Data for: Self-assembling viral histones are evolutionary intermediates between archaeal and eukaryotic nucleosomes

Data associated with the manuscript, "Self-assembling viral histones are evolutionary intermediates between archaeal and eukaryotic nucleosomes". Included are predicted proteomes from cellular organisms and viruses, hidden Markov models (HMMs), the protein sequences for viral histones, histone alignments and phylogenies, a set of chromatin proteins identified in Nucleocytoviricota viruses, Alpha-fold predicted structures of histone quadruplets, expression vector and construct sequences, unedited gel and blot images, and raw microscopy images.