Enables DNA-binding transcription activator activity, RNA polymerase II-specific. Involved in several processes, including positive regulation of neuron projection development; response to endoplasmic reticulum stress; and response to wounding. Located in chromatin; nucleus; and perinuclear endoplasmic reticulum. Orthologous to human CREB3L2 (cAMP responsive element binding protein 3 like 2). [provided by Alliance of Genome Resources, Apr 2022]