Contributes to the nuclear transport of the viral transcriptional activator VP16 during the early phase of infection. Therefore, participates indirectly in the regulation of the immediate-early gene expression. Additionally, seems to be important for efficient nuclear targeting of capsids. The UL51-UL14 complex regulates final viral envelopment for efficient viral replication (PubMed:27440890). Interacts with UL51. Phosphorylated. Belongs to the alphaherpesvirinae HHV-1 UL14 protein family.