Taspase 1 (threonine aspartase 1) and similar proteins
Taspase1 catalyzes the cleavage of the mix lineage leukemia (MLL) nuclear protein and transcription factor TFIIA. Taspase1 is a threonine aspartase, a member of the Ntn hydrolase superfamily and the type 2 asparaginase family. A threonine residue acts as the active site nucleophile in both endopeptidease and protease activities to cleave polypeptide substrates after an aspartate residue. The Taspase1 proenzyme undergoes autoproteolysis into alpha and beta subunits. The N-terminal residue of the beta subunit is a threonine which is the active catalytic residue. The active enzyme is a heterotetramer.
Jiyao W et al.(2023). "The conserved domain database in 2023.",