4IU9

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A [auth B]	F_UNCLASSIFIED	e4iu9B6	A: alpha complex topology	X: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	H: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	T: Major facilitator superfamily (MFS) general substrate transporter	F: F_UNCLASSIFIED	ECOD (1.6)
A [auth B]	PF07690	e4iu9B5	A: alpha complex topology	X: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	H: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	T: Major facilitator superfamily (MFS) general substrate transporter	F: PF07690	ECOD (1.6)
B [auth A]	F_UNCLASSIFIED	e4iu9A4	A: alpha complex topology	X: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	H: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	T: Major facilitator superfamily (MFS) general substrate transporter	F: F_UNCLASSIFIED	ECOD (1.6)
B [auth A]	PF07690	e4iu9A3	A: alpha complex topology	X: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	H: Major facilitator superfamily (MFS) general substrate transporter (From Topology)	T: Major facilitator superfamily (MFS) general substrate transporter	F: PF07690	ECOD (1.6)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A [auth B]	1.20.1250.20	Mainly Alpha	Up-down Bundle	Growth Hormone	Chain: A	CATH (4.3.0)
B [auth A]	1.20.1250.20	Mainly Alpha	Up-down Bundle	Growth Hormone	Chain: A	CATH (4.3.0)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B], B [auth A]	Nitrite extrusion protein 2	inorganic molecular entity transmembrane transporter activity transporter activity transmembrane transporter activity inorganic anion transmembrane transporter activity nitrite transmembrane transporter activity nitrate transmembrane transporter activity	nitrate assimilation oxoacid metabolic process cellular metabolic process organic acid metabolic process reactive nitrogen species metabolic process nitrogen cycle metabolic process organic substance metabolic process metabolic process small molecule metabolic process cellular process nitrate metabolic process	cell periphery plasma membrane membrane cellular anatomical entity

Chains	Accession	Name	Type
A [auth B], B [auth A]	IPR044772	Nitrate transporter	Family
A [auth B], B [auth A]	IPR004737	Nitrate transporter NarK/NarU-like	Family
A [auth B], B [auth A]	IPR011701	Major facilitator superfamily	Family
A [auth B], B [auth A]	IPR036259	MFS transporter superfamily	Homologous Superfamily