Contributes to guanyl-nucleotide exchange factor activity. Involved in several processes, including hippocampus development; response to glucose; and response to heat. Part of eukaryotic translation initiation factor 2B complex. Human ortholog(s) of this gene implicated in leukoencephalopathy with vanishing white matter. Orthologous to human EIF2B3 (eukaryotic translation initiation factor 2B subunit gamma). [provided by Alliance of Genome Resources, Apr 2022]