by invading viruses, yet the molecular mechanism through which BBTV interferes with host UPS remains unclear. Here, we show that BBTV nuclear shuttle protein (NSP) serves as the core viral effector to disrupt banana ubiquitination homeostasis. RT-qPCR time-series assays confirmed that BBTV infection dynamically remodels the transcription of eight phylogenetically divergent RING-type E3 ubiquitin ligases: four subfamily I E3-SIS3 paralogs and E3-HIP1 are significantly upregulated at 14 dpi and 21 dpi, while E3-BOI and E3-RHA1B are suppressed at 21 dpi. Transient expression screening of all six BBTV-encoded proteins verified that only NSP reproduces the UPS perturbation signature triggered by viral infection. Cross-species sequence alignment identified an evolutionarily conserved FNGSF motif within NSP orthologs of all
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