Enables histone binding activity and ubiquitin protein ligase activity. Involved in DNA metabolic process; histone ubiquitination; and spermatogenesis, exchange of chromosomal proteins. Located in chromosome, telomeric region; cytoplasm; and nucleus. Is expressed in central nervous system; genitourinary system; nasal cavity epithelium; and thymus primordium. Orthologous to human RNF8 (ring finger protein 8). [provided by Alliance of Genome Resources, Apr 2022]