Yeast adenylate cyclase (CYAA/CYR1) is required for cAMP production and cAMP-dependent protein kinase signaling. It scaffold protein for Ras2-Ira interaction [1]. This is the C-terminal domain which contains a second Ras binding site (the first resides in the LRR region) which is involved in a GTP-independent weak interaction between Ras and a complex of adenylate cyclase and Srv2 protein [1]. These two Ras binding sites are required for normal Ras2 downregulation [1].

1: Evidence for adenylate cyclase as a scaffold protein for Ras2-Ira interaction in Saccharomyces cerevisie. Colombo S, Paiardi C, Pardons K, Winderickx J, Martegani E; Cell Signal. 2014;26:1147-1154. PMID:24518043