Predicted to enable DNA-binding transcription activator activity, RNA polymerase II-specific and RNA polymerase II transcription regulatory region sequence-specific DNA binding activity. Predicted to be involved in regulation of transcription by RNA polymerase II. Predicted to act upstream of or within regulation of DNA-templated transcription; regulation of apoptotic process; and rhythmic process. Predicted to be part of ATF1-ATF4 transcription factor complex and ATF4-CREB1 transcription factor complex. Predicted to be active in nucleus. Human ortholog(s) of this gene implicated in prostate carcinoma. Orthologous to human ATF4 (activating transcription factor 4).