Annotations: 1I4Y

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1i4ya_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)
B	d1i4yb_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)
C	d1i4yc_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)
D	d1i4yd_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)
E	d1i4ye_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)
F	d1i4yf_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)
G	d1i4yg_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)
H	d1i4yh_	All alpha proteins	Four-helical up-and-down bundle	Hemerythrin-like	Hemerythrin-like	Hemerythrin	(Phascolopsis gouldii ) [TaxId: 6442 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Hemerythrin-like	8018744	4000819	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Hemerythrin-like	8018745	3001568	SCOP2 (2022-06-29)
B	SCOP2B Superfamily	Hemerythrin-like	8018745	3001568	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Hemerythrin-like	8018745	3001568	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Hemerythrin-like	8018745	3001568	SCOP2B (2022-06-29)
E	SCOP2B Superfamily	Hemerythrin-like	8018745	3001568	SCOP2B (2022-06-29)
F	SCOP2B Superfamily	Hemerythrin-like	8018745	3001568	SCOP2B (2022-06-29)
G	SCOP2B Superfamily	Hemerythrin-like	8018745	3001568	SCOP2B (2022-06-29)
H	SCOP2B Superfamily	Hemerythrin-like	8018745	3001568	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	Hemerythrin_1	e1i4yA1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)
B	Hemerythrin_1	e1i4yB1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)
C	Hemerythrin_1	e1i4yC1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)
D	Hemerythrin_1	e1i4yD1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)
E	Hemerythrin_1	e1i4yE1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)
F	Hemerythrin_1	e1i4yF1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)
G	Hemerythrin_1	e1i4yG1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)
H	Hemerythrin_1	e1i4yH1	A: alpha bundles	X: Four-helical up-and-down bundle	H: Hemerythrin (From Topology)	T: Hemerythrin	F: Hemerythrin_1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)
B	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)
C	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)
D	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)
E	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)
F	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)
G	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)
H	1.20.120.50	Mainly Alpha	Up-down Bundle	Four Helix Bundle (Hemerythrin (Met), subunit A)	Hemerythrin-like	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D, E A, B, C, D, E, F, G, H	PF01814	Hemerythrin HHE cation binding domain (Hemerythrin)	Hemerythrin HHE cation binding domain	Iteration of the HHE family ([2]) found it to be related to Hemerythrin. It also demonstrated that what has been described as a single domain ([1]) in fact consists of two cation binding domains. Members of this family occur all across nature and are ...	Iteration of the HHE family ([2]) found it to be related to Hemerythrin. It also demonstrated that what has been described as a single domain ([1]) in fact consists of two cation binding domains. Members of this family occur all across nature and are involved in a variety of processes. For instance, in Nereis diversicolor Swiss:P80255 binds Cadmium so as to protect the organism from toxicity ([3]). However Hemerythrin is classically described as Oxygen-binding through two attached Fe2+ ions. And the bacterial Swiss:Q7WX96 is a regulator of response to NO, which suggests yet another set-up for its metal ligands ([4]). In Staphylococcus aureus P72360 has been noted to be important when the organism switches to living in environments with low oxygen concentrations ([4]); perhaps this protein acts as an oxygen store or scavenger. This domain can bind oxygen (Matilla et.al., FEMS Microbiology Reviews, fuab043, 45, 2021, 1. https://doi.org/10.1093/femsre/fuab043)	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D, E A, B, C, D, E, F, G, H	METHEMERYTHRIN	oxygen carrier activity molecular carrier activity cation binding transition metal ion binding iron ion binding ion binding binding metal ion binding small molecule binding	inorganic ion homeostasis chemical homeostasis homeostatic process	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D, E A, B, C, D, E, F, G, H	IPR002063	Haemerythrin	Family
A, B, C, D, E A, B, C, D, E, F, G, H	IPR016131	Haemerythrin, iron-binding site	Binding Site
A, B, C, D, E A, B, C, D, E, F, G, H	IPR012312	Hemerythrin-like	Domain
A, B, C, D, E A, B, C, D, E, F, G, H	IPR035938	Hemerythrin-like superfamily	Homologous Superfamily
A, B, C, D, E A, B, C, D, E, F, G, H	IPR050669	Hemerythrin	Family
A, B, C, D, E A, B, C, D, E, F, G, H	IPR012827	Hemerythrin, metal-binding domain	Domain

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.