6I3Z | pdb_00006i3z

Fab fragment of an antibody selective for wild-type alpha-1-antitrypsin in complex with its antigen

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
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)
D [auth L]	d6i3zl2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
D [auth L]	d6i3zl1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)
C [auth H]	d6i3zh_	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	V set domains (antibody variable domain-like)	automated matches	(Mus musculus ) [TaxId: 10090 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Serpins	8037305	3001563	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)
D [auth L]	C1-set_4	e6i3zL2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_4	ECOD (1.6)
D [auth L]	V-set	e6i3zL1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set	ECOD (1.6)
C [auth H]	C1-set_1	e6i3zH2	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: C1-set_1	ECOD (1.6)
C [auth H]	V-set_12	e6i3zH1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: V-set_12	ECOD (1.6)
A	Serpin	e6i3zA1	A: a+b complex topology	X: Serpins (From Topology)	H: Serpins (From Topology)	T: Serpins	F: Serpin	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	3.30.497.10	Alpha Beta	2-Layer Sandwich	Antithrombin	Chain I, domain 2	CATH (utative)
A	2.30.39.10	Mainly Beta	Roll	Alpha-1-antitrypsin	domain 1	CATH (utative)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
D [auth L]	Fab 2H2, anti-SERPINA1 (alpha-1 antitrypsine)	L-KAPPA	Mus musculus (house mouse)	IGKV14-11101, IGIJ1S101, IGIJ1S201, IGKC01, IGKC*02	V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA	IG	FAB-GAMMA-1_KAPPA	IMGT (202550-0)
C [auth H]	Fab 2H2, anti-SERPINA1 (alpha-1 antitrypsine)	VH-CH1	Mus musculus (house mouse)	IGHV5-12-101, IGHJ201, IGHG1*02	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_KAPPA	IMGT (202550-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D [auth L]	Light Chain	IGKV14	Kappa	alpha-1-antitrypsin \| alpha-1-antitrypsin	SAbDab (2025-12-26)
C [auth H]	Heavy Chain	IGHV5	-	alpha-1-antitrypsin \| alpha-1-antitrypsin	SAbDab (2025-12-26)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00079	Serpin (serine protease inhibitor) (Serpin)	Serpin (serine protease inhibitor)	Structure is a multi-domain fold containing a bundle of helices and a beta sandwich.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth L]	Fab 2H2 light chain	-	-	-
C [auth H]	Fab 2H2 heavy chain	-	-	-
B	Alpha-1-antitrypsin	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity serine-type endopeptidase inhibitor activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity protein binding binding enzyme binding protease binding identical 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 acute-phase response defense response inflammatory response 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 acute-phase response defense response inflammatory response acute inflammatory response	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum extracellular region membrane bounding membrane of organelle endoplasmic reticulum-Golgi intermediate compartment membrane endoplasmic reticulum-Golgi intermediate compartment organelle membrane extracellular exosome extracellular vesicle extracellular organelle extracellular space vesicle extracellular membrane-bounded organelle vesicle lumen intracellular vesicle cytoplasmic vesicle lumen secretory granule lumen cytoplasmic vesicle secretory granule secretory vesicle platelet alpha granule platelet alpha granule lumen COPII-coated ER to Golgi transport vesicle coated vesicle ficolin-1-rich granule ficolin-1-rich granule lumen
A	Alpha-1-antitrypsin	enzyme regulator activity molecular function inhibitor activity peptidase regulator activity serine-type endopeptidase inhibitor activity molecular function regulator activity enzyme inhibitor activity peptidase inhibitor activity endopeptidase regulator activity endopeptidase inhibitor activity protein binding binding enzyme binding protease binding identical 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 acute-phase response defense response inflammatory response 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 acute-phase response defense response inflammatory response acute inflammatory response	membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum membrane-bounded organelle intracellular organelle cellular anatomical structure intracellular anatomical structure Golgi apparatus organelle cytoplasm intracellular membrane-bounded organelle endomembrane system membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum extracellular region membrane bounding membrane of organelle endoplasmic reticulum-Golgi intermediate compartment membrane endoplasmic reticulum-Golgi intermediate compartment organelle membrane extracellular exosome extracellular vesicle extracellular organelle extracellular space vesicle extracellular membrane-bounded organelle vesicle lumen intracellular vesicle cytoplasmic vesicle lumen secretory granule lumen cytoplasmic vesicle secretory granule secretory vesicle platelet alpha granule platelet alpha granule lumen COPII-coated ER to Golgi transport vesicle coated vesicle ficolin-1-rich granule ficolin-1-rich granule lumen

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
B	IPR023795	Serpin, conserved site	Conserved Site
B	IPR000215	Serpin family	Family
B	IPR023796	Serpin domain	Domain
B	IPR042178	Serpin superfamily, domain 1	Homologous Superfamily
B	IPR042185	Serpin superfamily, domain 2	Homologous Superfamily
B	IPR036186	Serpin superfamily	Homologous Superfamily
A	IPR023795	Serpin, conserved site	Conserved Site
A	IPR000215	Serpin family	Family
A	IPR023796	Serpin domain	Domain
A	IPR042178	Serpin superfamily, domain 1	Homologous Superfamily
A	IPR042185	Serpin superfamily, domain 2	Homologous Superfamily
A	IPR036186	Serpin superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
B	Pharos: P01009	alpha 1-antitrypsin deficiency vasculitis chronic obstructive pulmonary disease nodular non-suppurative panniculitis pulmonary fibrosis cirrhosis of liver liver disease asbestosis bronchiectasis cholestasis pulmonary emphysema tubular adenocarcinoma Hemorrhage adenocarcinoma arteriosclerosis disorder alpha 1-antitrypsin deficiency vasculitis chronic obstructive pulmonary disease nodular non-suppurative panniculitis pulmonary fibrosis cirrhosis of liver liver disease asbestosis bronchiectasis cholestasis pulmonary emphysema tubular adenocarcinoma Hemorrhage adenocarcinoma arteriosclerosis disorder lung disease granular cell carcinoma hepatocellular carcinoma HIV infectious disease bipolar disorder hypoglycemia B-cell chronic lymphocytic leukemia breast carcinoma gastric cancer MALT lymphoma glioblastoma medulloblastoma head and neck cancer acute kidney failure nephrosclerosis cribriform carcinoma idiopathic interstitial pneumonia ovarian cancer cutaneous lupus erythematosus invasive ductal breast carcinoma protein-losing enteropathy lung benign neoplasm endogenous depression autism spectrum disorder malignant ependymoma Barrett esophagus ulcerative colitis FRAXE intellectual disability breast fibroadenoma gastric carcinoma cerebrovascular disorder heart disease neurodegenerative disease non-small cell lung carcinoma cribriform carcinoma of breast inborn errors of metabolism alcoholic liver cirrhosis cystic fibrosis anxiety disorder periodontitis psoriasis lung cancer esophageal adenocarcinoma autoimmune disease tuberculosis Finnish type amyloidosis malignant glioma gallbladder disease malignant pancreatic neoplasm gastric neoplasm hemochromatosis type 1 hereditary diffuse gastric adenocarcinoma COPD, severe early onset osteosarcoma Crohn disease interstitial cystitis pancreatic ductal adenocarcinoma large cell medulloblastoma pilocytic astrocytoma digestive system neuroendocrine neoplasm Ehlers-Danlos syndrome lung carcinoma atypical teratoid rhabdoid tumor
A	Pharos: P01009	alpha 1-antitrypsin deficiency vasculitis chronic obstructive pulmonary disease nodular non-suppurative panniculitis pulmonary fibrosis cirrhosis of liver liver disease asbestosis bronchiectasis cholestasis pulmonary emphysema tubular adenocarcinoma Hemorrhage adenocarcinoma arteriosclerosis disorder alpha 1-antitrypsin deficiency vasculitis chronic obstructive pulmonary disease nodular non-suppurative panniculitis pulmonary fibrosis cirrhosis of liver liver disease asbestosis bronchiectasis cholestasis pulmonary emphysema tubular adenocarcinoma Hemorrhage adenocarcinoma arteriosclerosis disorder lung disease granular cell carcinoma hepatocellular carcinoma HIV infectious disease bipolar disorder hypoglycemia B-cell chronic lymphocytic leukemia breast carcinoma gastric cancer MALT lymphoma glioblastoma medulloblastoma head and neck cancer acute kidney failure nephrosclerosis cribriform carcinoma idiopathic interstitial pneumonia ovarian cancer cutaneous lupus erythematosus invasive ductal breast carcinoma protein-losing enteropathy lung benign neoplasm endogenous depression autism spectrum disorder malignant ependymoma Barrett esophagus ulcerative colitis FRAXE intellectual disability breast fibroadenoma gastric carcinoma cerebrovascular disorder heart disease neurodegenerative disease non-small cell lung carcinoma cribriform carcinoma of breast inborn errors of metabolism alcoholic liver cirrhosis cystic fibrosis anxiety disorder periodontitis psoriasis lung cancer esophageal adenocarcinoma autoimmune disease tuberculosis Finnish type amyloidosis malignant glioma gallbladder disease malignant pancreatic neoplasm gastric neoplasm hemochromatosis type 1 hereditary diffuse gastric adenocarcinoma COPD, severe early onset osteosarcoma Crohn disease interstitial cystitis pancreatic ductal adenocarcinoma large cell medulloblastoma pilocytic astrocytoma digestive system neuroendocrine neoplasm Ehlers-Danlos syndrome lung carcinoma atypical teratoid rhabdoid tumor

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.