Annotations: 5HU6

Structure of the T. brucei haptoglobin-haemoglobin receptor bound to human haptolgobin-haemoglobin

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

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d5hu6b_	All alpha proteins	Globin-like	Globin-like	Globins	Hemoglobin, beta-chain	Human (Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
A	d5hu6a_	All alpha proteins	Globin-like	Globin-like	Globins	Hemoglobin, alpha-chain	Human (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)
B	SCOP2B Superfamily	Globin-like	8039838	3000554	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Globin-like	8039836	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)
D	HHH	e5hu6D1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: HHH	ECOD (v295.2)
C	HHH	e5hu6C1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: HHH	ECOD (v295.2)
B	HHH	e5hu6B1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: HHH	ECOD (v295.2)
A	HHH	e5hu6A1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: HHH	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D	1.20.1260.80	Mainly Alpha	Up-down Bundle	Ferritin		CATH (4.3.0)
B	1.10.490.10	Mainly Alpha	Orthogonal Bundle	Globin-like	Globins	CATH (4.3.0)
A	1.10.490.10	Mainly Alpha	Orthogonal Bundle	Globin-like	Globins	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
D	PF20933	Haptoglobin-hemoglobin receptor (HpHbR)	Haptoglobin-hemoglobin receptor	Haptoglobin-hemoglobin receptor (HpHbR), a protein found within the variant surface glycoprotein (VSG) from trypanosomes, plays a key role in determining if humans can be infected by these parasites developing sleeping sickness. HpHbR is responsible ...	Haptoglobin-hemoglobin receptor (HpHbR), a protein found within the variant surface glycoprotein (VSG) from trypanosomes, plays a key role in determining if humans can be infected by these parasites developing sleeping sickness. HpHbR is responsible for the acquisition of haem, an important growth factor for these organism that are deficient in its biosynthesis. This protein folds into an elongated three alpha-helical bundle with a small head structure containing the ligand-binding site that is distal to the C-terminal GPI-anchor attachment site. This structure appears to be conserved among trypanosome species [1-4].	Domain
B	PF00042	Globin (Globin)	Globin		Domain
A	PF00042	Globin (Globin)	Globin		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D	Haptoglobin-hemoglobin receptor	heme transmembrane transporter activity transporter activity transmembrane transporter activity	response to oxidative stress response to stimulus response to stress localization import into cell transport cellular process receptor-mediated endocytosis endocytosis establishment of localization vesicle-mediated transport	cellular anatomical structure intracellular anatomical structure cytoplasm ciliary pocket membrane-bounded organelle cell projection organelle cilium plasma membrane bounded cell projection
C	Haptoglobin	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	negative regulation of catabolic process regulation of biological process catabolic process regulation of cellular process negative regulation of metabolic process biological regulation reactive oxygen species metabolic process hydrogen peroxide metabolic process negative regulation of biological process regulation of catabolic process regulation of hydrogen peroxide catabolic process negative regulation of reactive oxygen species metabolic process negative regulation of hydrogen peroxide metabolic process regulation of hydrogen peroxide metabolic process negative regulation of cellular process negative regulation of catabolic process regulation of biological process catabolic process regulation of cellular process negative regulation of metabolic process biological regulation reactive oxygen species metabolic process hydrogen peroxide metabolic process negative regulation of biological process regulation of catabolic process regulation of hydrogen peroxide catabolic process negative regulation of reactive oxygen species metabolic process negative regulation of hydrogen peroxide metabolic process regulation of hydrogen peroxide metabolic process negative regulation of cellular process metabolic process cellular process hydrogen peroxide catabolic process negative regulation of hydrogen peroxide catabolic process regulation of metabolic process regulation of reactive oxygen species metabolic process response to stimulus defense response response to stress inflammatory response response to hydrogen peroxide response to oxidative stress response to chemical response to oxygen-containing compound response to reactive oxygen species zymogen activation primary metabolic process gene expression macromolecule biosynthetic process protein maturation biosynthetic process proteolysis protein processing protein metabolic process macromolecule metabolic process	protein-containing complex haptoglobin-hemoglobin complex cellular anatomical structure extracellular region 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 protein-containing complex haptoglobin-hemoglobin complex cellular anatomical structure extracellular region 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
B	Hemoglobin subunit beta	hemoglobin binding protein binding binding oxygen binding small molecule binding hemoglobin alpha binding oxygen carrier activity molecular carrier activity tetrapyrrole binding heme binding	regulation of biosynthetic process regulation of nitric oxide biosynthetic process regulation of biological process regulation of cellular process biological regulation positive regulation of biological process reactive nitrogen species metabolic process nitric oxide metabolic process positive regulation of metabolic process nitric oxide biosynthetic process biosynthetic process positive regulation of biosynthetic process cellular process metabolic process regulation of biosynthetic process regulation of nitric oxide biosynthetic process regulation of biological process regulation of cellular process biological regulation positive regulation of biological process reactive nitrogen species metabolic process nitric oxide metabolic process positive regulation of metabolic process nitric oxide biosynthetic process biosynthetic process positive regulation of biosynthetic process cellular process metabolic process regulation of nitric oxide metabolic process positive regulation of nitric oxide biosynthetic process regulation of metabolic process positive regulation of cellular process catabolic process hydrogen peroxide metabolic process reactive oxygen species metabolic process hydrogen peroxide catabolic process developmental process multicellular organismal process erythrocyte development cellular developmental process homeostatic process hemopoiesis cell development erythrocyte differentiation multicellular organismal-level homeostasis myeloid cell differentiation immune system process cell differentiation anatomical structure development myeloid cell development homeostasis of number of cells myeloid cell homeostasis erythrocyte homeostasis 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 regulation of biological quality response to wounding platelet activation oxygen transport localization transport gas transport establishment of localization one-carbon compound transport carbon dioxide transport renal system process system process renal absorption nitric oxide transport nitrogen compound transport defense response inflammatory response response to hydrogen peroxide response to oxidative stress response to chemical response to oxygen-containing compound response to reactive oxygen species 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 cellular anatomical structure intracellular anatomical structure hemoglobin complex cytoplasm cytosol haptoglobin-hemoglobin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle vesicle protein-containing complex cellular anatomical structure intracellular anatomical structure hemoglobin complex cytoplasm cytosol haptoglobin-hemoglobin complex extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle 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
A	Hemoglobin subunit alpha	oxygen binding binding small molecule binding oxygen carrier activity molecular carrier activity tetrapyrrole binding heme binding cation binding transition metal ion binding iron ion binding ion binding metal ion binding	catabolic process hydrogen peroxide metabolic process reactive oxygen species metabolic process metabolic process cellular process hydrogen peroxide catabolic process developmental process multicellular organismal process erythrocyte development cellular developmental process homeostatic process hemopoiesis cell development erythrocyte differentiation catabolic process hydrogen peroxide metabolic process reactive oxygen species metabolic process metabolic process cellular process hydrogen peroxide catabolic process developmental process multicellular organismal process erythrocyte development cellular developmental process homeostatic process hemopoiesis cell development erythrocyte differentiation multicellular organismal-level homeostasis myeloid cell differentiation immune system process cell differentiation anatomical structure development myeloid cell development homeostasis of number of cells myeloid cell homeostasis erythrocyte homeostasis oxygen transport localization transport gas transport establishment of localization one-carbon compound transport carbon dioxide transport nitric oxide transport nitrogen compound transport response to stimulus defense response response to stress inflammatory response response to hydrogen peroxide response to oxidative stress response to chemical response to oxygen-containing compound response to reactive oxygen species 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 cellular anatomical structure intracellular anatomical structure hemoglobin complex cytoplasm cytosol haptoglobin-hemoglobin complex membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle protein-containing complex cellular anatomical structure intracellular anatomical structure hemoglobin complex cytoplasm cytosol haptoglobin-hemoglobin complex membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle 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

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
D	IPR049462	Haptoglobin-hemoglobin receptor	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	IPR035976	Sushi/SCR/CCP superfamily	Homologous Superfamily
B	IPR009050	Globin-like superfamily	Homologous Superfamily
B	IPR012292	Globin/Protoglobin	Homologous Superfamily
B	IPR000971	Globin	Domain
B	IPR050056	Hemoglobin and related oxygen transporters	Family
B	IPR002337	Hemoglobin, beta-type	Family
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
A	IPR050056	Hemoglobin and related oxygen transporters	Family