Annotations: 9EN2

Crystal structure of the metalloproteinase enhancer PCPE-1 complexed with nanobodies VHH-H4 and VHH-I5

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C	RRM_1	e9en2C01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: RRM_1	ECOD (v295)
B	RRM_1	e9en2B01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: RRM_1	ECOD (v295)
A	RRM_1	e9en2A01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: RRM_1	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C	Heavy Chain	IGHV1	-	procollagen c-endopeptidase enhancer 1	SAbDab (2026-06-26)
B	Heavy Chain	IGHV3	-	procollagen c-endopeptidase enhancer 1	SAbDab (2026-06-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00431	CUB domain (CUB)	CUB domain		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C	VHH-I5	-	-	-
B	VHH-H4	-	-	-
A	Procollagen C-endopeptidase enhancer 1	enzyme regulator activity enzyme activator activity peptidase regulator activity molecular function activator activity molecular function regulator activity peptidase activator activity collagen binding protein-containing complex binding binding heparin binding glycosaminoglycan binding carbohydrate derivative binding sulfur compound binding	biosynthetic process collagen biosynthetic process metabolic process cellular process collagen metabolic process proteolysis primary metabolic process protein metabolic process macromolecule metabolic process	cellular anatomical structure extracellular region extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR001134	Netrin domain	Domain
A	IPR008993	Tissue inhibitor of metalloproteinases-like, OB-fold	Homologous Superfamily
A	IPR035914	Spermadhesin, CUB domain superfamily	Homologous Superfamily
A	IPR035814	Procollagen C-endopeptidase enhancer, NTR domain	Domain
A	IPR000859	CUB domain	Domain
A	IPR018933	Netrin module, non-TIMP type	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: Q15113	cirrhosis of liver malignant pancreatic neoplasm pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia ulcerative colitis breast cancer Drug-Induced Liver Disease Hashimoto thyroiditis interstitial cystitis malignant glioma medulloblastoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma diabetes mellitus drug-induced liver injury cirrhosis of liver malignant pancreatic neoplasm pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia ulcerative colitis breast cancer Drug-Induced Liver Disease Hashimoto thyroiditis interstitial cystitis malignant glioma medulloblastoma pancreatic intraductal papillary-mucinous carcinoma pilocytic astrocytoma diabetes mellitus drug-induced liver injury gastric carcinoma juvenile dermatomyositis malignant mesothelioma ovarian cancer pancreatic intraductal papillary-mucinous neoplasm pituitary cancer Duchenne muscular dystrophy glioblastoma limb-girdle muscular dystrophy

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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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.