Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
alpha bundlesalpha-helix bundles with mainly parallel helices
alpha superhelicesrepeating alpha-helix hairpins form a superhelix
alpha duplicates or obligate multimersalpha duplicates or monomers associate together to form a compact domain
alpha complex topologyalpha domain with complex and unique topology that cannot be described as array or bundle or superhelix
beta barrelssingle beta-sheet folded upon itself to form a barrel
beta meanderssingle beta-sheet with mainly meander topology
beta sandwichestwo beta-sheets stacked together to form a sandwich
beta duplicates or obligate multimersbeta duplicates or monomers associate together to form a compact domain
beta complex topologybeta domains with complex and unique topology that cannot be described as barrel or sandwich or meander
a+b two layersone alpha-helix layer and one beta-sheet layer




Representatives:
e2fdnA1[A:1-55]
nonrep
Image
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FERREDOXIN ; ligands: SF4 ; X-RAY DIFFRACTION 0.94Å
e1hfeL2[L:2-86]
nonrep
Image
Pymol
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PROTEIN (FE-ONLY HYDROGENASE (E.C.1.18.99.1) (LARGER SUBUNIT)) ; ligands: CYS,SF4 ; X-RAY DIFFRACTION 1.510Å
e1h98A1[A:1-77]
nonrep
Image
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FERREDOXIN ; ligands: F3S,SF4 ; X-RAY DIFFRACTION 1.64Å
e2c42A1[A:669-785]
nonrep
Image
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PYRUVATE-FERREDOXIN OXIDOREDUCTASE ; ligands: SF4 ; X-RAY DIFFRACTION 1.78Å
e1xerA1[A:1-103]
nonrep
Image
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FERREDOXIN ; ligands: F3S,ZN ; X-RAY DIFFRACTION 2.0Å
e3mmcB1[B:197-261]
nonrep
Image
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SULFITE REDUCTASE, DISSIMILATORY-TYPE SUBUNIT BETA ; ligands: SF4,SRM ; X-RAY DIFFRACTION 2.04Å
e5c4iE2[E:236-315]
nonrep
Image
Pymol
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Oxalate oxidoreductase subunit delta ; ligands: SF4 ; X-RAY DIFFRACTION 2.270Å
e1jb0C1[C:1-80]
nonrep
Image
Pymol
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PHOTOSYSTEM I IRON-SULFUR CENTER ; ligands: SF4 ; X-RAY DIFFRACTION 2.5Å
e5odqG4[G:240-314] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heterodisulfide reductase, subunit A ; ligands: SF4 ; X-RAY DIFFRACTION 2.15Å
e5odrA4[A:240-314] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heterodisulfide reductase, subunit A ; ligands: SF4 ; X-RAY DIFFRACTION 2.20Å
e5odrG4[G:240-314] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Heterodisulfide reductase, subunit A ; ligands: SF4 ; X-RAY DIFFRACTION 2.20Å
e6kifC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: FMN,SF4 ; ELECTRON MICROSCOPY
e6kifN1[N:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: FMN,SF4 ; ELECTRON MICROSCOPY
e6kifg1[g:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: FMN,SF4 ; ELECTRON MICROSCOPY
e6kigC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6kigN1[N:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6kigg1[g:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6pnjC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6pnjN1[N:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6pnjc1[c:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6khiI1[I:3-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NAD(P)H-quinone oxidoreductase subunit I ; ligands: LHG,SF4 ; ELECTRON MICROSCOPY
e6khjI1[I:3-191] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NAD(P)H-quinone oxidoreductase subunit I ; ligands: LHG,SF4 ; ELECTRON MICROSCOPY
e6qphC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; X-RAY DIFFRACTION 3.4Å
e6tclC11[C1:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6tclC21[C2:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6tclC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6tclCC1[CC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6l7oI1[I:2-191] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NAD(P)H-quinone oxidoreductase subunit I ; ligands: BCR,E7U,LHG,SF4 ; ELECTRON MICROSCOPY
e6l7pI1[I:3-191] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NAD(P)H-quinone oxidoreductase subunit I ; ligands: BCR,E7U,LHG,SF4 ; ELECTRON MICROSCOPY
e6tjvI1[I:2-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NAD(P)H-quinone oxidoreductase subunit I ; ligands: SF4 ; ELECTRON MICROSCOPY
e6rhzC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e6qwjC1[C:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: SF4
e6qwjH1[H:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: SF4
e6qwjh1[h:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: SF4
e6qwjc1[c:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: SF4
e6k33aC1[aC:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6k33bC1[bC:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6k33cC1[cC:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6l4uC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6sg2AAA2[AAA:2-86] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Periplasmic [Fe] hydrogenase large subunit ; ligands: SF4 ; X-RAY DIFFRACTION 1.650Å
e6sl5C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e6yxrC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e6yj4I1[I:39-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Subunit NUIM of NADH:Ubiquinone Oxidoreductase (Complex I) ; ligands: 3PE,CDL,SF4 ; ELECTRON MICROSCOPY
e6x89S81[S8:42-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6i0d91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.6Å
e6i0dO1[O:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.6Å
e6i1p91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.2Å
e6i1pO1[O:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.2Å
e6q8o91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.60Å
e6q8oO1[O:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.60Å
e6q8w91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.40Å
e6q8wO1[O:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.40Å
e6q8x91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.50Å
e6q8xO1[O:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.50Å
e6y1191[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.10Å
e6y11O1[O:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.10Å
e6ziy91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; ELECTRON MICROSCOPY
e6zjl91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; ELECTRON MICROSCOPY
e6zjn91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; ELECTRON MICROSCOPY
e6zjy91[9:25-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH-quinone oxidoreductase subunit 9 ; ligands: SF4 ; ELECTRON MICROSCOPY
e6ly5c1[c:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PsaC ; ligands: SF4 ; ELECTRON MICROSCOPY
e6yacC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e6yezC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e6traC1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6trcC1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6trcc1[c:1-80] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6trc31[3:1-80] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6trdC1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6trdc1[c:1-80] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6trd31[3:1-80] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6zk991[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkc91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkd91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zke91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkf91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkg91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkh91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zki91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkj91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkk91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkl91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkm91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkn91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zko91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkp91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkq91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkr91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zks91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkt91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zku91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e6zkv91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Mitochondrial complex I, TYKY subunit ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e7a23D1[D:45-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TYKY ; ligands: PEV,SF4 ; ELECTRON MICROSCOPY
e7a24D1[D:45-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TYKY ; ligands: PEV,SF4 ; ELECTRON MICROSCOPY
e6uzvC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6uzvc1[c:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6uzv31[3:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6zr2I1[I:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,PC1,SF4 ; ELECTRON MICROSCOPY
e6ztqI1[I:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,PC1,SF4 ; ELECTRON MICROSCOPY
e6y79I1[I:40-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Subunit NUIM of NADH:Ubiquinone Oxidoreductase (Complex I) ; ligands: 3PE,CDL,PLC,SF4 ; ELECTRON MICROSCOPY
e7ak5I1[I:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,CDL,PC1,SF4 ; ELECTRON MICROSCOPY
e7ak6I1[I:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e6l35C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7dkzC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; X-RAY DIFFRACTION 2.39Å
e6lu1C1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7coyaC1[aC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7b0nI1[I:236-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Subunit NUIM of protein NADH:Ubiquinone Oxidoreductase (Complex I) ; ligands: 3PE,CDL,SF4 ; ELECTRON MICROSCOPY
e7d0jC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7bw2C1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; X-RAY DIFFRACTION 6.500Å
e7coybC1[bC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7coycC1[cC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6m32B1[B:129-198] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem P840 reaction center iron-sulfur protein ; ligands: SF4 ; ELECTRON MICROSCOPY
e6zooC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7dwqC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7b93I1[I:1-178] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,PC1,SF4 ; ELECTRON MICROSCOPY
e7dz7C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e6zxsC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; X-RAY DIFFRACTION 3Å
e7dz8C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e6zzxC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7lx0N1[N:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6vpvC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7o1vC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7bkbL1[L:63-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran dehydrogenase, subunit G ; ligands: SF4 ; ELECTRON MICROSCOPY
e7bkbl1[l:63-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran dehydrogenase, subunit G ; ligands: SF4 ; ELECTRON MICROSCOPY
e7bkcL1[L:63-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran dehydrogenase, subunit G ; ligands: SF4 ; ELECTRON MICROSCOPY
e7bkcl1[l:63-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran dehydrogenase, subunit G ; ligands: SF4 ; ELECTRON MICROSCOPY
e7a4pC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7lx0c1[c:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7lx0C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6vpvc1[c:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6vpv31[3:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e6zzyC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7bgiC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7blxC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7ew6C1[C:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7f9oC1[C:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7f9og1[g:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7m75C1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: LMG,SF4 ; X-RAY DIFFRACTION 2.75Å
e7m76C1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: LMG,SF4 ; X-RAY DIFFRACTION 3.0Å
e7m78C1[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: LMG,SF4 ; X-RAY DIFFRACTION 3.0Å
e7o01C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ELECTRON MICROSCOPY
e7o01c1[c:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ELECTRON MICROSCOPY
e7s3dC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PsaC ; ligands: SF4 ; ELECTRON MICROSCOPY
e7s3dN1[N:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PsaC ; ligands: SF4 ; ELECTRON MICROSCOPY
e7s3dc1[c:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
PsaC ; ligands: SF4 ; ELECTRON MICROSCOPY
e7ewkC1[C:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7bkcK2[K:115-165,K:231-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran dehydrogenase, subunit F ; ligands: SF4 ; ELECTRON MICROSCOPY
e7bkck3[k:115-165,k:231-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Formylmethanofuran dehydrogenase, subunit F ; ligands: SF4 ; ELECTRON MICROSCOPY
e7wfdAC1[AC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7plmA3[A:669-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Pyruvate:ferredoxin oxidoreductase ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qsdI1[I:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7ar7I1[I:54-222] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8-A, mitochondrial ; ligands: PTY,SF4 ; ELECTRON MICROSCOPY
e7dr0C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7blzC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7ksqC1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7npaA2[A:487-543] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Coenzyme F420-dependent sulfite reductase ; ligands: EDO,LI,SF4,SRM ; X-RAY DIFFRACTION 1.550Å
e7wfeBC1[BC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7wg5AC1[AC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7wg5BC1[BC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7dr1C1[C:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7dr2aC1[aC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7dr2bC1[bC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7dr2cC1[cC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7dr2dC1[dC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7fixC11[C1:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7fixC21[C2:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7fixC31[C3:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: DGD,SF4 ; ELECTRON MICROSCOPY
e7p8nB5[B:570-624] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fe-hydrogenase, subunit beta ; ligands: SF4 ; ELECTRON MICROSCOPY
e7p91B5[B:570-624] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fe-hydrogenase, subunit beta ; ligands: SF4 ; ELECTRON MICROSCOPY
e7p92B5[B:570-624] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Fe-hydrogenase, subunit beta ; ligands: SF4 ; ELECTRON MICROSCOPY
e7plmB6[B:669-785] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Pyruvate:ferredoxin oxidoreductase ; ligands: SF4 ; ELECTRON MICROSCOPY
e7f4vaC1[aC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7f4vbC1[bC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7f4vcC1[cC:2-81] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qcoC1[C:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qcoH1[H:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qcoh1[h:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qcoc1[c:1-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Photosystem I iron-sulfur center ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qv7D3[D:6-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydrogen dependent carbon dioxide reductase subunit HydA2 ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qv7K3[K:6-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydrogen dependent carbon dioxide reductase subunit HydA2 ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qv7Q3[Q:6-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydrogen dependent carbon dioxide reductase subunit HydA2 ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qv7R3[R:6-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydrogen dependent carbon dioxide reductase subunit HydA2 ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qv7V3[V:6-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydrogen dependent carbon dioxide reductase subunit HydA2 ; ligands: SF4 ; ELECTRON MICROSCOPY
e7qv7Z3[Z:6-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydrogen dependent carbon dioxide reductase subunit HydA2 ; ligands: SF4 ; ELECTRON MICROSCOPY
e7dgqE1[E:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7dgrE1[E:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7dgsE1[E:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7dgzE1[E:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7dh0E1[E:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7dkfE21[E2:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7qskI1[I:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e7qslI1[I:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,CDL,SF4 ; ELECTRON MICROSCOPY
e7qsmI1[I:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7qsnI1[I:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,CDL,SF4 ; ELECTRON MICROSCOPY
e7qsoI1[I:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: 3PE,SF4 ; ELECTRON MICROSCOPY
e7zd691[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e7zdh91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Complex I-23kD ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e7zdj91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Complex I-23kD ; ligands: SF4 ; ELECTRON MICROSCOPY
e7zdm91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Complex I-23kD ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e7zdp91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Complex I-23kD ; ligands: SF4 ; ELECTRON MICROSCOPY
e7zeb91[9:1-176] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Complex I-23kD ; ligands: PC1,SF4 ; ELECTRON MICROSCOPY
e7v2cB1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,SF4 ; ELECTRON MICROSCOPY
e7v2dB1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,SF4 ; ELECTRON MICROSCOPY
e7v2eB1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,SF4 ; ELECTRON MICROSCOPY
e7v2fB1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,SF4 ; ELECTRON MICROSCOPY
e7v2hB1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,SF4 ; ELECTRON MICROSCOPY
e7v2kB1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,SF4 ; ELECTRON MICROSCOPY
e7v2rB1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,SF4 ; ELECTRON MICROSCOPY
e7v30B1[B:37-212] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NADH dehydrogenase [ubiquinone] iron-sulfur protein 8, mitochondrial ; ligands: PEE,PLX,SF4 ; ELECTRON MICROSCOPY
Previous Nexte2fug91[9:26-179]
nonrep
Image
Pymol
Jmol Links:
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NADH-quinone oxidoreductase chain 9 ; ligands: SF4 ; X-RAY DIFFRACTION 3.300Å
e4wz7I1[I:72-250]
nonrep
Image
Pymol
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Subunit NUIM of protein NADH:Ubiquinone Oxidoreductase (Complex I) ; ligands: SF4 ; X-RAY DIFFRACTION 3.60Å
disordered

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
a+b three layersone mainly antiparallel beta-sheet layer sandwiched between two alpha-helix layers
a+b four layerstwo beta-sheet layers sandwiched between two alpha-helix layers
a+b complex topologyalpha and beta domain with complex and unique topology that cannot be described in layers
a+b duplicates or obligate multimersalpha and beta duplicates or monomers associated together to form a compact domain
a/b barrelsrepeating beta-alpha units form a barrel
a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers
mixed a+b and a/balpha and beta domain consists of both a+b and a/b regions
few secondary structure elementsstabilized by cofactors or disulfides
extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes