RUNX1 permits E4orf6-directed nuclear localization of the adenovirus E1B-55K protein and associates with centers of viral DNA and RNA synthesis.

Journal of Virology
Leslie J MarshallDavid A Ornelles

Abstract

The localization of the adenovirus E1B-55K-E4orf6 protein complex is critical for its function. Prior studies demonstrated that E4orf6 directs the nuclear localization of E1B-55K in human cells and in rodent cells that contain part of human chromosome 21. We show here that the relevant activity on chromosome 21 maps to RUNX1. RUNX1 proteins are transcription factors that serve as scaffolds for the assembly of proteins that regulate transcription and RNA processing. After transfection, the RUNX1a, RUNX1b, and RUNX1-DeltaN variants allowed E4orf6-directed E1B-55K nuclear localization. The failure of RUNX1c to allow nuclear colocalization was relieved by the deletion of amino-terminal residues of this protein. In the adenovirus-infected mouse cell, RUNX1 proteins were localized to discrete structures about the periphery of viral replication centers. These sites are enriched in viral RNA and RNA-processing factors. RUNX1b and RUNX1a proteins displaced E4orf6 from these sites. The association of E1B-55K at viral replication centers was enhanced by the RUNX1a and RUNX1b proteins, but only in the absence of E4orf6. In the presence of E4orf6, E1B-55K occurred in a perinuclear cytoplasmic body resembling the aggresome and was excluded f...Continue Reading

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Citations

May 22, 2010·Archives of Virology·Satoshi YamasakiMasato Yamamoto
Feb 13, 2009·Journal of Virology·Andrew N Blackford, Roger J A Grand
Nov 12, 2019·FEBS Letters·Paloma Hidalgo, Ramón A Gonzalez
Nov 27, 2019·FEBS Letters·Paloma HidalgoRamón A Gonzalez
Dec 29, 2020·Virus Research·Samuel HofmannSabrina Schreiner

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