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These activate cellular responses to their removal, including intracellular protein degradation activities. Protein ubiquitylation is involved in two major degradation pathways, the ubiquitin-proteasome system and selective autophagy. In humans, the ubiquitin-like modifier-activating enzyme 1 (UBA1) is the primary E1 enzyme in the ubiquitin conjugation cascade. Viruses have evolved to exploit protein degradation pathways to complete their infection cycles. Zika virus (ZIKV) is an emerging orthoflavivirus causing serious neurologic disorders in neonates (congenital microcephaly) and adults (Guillain\u2013Barr\u00e9 syndrome). Non-structural protein 5 (NS5), the largest and most conserved protein in the orthoflaviviruses, catalyses the synthesis and capping of new viral genomes. In addition to viral RNA replication in the cytoplasm, ZIKV NS5 is translocated into the nucleus to interfere with host antiviral responses. Here, we demonstrate that ZIKV NS5 co-immunoprecipitates with cellular UBA1. Immunofluorescence assays suggest that this interaction takes place primarily in the nucleus of an infected cell, although colocalization of both proteins is also detected in the cytosol. RNA interference-mediated depletion of UBA1 leads to reduced virus titres in the infected cells, while transient overexpression of UBA1 favours faster replication kinetics, with higher virus titres and protein levels detected. Moreover, UBA1-targeting drugs cause significant drops in virus infectivity. 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