This region is found in the beta subunit of the 5'-AMP-activated protein kinase complex, and its yeast homologues Sip1, Sip2 and Gal83, which are found in the SNF1 kinase complex [1]. This region is sufficient for interaction of this subunit with the kinase complex, but is not solely responsible for the interaction, and the interaction partner is not known [2]. The isoamylase N-terminal domain (Pfam:PF02922) is sometimes found in proteins belonging to this family.

1: Non-catalytic beta- and gamma-subunit isoforms of the 5'-AMP-activated protein kinase. Gao G, Fernandez CS, Stapleton D, Auster AS, Widmer J, Dyck JR, Kemp BE, Witters LA; J Biol Chem 1996;271:8675-8681. PMID:8621499

2: A family of proteins containing a conserved domain that mediates interaction with the yeast SNF1 protein kinase complex. Yang X, Jiang R, Carlson M; EMBO J 1994;13:5878-5886. PMID:7813428