Annotations: 4MSX

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	PF00443	e4msxA1	A: a+b complex topology	X: Cysteine proteinases-like	H: Cysteine proteinases (From Topology)	T: Cysteine proteinases	F: PF00443	ECOD (1.6)
A	PF02148	e4msxA2	A: few secondary structure elements	X: RING/U-box-like	H: RING/U-box-like	T: RING/U-box	F: PF02148	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.40.10	Alpha Beta	2-Layer Sandwich	Herpes Virus-1	Zinc/RING finger domain, C3HC4 (zinc finger)	CATH (4.3.0)
A	3.90.70.10	Alpha Beta	Alpha-Beta Complex	Cathepsin B	Chain A	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF02148	Zn-finger in ubiquitin-hydrolases and other protein (zf-UBP)	Zn-finger in ubiquitin-hydrolases and other protein	-	Domain
A	PF00443	Ubiquitin carboxyl-terminal hydrolase (UCH)	Ubiquitin carboxyl-terminal hydrolase	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Pre-mRNA-splicing factor SAD1	cysteine-type peptidase activity ubiquitin-like protein peptidase activity peptidase activity cysteine-type deubiquitinase activity catalytic activity, acting on a protein hydrolase activity catalytic activity deubiquitinase activity cation binding transition metal ion binding zinc ion binding ion binding binding metal ion binding cysteine-type peptidase activity ubiquitin-like protein peptidase activity peptidase activity cysteine-type deubiquitinase activity catalytic activity, acting on a protein hydrolase activity catalytic activity deubiquitinase activity cation binding transition metal ion binding zinc ion binding ion binding binding metal ion binding small molecule binding	ribonucleoprotein complex biogenesis cellular biosynthetic process RNA metabolic process mRNA processing protein-RNA complex assembly cellular component organization cellular component biogenesis nucleobase-containing compound metabolic process spliceosomal complex assembly protein-RNA complex organization cellular component assembly organic substance metabolic process protein-containing complex assembly organic substance biosynthetic process ribonucleoprotein complex biogenesis cellular biosynthetic process RNA metabolic process mRNA processing protein-RNA complex assembly cellular component organization cellular component biogenesis nucleobase-containing compound metabolic process spliceosomal complex assembly protein-RNA complex organization cellular component assembly organic substance metabolic process protein-containing complex assembly organic substance biosynthetic process cellular component organization or biogenesis RNA processing RNA splicing protein-containing complex organization cellular metabolic process primary metabolic process gene expression mRNA metabolic process macromolecule biosynthetic process nucleic acid metabolic process organic cyclic compound metabolic process biosynthetic process RNA splicing, via transesterification reactions mRNA splicing, via spliceosome cellular process metabolic process RNA splicing, via transesterification reactions with bulged adenosine as nucleophile macromolecule metabolic process	membrane-bounded organelle protein-containing complex intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle spliceosomal complex organelle ribonucleoprotein complex spliceosomal snRNP complex Sm-like protein family complex U4/U6 x U5 tri-snRNP complex membrane-bounded organelle protein-containing complex intracellular anatomical structure nucleus nuclear protein-containing complex intracellular membrane-bounded organelle cellular anatomical entity intracellular organelle spliceosomal complex organelle ribonucleoprotein complex spliceosomal snRNP complex Sm-like protein family complex U4/U6 x U5 tri-snRNP complex spliceosomal tri-snRNP complex small nuclear ribonucleoprotein complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR028889	Ubiquitin specific protease domain	Domain
A	IPR033809	USP39	Family
A	IPR013083	Zinc finger, RING/FYVE/PHD-type	Homologous Superfamily
A	IPR001607	Zinc finger, UBP-type	Domain
A	IPR001394	Peptidase C19, ubiquitin carboxyl-terminal hydrolase	Domain
A	IPR038765	Papain-like cysteine peptidase superfamily	Homologous Superfamily

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.