Enables calcium ion binding activity; double-stranded DNA binding activity; and purine nucleotide binding activity. Predicted to be involved in chromosome condensation. Predicted to act upstream of or within histone lysine methylation; negative regulation of transcription by RNA polymerase II; and nucleosome positioning. Part of nucleosome. Orthologous to human H1-4 (H1.4 linker histone, cluster member). [provided by Alliance of Genome Resources, Apr 2022]