Enables N6-threonylcarbomyladenosine methylthiotransferase activity. Acts upstream of or within maintenance of translational fidelity and tRNA methylthiolation. Located in rough endoplasmic reticulum. Is expressed in olfactory epithelium and testis. Used to study type 2 diabetes mellitus. Human ortholog(s) of this gene implicated in diabetes mellitus; gestational diabetes; and type 2 diabetes mellitus. Orthologous to human CDKAL1 (CDK5 regulatory subunit associated protein 1 like 1). [provided by Alliance of Genome Resources, Apr 2022]