Annotations: 8FGX

Cryo-EM structure of the STAR-0215 Fab in complex with active human plasma kallikrein

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Thera-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		e8fgxC1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.2)
B		e8fgxB1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.2)
A		e8fgxA1	A: beta barrels	X: RNase A-like	H: RNase A-like	T: RNase A-like	F:	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	plasma kallikrein light chain	SAbDab (2026-05-08)
A	Light Chain	IGKV1	Kappa	plasma kallikrein light chain	SAbDab (2026-05-08)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
B	Navenibart	KLKB1	Therapeutic SAbDab (2026-05-08)
A	Navenibart	KLKB1	Therapeutic SAbDab (2026-05-08)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C	PF00089	Trypsin (Trypsin)	Trypsin		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C	Plasma kallikrein light chain	peptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity hydrolase activity serine-type endopeptidase activity catalytic activity endopeptidase activity	multicellular organismal process regulation of body fluid levels wound healing response to stimulus hemostasis biological regulation blood coagulation response to stress coagulation regulation of biological quality response to wounding regulation of response to external stimulus negative regulation of biological process positive regulation of biological process multicellular organismal process regulation of body fluid levels wound healing response to stimulus hemostasis biological regulation blood coagulation response to stress coagulation regulation of biological quality response to wounding regulation of response to external stimulus negative regulation of biological process positive regulation of biological process regulation of response to wounding regulation of coagulation regulation of response to stress regulation of multicellular organismal process regulation of hemostasis regulation of biological process negative regulation of response to stimulus negative regulation of wound healing regulation of blood coagulation negative regulation of blood coagulation response to external stimulus negative regulation of response to wounding positive regulation of fibrinolysis negative regulation of hemostasis fibrinolysis negative regulation of coagulation regulation of fibrinolysis regulation of response to stimulus negative regulation of response to external stimulus regulation of wound healing negative regulation of multicellular organismal process zymogen activation primary metabolic process gene expression macromolecule biosynthetic process protein maturation biosynthetic process proteolysis protein processing metabolic process cellular process protein metabolic process macromolecule metabolic process plasminogen activation regulation of protein maturation positive regulation of protein maturation regulation of cellular process positive regulation of macromolecule biosynthetic process positive regulation of protein processing regulation of primary metabolic process kinin cascade positive regulation of metabolic process regulation of proteolysis positive regulation of macromolecule metabolic process protein activation cascade regulation of protein metabolic process regulation of inflammatory response regulation of gene expression positive regulation of proteolysis regulation of protein processing regulation of acute inflammatory response regulation of macromolecule biosynthetic process inflammatory response regulation of metabolic process regulation of defense response positive regulation of protein metabolic process activation of plasma proteins involved in acute inflammatory response plasma kallikrein-kinin cascade positive regulation of biosynthetic process Factor XII activation acute inflammatory response positive regulation of cellular process regulation of biosynthetic process defense response regulation of macromolecule metabolic process positive regulation of gene expression	cellular anatomical structure extracellular region extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cell periphery plasma membrane membrane
B	STAR-0215 Heavy chain	-	-	-
A	STAR-0215 Light chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C	IPR000177	Apple domain	Domain
C	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
C	IPR001314	Peptidase S1A, chymotrypsin family	Family
C	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
C	IPR001254	Serine proteases, trypsin domain	Domain
C	IPR003609	PAN/Apple domain	Domain
C	IPR018114	Serine proteases, trypsin family, histidine active site	Active Site
C	IPR043504	Peptidase_S1_PA_chymotrypsin	Unknown

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
C	: P03952	carotid artery thrombosis inherited prekallikrein deficiency prekallikrein deficiency pulmonary embolism angioedema Common Carotid Artery Thrombosis hereditary angioedema lung cancer ovarian cancer lung carcinoma vascular disease cerebrovascular disorder osteosarcoma thrombotic disease

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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.