3K9M

Cathepsin B in complex with stefin A

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B [auth C]	d3k9mc_	Alpha and beta proteins (a+b)	Cystatin-like	Cystatin/monellin	Cystatins	Cystatin A (stefin A)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
D	d3k9md_	Alpha and beta proteins (a+b)	Cystatin-like	Cystatin/monellin	Cystatins	Cystatin A (stefin A)	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Cysteine proteinases	8042211	3001808	SCOP2B (2022-06-29)
C [auth B]	SCOP2B Superfamily	Cysteine proteinases	8042211	3001808	SCOP2B (2022-06-29)
B [auth C]	SCOP2B Superfamily	Cystatin/monellin	8043729	3000441	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Cystatin/monellin	8043729	3000441	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Peptidase_C1	e3k9mA1	A: a+b complex topology	X: Cysteine proteinases-like	H: Cysteine proteinases (From Topology)	T: Cysteine proteinases	F: Peptidase_C1	ECOD (1.6)
C [auth B]	Peptidase_C1	e3k9mB1	A: a+b complex topology	X: Cysteine proteinases-like	H: Cysteine proteinases (From Topology)	T: Cysteine proteinases	F: Peptidase_C1	ECOD (1.6)
B [auth C]	Cystatin	e3k9mC1	A: a+b two layers	X: Cystatin-like	H: Cystatin/monellin (From Topology)	T: Cystatin/monellin	F: Cystatin	ECOD (1.6)
D	Cystatin	e3k9mD1	A: a+b two layers	X: Cystatin-like	H: Cystatin/monellin (From Topology)	T: Cystatin/monellin	F: Cystatin	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.70.10	Alpha Beta	Alpha-Beta Complex	Cathepsin B	Chain A	CATH (4.3.0)
C [auth B]	3.90.70.10	Alpha Beta	Alpha-Beta Complex	Cathepsin B	Chain A	CATH (4.3.0)
B [auth C]	3.10.450.10	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)
D	3.10.450.10	Alpha Beta	Roll	Nuclear Transport Factor 2	Chain: A,	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, C [auth B]	PF00112	Papain family cysteine protease (Peptidase_C1)	Papain family cysteine protease	-	Domain
B [auth C], D	PF00031	Cystatin domain (Cystatin)	Cystatin domain	Very diverse family. Attempts to define separate sub-families failed. Typically, either the N-terminal or C-terminal end is very divergent. But splitting into two domains would make very short families. All members except Swiss:Q03196 and Swiss:Q1 ...	Very diverse family. Attempts to define separate sub-families failed. Typically, either the N-terminal or C-terminal end is very divergent. But splitting into two domains would make very short families. All members except Swiss:Q03196 and Swiss:Q10993 are found. Pfam:PF00666 are related to this family but have not been included.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, C [auth B]	Cathepsin B	peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity cysteine-type peptidase activity cysteine-type endopeptidase activity endopeptidase activity collagen binding protein-containing complex binding binding protein binding proteoglycan binding carbohydrate derivative binding	collagen catabolic process catabolic process metabolic process collagen metabolic process organonitrogen compound metabolic process regulation of hormone levels organic hydroxy compound metabolic process cellular metabolic process biological regulation hormone metabolic process cellular modified amino acid metabolic process thyroid hormone metabolic process organic cyclic compound metabolic process organic substance metabolic process collagen catabolic process catabolic process metabolic process collagen metabolic process organonitrogen compound metabolic process regulation of hormone levels organic hydroxy compound metabolic process cellular metabolic process biological regulation hormone metabolic process cellular modified amino acid metabolic process thyroid hormone metabolic process organic cyclic compound metabolic process organic substance metabolic process phenol-containing compound metabolic process cellular process regulation of biological quality thyroid hormone generation organonitrogen compound catabolic process proteolysis involved in protein catabolic process primary metabolic process protein catabolic process macromolecule catabolic process proteolysis protein metabolic process macromolecule metabolic process organic substance catabolic process regulation of biological process regulation of cellular process regulation of apoptotic process apoptotic process regulation of programmed cell death cell death programmed cell death developmental process epithelium development cellular developmental process cell differentiation anatomical structure development tissue development epithelial cell differentiation multi-multicellular organism process multicellular organismal process placenta development reproductive process maternal process involved in female pregnancy multicellular organismal reproductive process animal organ development developmental process involved in reproduction maternal placenta development female pregnancy multi-organism reproductive process decidualization cellular response to stimulus response to organic substance response to thyroid hormone response to stimulus response to endogenous stimulus cellular response to endogenous stimulus cellular response to chemical stimulus response to hormone response to chemical cellular response to organic substance cellular response to thyroid hormone stimulus cellular response to hormone stimulus biological process involved in interspecies interaction between organisms symbiont entry into host cell viral process symbiont entry into host viral life cycle biological process involved in interaction with host biological process involved in symbiotic interaction	cell periphery cell surface membrane plasma membrane cellular anatomical entity external side of plasma membrane side of membrane membrane-bounded organelle intracellular anatomical structure pigment granule intracellular vesicle intracellular membrane-bounded organelle intracellular organelle melanosome cell periphery cell surface membrane plasma membrane cellular anatomical entity external side of plasma membrane side of membrane membrane-bounded organelle intracellular anatomical structure pigment granule intracellular vesicle intracellular membrane-bounded organelle intracellular organelle melanosome cytoplasmic vesicle organelle cytoplasm vesicle apical part of cell plasma membrane region apical plasma membrane extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular space extracellular membrane-bounded organelle extracellular matrix external encapsulating structure collagen-containing extracellular matrix membrane-enclosed lumen lytic vacuole vacuolar lumen endomembrane system intracellular organelle lumen endolysosome endosome lumen lysosome endosome vacuole lysosomal lumen organelle lumen endolysosome lumen ficolin-1-rich granule ficolin-1-rich granule lumen secretory granule secretory vesicle protein-containing complex peptidase inhibitor complex perinuclear region of cytoplasm
B [auth C], D	Cystatin-A	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity molecular function regulator activity enzyme inhibitor activity cysteine-type endopeptidase inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity protein binding binding enzyme binding protease binding	developmental process epithelium development epidermal cell differentiation cellular developmental process epidermis development animal organ development tissue development epithelial cell differentiation skin development cell differentiation keratinocyte differentiation anatomical structure development cellular process negative regulation of hydrolase activity developmental process epithelium development epidermal cell differentiation cellular developmental process epidermis development animal organ development tissue development epithelial cell differentiation skin development cell differentiation keratinocyte differentiation anatomical structure development cellular process negative regulation of hydrolase activity negative regulation of proteolysis regulation of catalytic activity negative regulation of biological process negative regulation of catalytic activity regulation of primary metabolic process negative regulation of peptidase activity organic substance metabolic process regulation of proteolysis proteolysis protein metabolic process negative regulation of protein metabolic process negative regulation of macromolecule metabolic process regulation of biological process organonitrogen compound metabolic process regulation of protein metabolic process negative regulation of metabolic process biological regulation negative regulation of molecular function regulation of peptidase activity primary metabolic process regulation of macromolecule metabolic process regulation of molecular function regulation of hydrolase activity metabolic process macromolecule metabolic process regulation of metabolic process cell adhesion cell-cell adhesion peptide cross-linking macromolecule modification protein modification process	protein-containing complex peptidase inhibitor complex cell periphery plasma membrane membrane cellular anatomical entity cornified envelope intracellular anatomical structure cytoplasm cytosol extracellular region extracellular space membrane-bounded organelle nucleus protein-containing complex peptidase inhibitor complex cell periphery plasma membrane membrane cellular anatomical entity cornified envelope intracellular anatomical structure cytoplasm cytosol extracellular region extracellular space membrane-bounded organelle nucleus membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle nucleoplasm organelle lumen organelle nuclear lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, C [auth B]	IPR025661	Cysteine peptidase, asparagine active site	Active Site
A, C [auth B]	IPR000169	Cysteine peptidase, cysteine active site	Active Site
A, C [auth B]	IPR038765	Papain-like cysteine peptidase superfamily	Homologous Superfamily
A, C [auth B]	IPR012599	Peptidase C1A, propeptide	Domain
A, C [auth B]	IPR013128	Peptidase C1A	Family
A, C [auth B]	IPR000668	Peptidase C1A, papain C-terminal	Domain
A, C [auth B]	IPR025660	Cysteine peptidase, histidine active site	Active Site
B [auth C], D	IPR018073	Proteinase inhibitor I25, cystatin, conserved site	Conserved Site
B [auth C], D	IPR001713	Proteinase inhibitor I25A, stefin	Family
B [auth C], D	IPR000010	Cystatin domain	Domain
B [auth C], D	IPR046350	Cystatin superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, C [auth B]	Pharos: P07858	myopathy glioblastoma renal cell carcinoma chromophobe renal cell carcinoma collecting duct carcinoma proteinuria sarcomatoid renal cell carcinoma giant cell glioblastoma Necrosis prostate cancer keratolytic winter erythema papillary renal cell carcinoma invasive ductal breast carcinoma large cell medulloblastoma lung carcinoma myopathy glioblastoma renal cell carcinoma chromophobe renal cell carcinoma collecting duct carcinoma proteinuria sarcomatoid renal cell carcinoma giant cell glioblastoma Necrosis prostate cancer keratolytic winter erythema papillary renal cell carcinoma invasive ductal breast carcinoma large cell medulloblastoma lung carcinoma medulloblastoma Alzheimer disease breast cancer osteosarcoma pancreatic intraductal papillary-mucinous neoplasm polycystic ovary syndrome cystic fibrosis juvenile dermatomyositis leprosy malignant mesothelioma muscle tissue disease astrocytic tumor breast carcinoma ovarian cancer pancreatitis dilated cardiomyopathy renal carcinoma Duchenne muscular dystrophy subependymal giant cell astrocytoma lung cancer malignant pancreatic neoplasm muscular disease atypical teratoid rhabdoid tumor cancer pancreatic ductal adenocarcinoma clear cell renal carcinoma cutaneous lupus erythematosus gastric carcinoma testicular germ cell tumor
B [auth C], D	Pharos: P01040	peeling skin syndrome 4 glioblastoma nasopharyngeal carcinoma psoriasis giant cell glioblastoma Neoplasm Metastasis malignant pancreatic neoplasm nephrolithiasis pancreatic ductal adenocarcinoma peeling skin syndrome acne atypical teratoid rhabdoid tumor spina bifida cystic fibrosis lung cancer peeling skin syndrome 4 glioblastoma nasopharyngeal carcinoma psoriasis giant cell glioblastoma Neoplasm Metastasis malignant pancreatic neoplasm nephrolithiasis pancreatic ductal adenocarcinoma peeling skin syndrome acne atypical teratoid rhabdoid tumor spina bifida cystic fibrosis lung cancer malignant glioma osteosarcoma pancreatic intraductal papillary-mucinous neoplasm acral peeling skin syndrome sinusitis B-cell chronic lymphocytic leukemia subependymal giant cell astrocytoma dermatomyositis esophageal adenocarcinoma lung carcinoma malignant mesothelioma ovarian cancer pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia pilocytic astrocytoma asthma Sjogren syndrome breast cancer ulcerative colitis exfoliative ichthyosis lung adenocarcinoma malignant ependymoma

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.