May inhibit the adenylyl cyclase-stimulating activity of guanine nucleotide-binding protein G(s) subunit alpha which is produced from the same locus in a different open reading frame. Interacts with the N-terminal region of the XLas isoforms of guanine nucleotide-binding protein G(s) subunit alpha. Predominantly associated with cell membrane ruffles. This protein is produced by a bicistronic gene which also produces the guanine nucleotide-binding protein G(s) subunit alpha from an overlapping reading frame. Belongs to the ALEX family.