Part of signaling pathway that is required for completion of cytokinesis. gapA and rgaA control cortexillin localization to the cleavage furrow and hence may be involved in cleavage of the midbody in the final stage of cytokinesis by regulating the actin cytoskeleton. Forms a complex by linking activated rac1A to ctxA in the absence of rgaA. Assembly of this complex is necessary for the recruitment of cortexillin to the midzone of the dividing cell