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A jumbo cyanophage encodes the most complete ribosomal protein set in the known virosphere

Meza-Padilla I, Avrani S, Müller KM, Nissimov JI

bioRxiv : the preprint server for biology, 2026

Abstract

Viruses encode ribosomal proteins (RPs), but their genomes usually harbor a single RP-coding gene. Here, we reannotate the genome of the jumbo cyanophage PhiMa05 and show that it encodes six RPs, an RP acetyltransferase, and a ribosome biogenesis protein. Evolutionary analyses suggest that these viral RP-coding genes may have been horizontally transferred to certain members of the Vampirovibrionia, a non-photosynthetic basal lineage of Cyanobacteriota, via integration of the viral genome.

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