Component of the Sca1 complex, a regulator of cell motility, chemotaxis and signal relay (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). Display directionality defects during chemotaxis and increased motility (PubMed:20493808).