Predicted to contribute to Atg8-family ligase activity. Involved in autophagosome assembly and regulation of autophagy. Predicted to be located in phagophore assembly site membrane. Predicted to be part of Atg12-Atg5-Atg16 complex. Human ortholog(s) of this gene implicated in autosomal recessive spinocerebellar ataxia 25. Is an ortholog of human ATG5 (autophagy related 5).