DCB domain is found at the N-terminal of Mon2 and BIG1-like proteins from metazoa, and in fungal homologues like Sec7 and Gea1/2 [3,4]. Mon2 and BIG1 like proteins play an important role in the cytoplasm-to-vacuole transport pathway and are required for Golgi homeostasis [1,2]. This domain is sufficient for targeting BIG1 to the Golgi.

1: Yeast Mon2p is a highly conserved protein that functions in the cytoplasm-to-vacuole transport pathway and is required for Golgi homeostasis. Efe JA, Plattner F, Hulo N, Kressler D, Emr SD, Deloche O; J Cell Sci. 2005;118:4751-4764. PMID:16219684

2: Mon2, a relative of large Arf exchange factors, recruits Dop1 to the Golgi apparatus. Gillingham AK, Whyte JR, Panic B, Munro S; J Biol Chem. 2006;281:2273-2280. PMID:16301316

3: Structural Insights into Arl1-Mediated Targeting of the Arf-GEF BIG1 to the trans-Golgi. Galindo A, Soler N, McLaughlin SH, Yu M, Williams RL, Munro S; Cell Rep. 2016;16:839-850. PMID:27373159

4: The Sec7 N-terminal regulatory domains facilitate membrane-proximal activation of the Arf1 GTPase. Richardson BC, Halaby SL, Gustafson MA, Fromme JC; Elife. 2016; [Epub ahead of print] PMID:26765562