##gff-version 3 P28077 UniProtKB Propeptide 1 20 . . . ID=PRO_0000026631;Note=Removed in mature form;Ontology_term=ECO:0000269;evidence=ECO:0000269|PubMed:2335214;Dbxref=PMID:2335214 P28077 UniProtKB Chain 21 219 . . . ID=PRO_0000026632;Note=Proteasome subunit beta type-9 P28077 UniProtKB Active site 21 21 . . . Note=Nucleophile;Ontology_term=ECO:0000250;evidence=ECO:0000250 P28077 UniProtKB Site 20 21 . . . Note=Cleavage%3B by autolysis;Ontology_term=ECO:0000250;evidence=ECO:0000250|UniProtKB:O35955 P28077 UniProtKB Modified residue 53 53 . . . Note=N6-acetyllysine;Ontology_term=ECO:0000250;evidence=ECO:0000250|UniProtKB:P28065 P28077 UniProtKB Modified residue 109 109 . . . Note=N6-acetyllysine;Ontology_term=ECO:0000250;evidence=ECO:0000250|UniProtKB:P28065