Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. G alpha-2 is required for the early aggregation process and most of the known cAMP receptor-mediated responses. Interacts with downstream effector gflB, a Rap guanine nucleotide exchange factor, to regulate the balance between Ras and Rap signaling at the leading edge of chemotaxing cells