6TB2

Structure of human haptoglobin-hemoglobin bound to S. aureus IsdH

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	d6tb2a_	All alpha proteins	Globin-like	Globin-like	Globins	Hemoglobin, alpha-chain	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B	d6tb2b_	All alpha proteins	Globin-like	Globin-like	Globins	Hemoglobin, beta-chain	(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	SCOP2B Superfamily	Globin-like	8039836	3000554	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Globin-like	8039838	3000554	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)
A	PF00042	e6tb2A1	A: alpha arrays	X: Globin-like (From Topology)	H: Globin-like (From Topology)	T: Globin-like	F: PF00042	ECOD (1.6)
D	PF05031	e6tb2D1	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PF05031	ECOD (1.6)
D	PF20861	e6tb2D2	A: alpha arrays	X: Iron-regulated surface determinant protein H linker domain (From Topology)	H: Iron-regulated surface determinant protein H linker domain (From Topology)	T: Iron-regulated surface determinant protein H linker domain	F: PF20861	ECOD (1.6)
E	PF05031	e6tb2E3	A: beta sandwiches	X: Immunoglobulin-like beta-sandwich	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: PF05031	ECOD (1.6)
E	PF20861	e6tb2E1	A: alpha arrays	X: Iron-regulated surface determinant protein H linker domain (From Topology)	H: Iron-regulated surface determinant protein H linker domain (From Topology)	T: Iron-regulated surface determinant protein H linker domain	F: PF20861	ECOD (1.6)
B	PF00042	e6tb2B1	A: alpha arrays	X: Globin-like (From Topology)	H: Globin-like (From Topology)	T: Globin-like	F: PF00042	ECOD (1.6)
C	PF00089	e6tb2C1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: FMN-binding split barrel 2	F: PF00089	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.490.10	Mainly Alpha	Orthogonal Bundle	Globin-like	Globins	CATH (utative)
B	1.10.490.10	Mainly Alpha	Orthogonal Bundle	Globin-like	Globins	CATH (utative)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00042	Globin (Globin)	Globin	-	Domain
D, E	PF05031	Iron Transport-associated domain (NEAT)	Iron Transport-associated domain	NEAT domains are heme and/or hemoprotein-binding modules highly conserved in secondary structure [1]. They have roles in hemoprotein binding, heme extraction and heme transfer [2]	Domain
D, E	PF20861	Iron-regulated surface determinant protein H/B, linker domain (Isd_H_B_linker)	Iron-regulated surface determinant protein H/B, linker domain	The bacterial pathogen Staphylococcus aureus uses two closely related receptors located on its surface, IsdH and IsdB, to capture from haemoglobin (Hb) the iron it needs to grow. Both proteins show conserved near iron transporter (NEAT) domains (Pfam ...	The bacterial pathogen Staphylococcus aureus uses two closely related receptors located on its surface, IsdH and IsdB, to capture from haemoglobin (Hb) the iron it needs to grow. Both proteins show conserved near iron transporter (NEAT) domains (Pfam:PF05031) that function synergistically. These domains, essential for the arrest of iron, are appropriately positioned by an alpha-helical linker domain (this entry), which does not interact itself with the heme group. In IsdH, this linker domain forms a three-helix bundle structure that is essential for efficient heme capture [1-4].	Domain
B	PF00042	Globin (Globin)	Globin	-	Domain
C	PF00089	Trypsin (Trypsin)	Trypsin	-	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Hemoglobin subunit alpha	oxygen binding binding small molecule binding oxygen carrier activity molecular carrier activity organic cyclic compound binding tetrapyrrole binding heme binding cation binding transition metal ion binding iron ion binding ion binding metal ion binding organic acid binding	cellular catabolic process catabolic process cellular metabolic process hydrogen peroxide metabolic process reactive oxygen species metabolic process metabolic process cellular process hydrogen peroxide catabolic process oxygen transport localization transport gas transport establishment of localization one-carbon compound transport cellular catabolic process catabolic process cellular metabolic process hydrogen peroxide metabolic process reactive oxygen species metabolic process metabolic process cellular process hydrogen peroxide catabolic process oxygen transport localization transport gas transport establishment of localization one-carbon compound transport organic substance transport carbon dioxide transport nitric oxide transport nitrogen compound transport response to hydrogen peroxide response to oxidative stress response to stimulus response to stress response to chemical response to oxygen-containing compound response to reactive oxygen species response to inorganic substance cellular response to stimulus cellular detoxification cellular response to chemical stimulus detoxification cellular oxidant detoxification cellular response to toxic substance response to toxic substance	protein-containing complex intracellular anatomical structure hemoglobin complex cytoplasm cellular anatomical entity cytosol haptoglobin-hemoglobin complex membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle protein-containing complex intracellular anatomical structure hemoglobin complex cytoplasm cellular anatomical entity cytosol haptoglobin-hemoglobin complex membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle blood microparticle intracellular vesicle membrane-enclosed lumen intracellular membrane-bounded organelle intracellular organelle lumen intracellular organelle cytoplasmic vesicle organelle lumen endocytic vesicle lumen endocytic vesicle
D, E	Cell wall surface anchor family protein	binding organic cyclic compound binding tetrapyrrole binding heme binding	-	extracellular region cellular anatomical entity
B	Hemoglobin subunit beta	hemoglobin binding protein binding binding oxygen binding small molecule binding hemoglobin alpha binding oxygen carrier activity molecular carrier activity organic cyclic compound binding tetrapyrrole binding heme binding organic acid binding cation binding ion binding hemoglobin binding protein binding binding oxygen binding small molecule binding hemoglobin alpha binding oxygen carrier activity molecular carrier activity organic cyclic compound binding tetrapyrrole binding heme binding organic acid binding cation binding ion binding metal ion binding	regulation of biosynthetic process regulation of nitric oxide biosynthetic process regulation of biological process biological regulation positive regulation of biological process reactive nitrogen species metabolic process positive regulation of nitric oxide metabolic process nitric oxide metabolic process positive regulation of metabolic process nitric oxide biosynthetic process biosynthetic process positive regulation of biosynthetic process metabolic process regulation of nitric oxide metabolic process regulation of biosynthetic process regulation of nitric oxide biosynthetic process regulation of biological process biological regulation positive regulation of biological process reactive nitrogen species metabolic process positive regulation of nitric oxide metabolic process nitric oxide metabolic process positive regulation of metabolic process nitric oxide biosynthetic process biosynthetic process positive regulation of biosynthetic process metabolic process regulation of nitric oxide metabolic process positive regulation of nitric oxide biosynthetic process regulation of metabolic process cellular catabolic process catabolic process cellular metabolic process hydrogen peroxide metabolic process reactive oxygen species metabolic process cellular process hydrogen peroxide catabolic process multicellular organismal process system process circulatory system process regulation of blood pressure regulation of biological quality blood circulation regulation of body fluid levels wound healing response to stimulus homotypic cell-cell adhesion cell activation hemostasis platelet aggregation blood coagulation cell adhesion cell-cell adhesion response to stress coagulation response to wounding platelet activation oxygen transport localization transport gas transport establishment of localization one-carbon compound transport organic substance transport carbon dioxide transport renal system process renal absorption nitric oxide transport nitrogen compound transport regulation of tube diameter regulation of tube size vascular process in circulatory system blood vessel diameter maintenance regulation of anatomical structure size response to hydrogen peroxide response to oxidative stress response to chemical response to oxygen-containing compound response to reactive oxygen species response to inorganic substance cellular response to stimulus cellular detoxification cellular response to chemical stimulus detoxification cellular oxidant detoxification cellular response to toxic substance response to toxic substance	protein-containing complex intracellular anatomical structure hemoglobin complex cytoplasm cellular anatomical entity cytosol haptoglobin-hemoglobin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space protein-containing complex intracellular anatomical structure hemoglobin complex cytoplasm cellular anatomical entity cytosol haptoglobin-hemoglobin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle extracellular space vesicle extracellular membrane-bounded organelle membrane-enclosed lumen intracellular vesicle ficolin-1-rich granule intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen intracellular organelle organelle lumen cytoplasmic vesicle ficolin-1-rich granule lumen secretory granule secretory vesicle blood microparticle tertiary granule lumen tertiary granule endocytic vesicle lumen endocytic vesicle
C	Haptoglobin	antioxidant activity hemoglobin binding protein binding binding 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	immune system process acute-phase response response to stimulus defense response response to stress inflammatory response acute inflammatory response negative regulation of cellular catabolic process catabolic process regulation of cellular process reactive oxygen species metabolic process negative regulation of biological process regulation of hydrogen peroxide catabolic process negative regulation of cellular metabolic process immune system process acute-phase response response to stimulus defense response response to stress inflammatory response acute inflammatory response negative regulation of cellular catabolic process catabolic process regulation of cellular process reactive oxygen species metabolic process negative regulation of biological process regulation of hydrogen peroxide catabolic process negative regulation of cellular metabolic process cellular catabolic process negative regulation of reactive oxygen species metabolic process regulation of hydrogen peroxide metabolic process negative regulation of cellular process negative regulation of hydrogen peroxide catabolic process negative regulation of catabolic process regulation of biological process cellular metabolic process negative regulation of metabolic process biological regulation hydrogen peroxide metabolic process regulation of cellular metabolic process regulation of catabolic process negative regulation of hydrogen peroxide metabolic process regulation of cellular catabolic process metabolic process cellular process hydrogen peroxide catabolic process regulation of metabolic process regulation of reactive oxygen species metabolic process regulation of molecular function regulation of catalytic activity negative regulation of oxidoreductase activity negative regulation of molecular function negative regulation of catalytic activity regulation of oxidoreductase activity response to hydrogen peroxide response to oxidative stress response to chemical response to oxygen-containing compound response to reactive oxygen species response to inorganic substance biological process involved in interspecies interaction between organisms response to other organism response to external stimulus response to biotic stimulus defense response to bacterium defense response to other organism response to bacterium response to external biotic stimulus	protein-containing complex haptoglobin-hemoglobin complex extracellular region extracellular space cellular anatomical entity blood microparticle membrane-bounded organelle intracellular anatomical structure tertiary granule lumen membrane-enclosed lumen intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen protein-containing complex haptoglobin-hemoglobin complex extracellular region extracellular space cellular anatomical entity blood microparticle membrane-bounded organelle intracellular anatomical structure tertiary granule lumen membrane-enclosed lumen intracellular vesicle intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen tertiary granule intracellular organelle organelle lumen cytoplasmic vesicle organelle secretory granule secretory vesicle cytoplasm vesicle extracellular exosome extracellular vesicle extracellular organelle extracellular membrane-bounded organelle vesicle lumen cytoplasmic vesicle lumen secretory granule lumen specific granule lumen specific granule endocytic vesicle lumen endocytic vesicle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR002338	Hemoglobin, alpha-type	Family
A	IPR002339	Hemoglobin, pi	Family
A	IPR009050	Globin-like superfamily	Homologous Superfamily
A	IPR012292	Globin/Protoglobin	Homologous Superfamily
A	IPR000971	Globin	Domain
D, E	IPR005877	YSIRK Gram-positive signal peptide	Domain
D, E	IPR006635	NEAT domain	Domain
D, E	IPR019930	Iron-regulated surface determinant protein H	Family
D, E	IPR048652	Iron-regulated surface determinant protein H/B, linker domain	Domain
D, E	IPR037250	NEAT domain superfamily	Homologous Superfamily
D, E	IPR019931	LPXTG cell wall anchor domain	Domain
B	IPR009050	Globin-like superfamily	Homologous Superfamily
B	IPR012292	Globin/Protoglobin	Homologous Superfamily
B	IPR000971	Globin	Domain
B	IPR002337	Hemoglobin, beta-type	Family
C	IPR009003	Peptidase S1, PA clan	Homologous Superfamily
C	IPR001314	Peptidase S1A, chymotrypsin family	Family
C	IPR001254	Serine proteases, trypsin domain	Domain
C	IPR000436	Sushi/SCR/CCP domain	Domain
C	IPR043504	Peptidase S1, PA clan, chymotrypsin-like fold	Homologous Superfamily
C	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P69905	alpha thalassemia Heinz body anemia acquired polycythemia vera methemoglobinemia hemoglobin H disease polycythemia familial hemolytic anemia alpha thalassemia-intellectual disability syndrome type 1 sarcomatoid carcinoma carcinoma Mammary Neoplasms, Experimental type 2 diabetes mellitus cerebral infarction hemolytic anemia inborn carbohydrate metabolic disorder alpha thalassemia Heinz body anemia acquired polycythemia vera methemoglobinemia hemoglobin H disease polycythemia familial hemolytic anemia alpha thalassemia-intellectual disability syndrome type 1 sarcomatoid carcinoma carcinoma Mammary Neoplasms, Experimental type 2 diabetes mellitus cerebral infarction hemolytic anemia inborn carbohydrate metabolic disorder mammary neoplasms, animal thalassemia congenital anemia facioscapulohumeral muscular dystrophy familial polycythemia hydrops fetalis lung adenocarcinoma beta thalassemia sickle cell anemia Hb Bart's hydrops fetalis hemoglobin M disease maturity-onset diabetes of the young breast carcinoma undifferentiated carcinoma diabetes mellitus
B	Pharos: P68871	sickle cell anemia beta thalassemia dominant beta-thalassemia Heinz body anemia polycythemia methemoglobinemia alpha thalassemia echinococcosis acquired polycythemia vera malaria hemoglobin C disease Plasmodium falciparum malaria Cyanosis hemoglobin D disease inherited hemoglobinopathy sickle cell anemia beta thalassemia dominant beta-thalassemia Heinz body anemia polycythemia methemoglobinemia alpha thalassemia echinococcosis acquired polycythemia vera malaria hemoglobin C disease Plasmodium falciparum malaria Cyanosis hemoglobin D disease inherited hemoglobinopathy congenital dyserythropoietic anemia familial hemolytic anemia hemoglobin E disease beta-thalassemia HBB/LCRB hemoglobin E-beta-thalassemia syndrome juvenile dermatomyositis lung adenocarcinoma delta-beta-thalassemia lymphoplasmacytic lymphoma malignant ependymoma MALT lymphoma gastric cancer myopathy anemia pancreatic ductal adenocarcinoma atypical teratoid rhabdoid tumor pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia hemoglobin M disease beta-thalassemia major hereditary persistence of fetal hemoglobin cerebrovascular disorder sickle cell-hemoglobin E disease syndrome large cell medulloblastoma thalassemia minor lung cancer diabetes mellitus Duchenne muscular dystrophy malignant glioma medulloblastoma acute myeloid leukemia gastric carcinoma non-small cell lung carcinoma pancreatic intraductal papillary-mucinous carcinoma B-cell chronic lymphocytic leukemia periodontitis hemolytic anemia breast cancer hereditary persistence of fetal hemoglobin-beta-thalassemia syndrome sickle cell-hemoglobin c disease syndrome invasive ductal breast carcinoma thalassemia limb-girdle muscular dystrophy tuberculosis lung carcinoma malignant colon neoplasm ductal breast carcinoma in situ malignant pancreatic neoplasm exocrine pancreatic carcinoma familial polycythemia head and neck cancer ovarian cancer atopic eczema hemoglobin C-beta-thalassemia syndrome pancreatic intraductal papillary-mucinous neoplasm beta-thalassemia intermedia hepatocellular carcinoma breast carcinoma hypophosphatemic bone disease sickle cell-hemoglobin d disease syndrome congenital anemia
C	Pharos: P00738	anemia hereditary hemochromatosis sickle cell anemia malaria tuberculosis arthritic joint disease retinal detachment breast carcinoma chronic hepatitis B virus infection type 2 diabetes mellitus diabetic peripheral angiopathy Dyslipidemias myocardial infarction anhaptoglobinemia hepatitis B virus infection anemia hereditary hemochromatosis sickle cell anemia malaria tuberculosis arthritic joint disease retinal detachment breast carcinoma chronic hepatitis B virus infection type 2 diabetes mellitus diabetic peripheral angiopathy Dyslipidemias myocardial infarction anhaptoglobinemia hepatitis B virus infection autoimmune disease leukemia allergic disease atherosclerosis schizophrenia HIV infectious disease hypertensive disorder cardiovascular disease type 1 diabetes mellitus lung adenocarcinoma major depressive disorder MALT lymphoma maturity-onset diabetes of the young acute kidney failure osteosarcoma heart disease pituitary cancer atypical teratoid rhabdoid tumor depressive disorder lung cancer female reproductive organ cancer ovarian cancer hypertension, pregnancy-induced sinusitis interstitial cystitis chronic hepatitis C virus infection lung carcinoma female reproductive system neoplasm non-small cell lung carcinoma arteriosclerosis disorder breast cancer thrombocytopenia