Late protein that plays a role in intracellular enveloped virus (IEV) transport to the cell surface on microtubules. Together with protein F12, forms a complex that interacts with host KLC2 (kinesin light chain isoform 2) to engage the kinesin-1 complex and thereby promote IEV trafficking. Interacts with host KLC2; this interaction promotes IEV trafficking by engaging the host kinesin-1 complex. Interacts with protein F12. Belongs to the poxviridae E2 protein family.