Ras-bound GDP/GTP exchange factor required for normal activation of adenylyl cyclase (PubMed:17380187). Component of the Sca1 complex, a regulator of cell motility, chemotaxis and signal relay (PubMed:8793298, PubMed:16234315, PubMed:20493808). The Sca1 complex is recruited to the plasma membrane in a chemoattractant- and F-actin-dependent manner and is enriched at the leading edge of chemotaxing cells where it regulates F-actin dynamics and signal relay by controlling the activation of rasC and the downstream target of rapamycin complex 2 (TORC2)-Akt/protein kinase B (PKB) pathway (PubMed:20493808). Component of the Sca1 complex composed of at least gefA, gefH, scaA, phr, and the protein phosphatase 2A subunits pppA and pho2B (PubMed:20493808). Interacts directly with gefH (PubMed:20493808). The Sca1 complex is recruited to the plasma membrane in a chemoattractant- and F-actin-dependent manner and is enriched at the leading edge of chemotaxing cells (PubMed:20493808). Membrane localization of the Sca1 complex is regulated by scaA phosphorylation by PKB and PKB-related PKBR1 (PubMed:20493808). Expressed during development; especially until 8 hours of development (PubMed:16086850). Expression is higher in the tip regions of slugs and early culminants (PubMed:11422293). Grows at a normal rate, but are severely impaired in both chemotaxis and activation of adenylyl cyclase, both of which are critical for the early stages of development (PubMed:8793298, PubMed:10473630, PubMed:20493808). Unable to aggregate (PubMed:8793298).