RIC1 has been identified in yeast as a Golgi protein involved in retrograde transport to the cis-Golgi network. It forms a heterodimer with Rgp1 and functions as a guanyl-nucleotide exchange factor [1].

1: Ric1p and Rgp1p form a complex that catalyses nucleotide exchange on Ypt6p. Siniossoglou S, Peak-Chew SY, Pelham HR; EMBO J. 2000;19:4885-4894. PMID:10990452