Deubiquitinating enzyme that plays a role in behavior, possibly by regulating GABA action. May act by mediating the deubiquitination of GAD1/GAD67 (By similarity). Has almost no deubiquitinating activity by itself and requires the interaction with WDR48 to have a high activity (PubMed:19075014, PubMed:26388029). Not involved in deubiquitination of monoubiquitinated FANCD2 (PubMed:19075014). {ECO:0000250|UniProtKB:P62069, ECO:0000269|PubMed:19075014, ECO:0000269|PubMed:26388029}. This is the function of Ensembl gene identifier ENSG00000109189 (USP46, ubiquitin specific peptidase 46).