Annotations: 9YRQ

Factor XIa in complex with Fab fragment of REGN9933-A2

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Thera-SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
H [auth D]	SCOP2B Superfamily	Trypsin-like serine proteases	8044201	3000114	SCOP2B (2022-06-29)
G [auth B]	SCOP2B Superfamily	Trypsin-like serine proteases	8044201	3000114	SCOP2B (2022-06-29)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
B [auth H], E [auth F]	Amrecibart	F11	Therapeutic SAbDab (2026-07-31)
C [auth L], F [auth E]	Amrecibart	F11	Therapeutic SAbDab (2026-07-31)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, D [auth C], G [auth B], H [auth D]	PF00089	Trypsin (Trypsin)	Trypsin		Domain
A, D [auth C], G [auth B], H [auth D]	PF00024	PAN domain (PAN_1)	PAN domain	The PAN domain [1] contains a conserved core of three disulphide bridges. In some members of the family there is an additional fourth disulphide bridge the links the N and C termini of the domain. The domain is found in diverse proteins, in some the ...	The PAN domain [1] contains a conserved core of three disulphide bridges. In some members of the family there is an additional fourth disulphide bridge the links the N and C termini of the domain. The domain is found in diverse proteins, in some they mediate protein-protein interactions, in others they mediate protein-carbohydrate interactions.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth H], E [auth F]	REGN9933 Fab Heavy Chain	-	-	-
C [auth L], F [auth E]	REGN9933 Light Chain	-	-	-
A, D [auth C], G [auth B], H [auth D]	Coagulation factor XI	serine-type exopeptidase activity peptidase activity serine-type aminopeptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity aminopeptidase activity hydrolase activity exopeptidase activity catalytic activity serine-type endopeptidase activity endopeptidase activity heparin binding glycosaminoglycan binding serine-type exopeptidase activity peptidase activity serine-type aminopeptidase activity catalytic activity, acting on a protein serine hydrolase activity serine-type peptidase activity aminopeptidase activity hydrolase activity exopeptidase activity catalytic activity serine-type endopeptidase activity endopeptidase activity heparin binding glycosaminoglycan binding binding carbohydrate derivative binding sulfur compound binding identical protein binding protein binding	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	cellular anatomical structure membrane extracellular region extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle organelle vesicle extracellular membrane-bounded organelle cell periphery plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, D [auth C], G [auth B], H [auth D]	IPR000177	Apple domain	Domain
A, D [auth C], G [auth B], H [auth D]	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
A, D [auth C], G [auth B], H [auth D]	IPR001314	Peptidase S1A, chymotrypsin family	Family
A, D [auth C], G [auth B], H [auth D]	IPR033116	Serine proteases, trypsin family, serine active site	Active Site
A, D [auth C], G [auth B], H [auth D]	IPR001254	Serine proteases, trypsin domain	Domain
A, D [auth C], G [auth B], H [auth D]	IPR018114	Serine protease-like, trypsin family, histidine active site	Active Site
A, D [auth C], G [auth B], H [auth D]	IPR003609	PAN/Apple domain	Domain
A, D [auth C], G [auth B], H [auth D]	IPR043504	Peptidase_S1_PA_chymotrypsin	Unknown

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, D [auth C], G [auth B], H [auth D]	: P03951	congenital factor XI deficiency hypertensive disorder cerebrovascular disorder lung carcinoma pancreatic ductal adenocarcinoma pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia lung adenocarcinoma malignant pancreatic neoplasm pancreatic intraductal papillary-mucinous carcinoma thrombotic disease factor XI deficiency lung cancer non-small cell lung carcinoma pancreatic intraductal papillary-mucinous neoplasm vascular 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.