1STF

THE REFINED 2.4 ANGSTROMS X-RAY CRYSTAL STRUCTURE OF RECOMBINANT HUMAN STEFIN B IN COMPLEX WITH THE CYSTEINE PROTEINASE PAPAIN: A NOVEL TYPE OF PROTEINASE INHIBITOR INTERACTION

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)
A [auth E]	d1stfe_	Alpha and beta proteins (a+b)	Cysteine proteinases	Cysteine proteinases	Papain-like	Papain	papaya (Carica papaya ) [TaxId: 3649 ],	SCOPe (2.08)
B [auth I]	d1stfi_	Alpha and beta proteins (a+b)	Cystatin-like	Cystatin/monellin	Cystatins	Cystatin B (stefin B)	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 [auth E]	SCOP2B Superfamily	Cysteine proteinases	8036216	3001808	SCOP2B (2022-06-29)
B [auth I]	SCOP2 Family	Cystatins	8022257	4001013	SCOP2 (2022-06-29)
B [auth I]	SCOP2 Superfamily	Cystatin/monellin	8034637	3000441	SCOP2 (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 [auth E]	Peptidase_C1	e1stfE1	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 I]	Cystatin	e1stfI1	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 [auth E]	3.90.70.10	Alpha Beta	Alpha-Beta Complex	Cathepsin B	Chain A	CATH (4.3.0)
B [auth I]	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 [auth E]	PF00112	Papain family cysteine protease (Peptidase_C1)	Papain family cysteine protease	-	Domain
B [auth I]	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 [auth E]	PAPAIN	protein binding binding serpin family protein binding cysteine-type peptidase activity peptidase activity catalytic activity, acting on a protein hydrolase activity catalytic activity	organic substance metabolic process organonitrogen compound metabolic process proteolysis metabolic process primary metabolic process protein metabolic process macromolecule metabolic process	-
B [auth I]	STEFIN B (CYSTATIN B)	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 RNA binding 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 RNA binding organic cyclic compound binding nucleic acid binding	adult locomotory behavior behavior multicellular organismal process adult behavior locomotory behavior 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 adult locomotory behavior behavior multicellular organismal process adult behavior locomotory behavior 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	membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membrane-bounded organelle cellular anatomical entity nucleolus intracellular organelle lumen intracellular organelle organelle lumen organelle intracellular non-membrane-bounded organelle nuclear lumen non-membrane-bounded organelle membrane-bounded organelle intracellular anatomical structure nucleus membrane-enclosed lumen intracellular membrane-bounded organelle cellular anatomical entity nucleolus intracellular organelle lumen intracellular organelle organelle lumen organelle intracellular non-membrane-bounded organelle nuclear lumen non-membrane-bounded organelle tertiary granule lumen intracellular vesicle endomembrane system tertiary granule cytoplasmic vesicle secretory granule secretory vesicle cytoplasm vesicle extracellular region extracellular exosome extracellular vesicle extracellular organelle extracellular space extracellular membrane-bounded organelle vesicle lumen cytoplasmic vesicle lumen secretory granule lumen cell periphery extracellular matrix external encapsulating structure collagen-containing extracellular matrix cytosol ficolin-1-rich granule ficolin-1-rich granule lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth E]	IPR038765	Papain-like cysteine peptidase superfamily	Homologous Superfamily
A [auth E]	IPR025661	Cysteine peptidase, asparagine active site	Active Site
A [auth E]	IPR000169	Cysteine peptidase, cysteine active site	Active Site
A [auth E]	IPR025660	Cysteine peptidase, histidine active site	Active Site
A [auth E]	IPR013128	Peptidase C1A	Family
A [auth E]	IPR000668	Peptidase C1A, papain C-terminal	Domain
A [auth E]	IPR013201	Cathepsin propeptide inhibitor domain (I29)	Domain
A [auth E]	IPR039417	Papain-like cysteine endopeptidase	Domain
B [auth I]	IPR018073	Proteinase inhibitor I25, cystatin, conserved site	Conserved Site
B [auth I]	IPR001713	Proteinase inhibitor I25A, stefin	Family
B [auth I]	IPR000010	Cystatin domain	Domain
B [auth I]	IPR046350	Cystatin superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B [auth I]	Pharos: P04080	Unverricht-Lundborg syndrome meningioma esophageal squamous cell carcinoma glioblastoma secretory meningioma transitional meningioma microcystic meningioma benign meningioma clear cell meningioma spinal meningioma intraorbital meningioma angiomatous meningioma olfactory groove meningioma parasagittal meningioma psammomatous meningioma Unverricht-Lundborg syndrome meningioma esophageal squamous cell carcinoma glioblastoma secretory meningioma transitional meningioma microcystic meningioma benign meningioma clear cell meningioma spinal meningioma intraorbital meningioma angiomatous meningioma olfactory groove meningioma parasagittal meningioma psammomatous meningioma fibrous meningioma intraventricular meningioma meningothelial meningioma Neoplasm Invasiveness cerebral convexity meningioma giant cell glioblastoma large cell medulloblastoma lymphoplasmacyte-rich meningioma neurodegenerative disease ovarian cancer papillary meningioma epilepsy progressive myoclonus epilepsy intellectual disability lung adenocarcinoma nasopharyngeal carcinoma breast cancer pancreatic ductal adenocarcinoma cutaneous lupus erythematosus subependymal giant cell astrocytoma interstitial cystitis lung cancer malignant pancreatic neoplasm osteosarcoma pancreatic intraductal papillary-mucinous neoplasm Down syndrome esophageal adenocarcinoma psoriasis

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.