Required for the A-I editing activity of the double-stranded RNA-specific adenosine deaminase adr-2 by facilitating adr-2 nuclear localization. Interacts with double-stranded RNA-specific adenosine deaminase adr-2. Expressed in main body hypodermal cells, the hypodermal seam cells, pharynx, intestine and some neurons. Expression starts in the embryo and continues through young adulthood with lower levels in older adults.