Interacts with ATP1B1. Expressed in fetal brain. Weakly expressed in adult brain and thymus. Not expressed in any other normal tissue examined. A chromosomal aberration involving NKAIN2 is a cause of lymphoma. Deletion del(6)(q13q21) within NKAIN2 and involving SUSP1 generates the SUSP1-NKAIN2 product (PubMed:11979551). Belongs to the NKAIN family.