Annotations: 6Z16

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C	PF00420	e6z16C1	A: alpha complex topology	X: NADH-quinone oxidoreductase subunit K (From Topology)	H: NADH-quinone oxidoreductase subunit K (From Topology)	T: NADH-quinone oxidoreductase subunit K	F: PF00420	ECOD (1.6)
J [auth c]	PF00420	e6z16c1	A: alpha complex topology	X: NADH-quinone oxidoreductase subunit K (From Topology)	H: NADH-quinone oxidoreductase subunit K (From Topology)	T: NADH-quinone oxidoreductase subunit K	F: PF00420	ECOD (1.6)
D	PF00361	e6z16D1	A: alpha complex topology	X: Sodium/proton antiporter subunits-like (From Homology)	H: Sodium/proton antiporter subunits-like	T: NADH-quinone oxidoreductase subunit L (NuoL)-related	F: PF00361	ECOD (1.6)
K [auth d]	PF00361	e6z16d1	A: alpha complex topology	X: Sodium/proton antiporter subunits-like (From Homology)	H: Sodium/proton antiporter subunits-like	T: NADH-quinone oxidoreductase subunit L (NuoL)-related	F: PF00361	ECOD (1.6)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, H [auth a]	PF00361	Proton-conducting membrane transporter (Proton_antipo_M)	Proton-conducting membrane transporter	-	Family
A, H [auth a]	PF13244	MBH, subunit D (MbhD)	MBH, subunit D	Hydrogen gas-evolving membrane-bound hydrogenase (MBH) is a respiratory complex homologous to the quinone-reducing Complex I. Like Complex I, MBH has peripheral and membrane arms. MBH is made of 14 subunits (MbhA-N). MbhJ, K, L, N and M form the Mem ...	Hydrogen gas-evolving membrane-bound hydrogenase (MBH) is a respiratory complex homologous to the quinone-reducing Complex I. Like Complex I, MBH has peripheral and membrane arms. MBH is made of 14 subunits (MbhA-N). MbhJ, K, L, N and M form the Membrane-anchored hydrogenase module. MbhJ, K, L, N are predicted to be exposed to the cytoplasm and form the peripheral arm. The remaining 10 subunits are predicted to be integral membrane proteins forming the membrane arm, made of 44 transmembrane helices (TMH) [2, 3]. MbhA, B, C and F form the Sodium translocation module. MbhD, E, G and H form the Proton translocation module. MbhI is the linker between the hydrogenase module and the proton-translocating membrane module. It anchors the discontinuous TMH7 of MbhH via its middle lateral helix and the C-terminal of TMH2, found in MbhE. MbhD and MbhE together are equivalent to Nqo10 of Complex I [1]. MbhD has three TM helices.	Domain
A, H [auth a]	PF00662	NADH-Ubiquinone oxidoreductase (complex I), chain 5 N-terminus (Proton_antipo_N)	NADH-Ubiquinone oxidoreductase (complex I), chain 5 N-terminus	-	Family
A, H [auth a]	PF20501	MBH, subunit E (MbhE)	MBH, subunit E	Hydrogen gas-evolving membrane-bound hydrogenase (MBH) is a respiratory complex homologous to the quinone-reducing Complex I. Like Complex I, MBH has peripheral and membrane arms. MBH is made of 14 subunits (MbhA-N). MbhJ, K, L, N and M form the Mem ...	Hydrogen gas-evolving membrane-bound hydrogenase (MBH) is a respiratory complex homologous to the quinone-reducing Complex I. Like Complex I, MBH has peripheral and membrane arms. MBH is made of 14 subunits (MbhA-N). MbhJ, K, L, N and M form the Membrane-anchored hydrogenase module. MbhJ, K, L, N are predicted to be exposed to the cytoplasm and form the peripheral arm. The remaining 10 subunits are predicted to be integral membrane proteins forming the membrane arm, made of 44 transmembrane helices (TMH) [2, 3]. MbhA, B, C and F form the Sodium translocation module. MbhD, E, G and H form the Proton translocation module. MbhI is the linker between the hydrogenase module and the proton-translocating membrane module. It anchors the discontinuous TMH7 of MbhH via its middle lateral helix and the C-terminal of TMH2, found in MbhE. MbhD and MbhE together are equivalent to Nqo10 of Complex I [1]. MbhE has two transmembrane helices: TMH1 and TMH2.	Domain
B, I [auth b]	PF04039	Domain related to MnhB subunit of Na+/H+ antiporter (MnhB)	Domain related to MnhB subunit of Na+/H+ antiporter	-	Family
C, J [auth c]	PF00420	NADH-ubiquinone/plastoquinone oxidoreductase chain 4L (Oxidored_q2)	NADH-ubiquinone/plastoquinone oxidoreductase chain 4L	-	Family
D, K [auth d]	PF00361	Proton-conducting membrane transporter (Proton_antipo_M)	Proton-conducting membrane transporter	-	Family
E, L [auth e]	PF01899	Na+/H+ ion antiporter subunit (MNHE)	Na+/H+ ion antiporter subunit	-	Family
F, M [auth f]	PF04066	Multiple resistance and pH regulation protein F (MrpF / PhaF) (MrpF_PhaF)	Multiple resistance and pH regulation protein F (MrpF / PhaF)	-	Family
G, N [auth g]	PF03334	Na+/H+ antiporter subunit (PhaG_MnhG_YufB)	Na+/H+ antiporter subunit	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, H [auth a]	Multisubunit Na+/H+ antiporter, A subunit	antiporter activity active transmembrane transporter activity transporter activity transmembrane transporter activity secondary active transmembrane transporter activity	transport proton transmembrane transport monoatomic ion transmembrane transport inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport transmembrane transport monoatomic cation transmembrane transport localization monoatomic ion transport cellular process monoatomic cation transport sodium ion transport metal ion transport	cell periphery plasma membrane membrane cellular anatomical entity
B, I [auth b]	Multisubunit Na+/H+ antiporter, B subunit	antiporter activity active transmembrane transporter activity transporter activity transmembrane transporter activity secondary active transmembrane transporter activity	-	cell periphery plasma membrane membrane cellular anatomical entity
C, J [auth c]	Multisubunit Na+/H+ antiporter, C subunit	-	-	cell periphery plasma membrane membrane cellular anatomical entity
D, K [auth d]	Multisubunit Na+/H+ antiporter, D subunit	antiporter activity active transmembrane transporter activity transporter activity transmembrane transporter activity secondary active transmembrane transporter activity electron transfer activity NADH dehydrogenase (ubiquinone) activity oxidoreduction-driven active transmembrane transporter activity primary active transmembrane transporter activity	aerobic respiration cellular respiration oxidative phosphorylation energy derivation by oxidation of organic compounds cellular metabolic process ATP synthesis coupled electron transport electron transport chain generation of precursor metabolites and energy respiratory electron transport chain metabolic process cellular process	membrane cellular anatomical entity
E, L [auth e]	Multisubunit Na+/H+ antiporter, E subunit	monoatomic cation transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity	-	cell periphery plasma membrane membrane cellular anatomical entity
F, M [auth f]	Multisubunit Na+/H+ antiporter, F subunit	monoatomic ion transmembrane transporter activity transporter activity transmembrane transporter activity antiporter activity active transmembrane transporter activity secondary active transmembrane transporter activity	-	cell periphery plasma membrane membrane cellular anatomical entity
G, N [auth g]	Multisubunit Na+/H+ antiporter, G subunit	antiporter activity active transmembrane transporter activity transporter activity transmembrane transporter activity secondary active transmembrane transporter activity	transmembrane transport localization transport cellular process inorganic ion transmembrane transport establishment of localization inorganic cation transmembrane transport	membrane cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, H [auth a]	IPR025383	MrpA C-terminal/MbhD	Domain
A, H [auth a]	IPR046806	MrpA C-terminal/MbhE	Domain
A, H [auth a]	IPR001516	NADH-Ubiquinone oxidoreductase (complex I), chain 5 N-terminal	Domain
A, H [auth a]	IPR001750	NADH:quinone oxidoreductase/Mrp antiporter, membrane subunit	Domain
A, H [auth a]	IPR005663	Monovalent cation proton antiporter subunit A	Family
B, I [auth b]	IPR007182	Na+/H+ antiporter MnhB subunit-related protein	Domain
C, J [auth c]	IPR039428	NADH-ubiquinone oxidoreductase chain 4L/Mnh complex subunit C1-like	Family
D, K [auth d]	IPR003918	NADH:ubiquinone oxidoreductase	Family
D, K [auth d]	IPR001750	NADH:quinone oxidoreductase/Mrp antiporter, membrane subunit	Domain
E, L [auth e]	IPR002758	Na+/H+ antiporter subunit E	Family
F, M [auth f]	IPR007208	Na(+)/H(+) antiporter subunit F-like	Family
G, N [auth g]	IPR005133	Na+/H+ antiporter subunit G	Family

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A, B, C, D, E A, B, C, D, E, F, G, H [auth a], I [auth b], J [auth c], K [auth d], L [auth e], M [auth f], N [auth g]	OPM	Transmembrane	Alpha-helical polytopic	Electron transport chain complex I (NADH dehydrogenase) and supercomplexes	H+ or Na+ translocating NADH dehydrogenase

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, B, C, D, E A, B, C, D, E, F, G, H [auth a], I [auth b], J [auth c], K [auth d], L [auth e], M [auth f], N [auth g]	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B, C, D, E A, B, C, D, E, F, G, H [auth a], I [auth b], J [auth c], K [auth d], L [auth e], M [auth f], N [auth g]	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B, C, D, E A, B, C, D, E, F, G, H [auth a], I [auth b], J [auth c], K [auth d], L [auth e], M [auth f], N [auth g]	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Electron Transport Chain Complexes: Complex I	Mrp ancient cation/proton antiporter complex

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 R01GM133198.