1	.	.	.	.	.	.	.	.	10	.	.	.	.	.	.	.	.	.	20	.	.	.	.	.	.	.	.	.	30	.	.	.	.	.	.	.	.	.	40	.	.	.	.	.	.	.	.	.	50	.	.	.	.	.	.	.	.	.	60
Sequence		M	W	S	W	V	C	H	R	I	S	G	A	T	I	F	F	F	L	F	V	H	V	L	D	A	A	M	L	R	V	S	P	Q	T	Y	N	A	V	L	A	T	Y	K	T	P	I	V	G	L	M	E	Y	G	L	V	A	A	V	L	F
Secondary structure
SS confidence
Disorder		?																												?	?
Disorder confidence
		.	.	.	.	.	.	.	.	.	70	.	.	.	.	.	.	.	.	.	80	.	.	.	.	.	.	.	.	.	90	.	.	.	.	.	.	.	.	.	100	.	.	.	.	.	.	.	.	.	110	.	.
Sequence		H	A	L	N	G	I	R	V	I	L	I	D	F	W	S	E	G	P	R	Y	Q	R	L	M	L	W	I	I	G	S	V	F	L	L	L	M	V	P	A	G	V	V	V	G	I	H	M	W	E	H	F	R
Secondary structure
SS confidence
Disorder																																																			?	?	?
Disorder confidence

Confidence Key High(9)                     Low (0)

? Disordered ( 5%) Alpha helix ( 96%) Beta strand ( 0%) TM helix ( 63%) (View membrane topology prediction)

Rank Aligned region

PDB 1nek chain C Region: 1 - 103 Aligned: 103 Modelled: 103 Confidence: 100.0% Identity: 23% Fold: Heme-binding four-helical bundle Superfamily: Fumarate reductase respiratory complex transmembrane subunits Family: Succinate dehydrogenase/Fumarate reductase transmembrane subunits (SdhC/FrdC and SdhD/FrdD) Phyre2 PDB 1yq3 chain C Region: 1 - 99 Aligned: 99 Modelled: 99 Confidence: 100.0% Identity: 21% PDB header:oxidoreductase Chain: C: PDB Molecule:succinate dehydrogenase cytochrome b, large subunit; PDBTitle: avian respiratory complex ii with oxaloacetate and ubiquinone Phyre2 PDB 3vrb chain G Region: 1 - 103 Aligned: 103 Modelled: 103 Confidence: 99.9% Identity: 18% PDB header:oxidoreductase/oxidoreductase inhibitor Chain: G: PDB Molecule:cytochrome b-large subunit; PDBTitle: mitochondrial rhodoquinol-fumarate reductase from the parasitic2 nematode ascaris suum with the specific inhibitor flutolanil and3 substrate fumarate Phyre2 PDB 1nek chain D Region: 1 - 104 Aligned: 100 Modelled: 104 Confidence: 99.7% Identity: 21% Fold: Heme-binding four-helical bundle Superfamily: Fumarate reductase respiratory complex transmembrane subunits Family: Succinate dehydrogenase/Fumarate reductase transmembrane subunits (SdhC/FrdC and SdhD/FrdD) Phyre2 PDB 2bs2 chain C domain 1 Region: 2 - 109 Aligned: 107 Modelled: 108 Confidence: 99.1% Identity: 16% Fold: Heme-binding four-helical bundle Superfamily: Fumarate reductase respiratory complex transmembrane subunits Family: Fumarate reductase respiratory complex cytochrome b subunit, FrdC Phyre2 PDB 5xmj chain G Region: 2 - 104 Aligned: 100 Modelled: 103 Confidence: 98.8% Identity: 14% PDB header:electron transport Chain: G: PDB Molecule:fumarate reductase respiratory complex; PDBTitle: crystal structure of quinol:fumarate reductase from desulfovibrio2 gigas Phyre2 PDB 1kf6 chain C Region: 4 - 104 Aligned: 101 Modelled: 101 Confidence: 97.6% Identity: 10% Fold: Heme-binding four-helical bundle Superfamily: Fumarate reductase respiratory complex transmembrane subunits Family: Succinate dehydrogenase/Fumarate reductase transmembrane subunits (SdhC/FrdC and SdhD/FrdD) Phyre2 PDB 1kf6 chain D Region: 4 - 99 Aligned: 95 Modelled: 96 Confidence: 97.5% Identity: 14% Fold: Heme-binding four-helical bundle Superfamily: Fumarate reductase respiratory complex transmembrane subunits Family: Succinate dehydrogenase/Fumarate reductase transmembrane subunits (SdhC/FrdC and SdhD/FrdD) Phyre2 PDB 3cx5 chain C domain 2 Region: 1 - 101 Aligned: 92 Modelled: 101 Confidence: 19.7% Identity: 12% Fold: Heme-binding four-helical bundle Superfamily: Transmembrane di-heme cytochromes Family: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) Phyre2 PDB 1q90 chain B Region: 9 - 101 Aligned: 93 Modelled: 93 Confidence: 15.7% Identity: 12% Fold: Heme-binding four-helical bundle Superfamily: Transmembrane di-heme cytochromes Family: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) Phyre2 PDB 5mrw chain L Region: 9 - 23 Aligned: 15 Modelled: 15 Confidence: 11.6% Identity: 27% PDB header:hydrolase Chain: L: PDB Molecule:potassium-transporting atpase kdpf subunit; PDBTitle: structure of the kdpfabc complex Phyre2 PDB 6hra chain D Region: 9 - 23 Aligned: 15 Modelled: 15 Confidence: 11.6% Identity: 27% PDB header:membrane protein Chain: D: PDB Molecule:potassium-transporting atpase kdpf subunit; PDBTitle: cryo-em structure of the kdpfabc complex in an e1 outward-facing state2 (state 1) Phyre2 PDB 6hrb chain D Region: 9 - 23 Aligned: 15 Modelled: 15 Confidence: 11.6% Identity: 27% PDB header:membrane protein Chain: D: PDB Molecule:potassium-transporting atpase kdpf subunit; PDBTitle: cryo-em structure of the kdpfabc complex in an e2 inward-facing state2 (state 2) Phyre2 PDB 5mrw chain D Region: 9 - 23 Aligned: 15 Modelled: 15 Confidence: 11.6% Identity: 27% PDB header:hydrolase Chain: D: PDB Molecule:potassium-transporting atpase kdpf subunit; PDBTitle: structure of the kdpfabc complex Phyre2 PDB 5mrw chain H Region: 9 - 23 Aligned: 15 Modelled: 15 Confidence: 11.6% Identity: 27% PDB header:hydrolase Chain: H: PDB Molecule:potassium-transporting atpase kdpf subunit; PDBTitle: structure of the kdpfabc complex Phyre2 PDB 1zp0 chain D Region: 4 - 97 Aligned: 72 Modelled: 76 Confidence: 11.4% Identity: 22% PDB header:oxidoreductase Chain: D: PDB Molecule:small cytochrome binding protein; PDBTitle: crystal structure of mitochondrial respiratory complex ii2 bound with 3-nitropropionate and 2-thenoyltrifluoroacetone Phyre2 PDB 6et5 chain B Region: 8 - 36 Aligned: 29 Modelled: 29 Confidence: 11.1% Identity: 24% PDB header:photosynthesis Chain: B: PDB Molecule: PDBTitle: reaction centre light harvesting complex 1 from blc. virids Phyre2 PDB 1xrd chain A Region: 8 - 38 Aligned: 31 Modelled: 31 Confidence: 9.0% Identity: 26% PDB header:membrane protein Chain: A: PDB Molecule:light-harvesting protein b-880, alpha chain; PDBTitle: light-harvesting complex 1 alfa subunit from wild-type2 rhodospirillum rubrum Phyre2 PDB 1xrd chain A domain 1 Region: 8 - 38 Aligned: 31 Modelled: 31 Confidence: 9.0% Identity: 26% Fold: Light-harvesting complex subunits Superfamily: Light-harvesting complex subunits Family: Light-harvesting complex subunits Phyre2 PDB 2e74 chain A domain 1 Region: 9 - 101 Aligned: 93 Modelled: 93 Confidence: 7.8% Identity: 16% Fold: Heme-binding four-helical bundle Superfamily: Transmembrane di-heme cytochromes Family: Cytochrome b of cytochrome bc1 complex (Ubiquinol-cytochrome c reductase) Phyre2 1 d1nekc_ 2 c1yq3C_ 3 c3vrbG_ 4 d1nekd_ 5 d2bs2c1 6 c5xmjG_ 7 d1kf6c_ 8 d1kf6d_ 9 d3cx5c2 10 d1q90b_ 11 c5mrwL_ 12 c6hraD_ 13 c6hrbD_ 14 c5mrwD_ 15 c5mrwH_ 16 c1zp0D_ 17 c6et5b_ 18 c1xrdA_ 19 d1xrda1 20 d2e74a1 21 22 23 24