Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices




Representatives:
e1a6mA1[A:1-151]
nonrep
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MYOGLOBIN ; ligands: HEM,OXY,SO4 ; X-RAY DIFFRACTION 1.0Å
e1h97A1[A:1-147]
nonrep
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Globin-3 ; ligands: HEM,SO4 ; X-RAY DIFFRACTION 1.170Å
e1tu9A1[A:2-132]
nonrep
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hypothetical protein PA3967 ; ligands: EDO,HEM,PPI ; X-RAY DIFFRACTION 1.2Å
e3d1kA1[A:1-142]
nonrep
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HEMOGLOBIN SUBUNIT ALPHA-1 ; ligands: ACE,CMO,HEM ; X-RAY DIFFRACTION 1.25Å
e3d1kB1[B:1-146]
nonrep
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HEMOGLOBIN SUBUNIT BETA-1/2 ; ligands: HEM ; X-RAY DIFFRACTION 1.25Å
e1ecdA1[A:1-136]
nonrep
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ERYTHROCRUORIN (AQUO MET) ; ligands: HEM ; X-RAY DIFFRACTION 1.4Å
e1jl7A1[A:1-147]
nonrep
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MONOMER HEMOGLOBIN COMPONENT III ; ligands: CYN,HEM ; X-RAY DIFFRACTION 1.4Å
e1b0bA1[A:1-142]
nonrep
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HEMOGLOBIN ; ligands: CYN,HEM ; X-RAY DIFFRACTION 1.43Å
e1kr7A1[A:0-109]
nonrep
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Neural globin ; ligands: ACT,HEM,OXY,SO4 ; X-RAY DIFFRACTION 1.5Å
e1q1fA1[A:3-150]
nonrep
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Neuroglobin ; ligands: HEM ; X-RAY DIFFRACTION 1.50Å
e1cg5A1[A:1-141]
nonrep
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PROTEIN (HEMOGLOBIN) ; ligands: HEM ; X-RAY DIFFRACTION 1.6Å
e1cg5B1[B:1-141]
nonrep
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PROTEIN (HEMOGLOBIN) ; ligands: HEM ; X-RAY DIFFRACTION 1.6Å
e1it2A1[A:1-146]
nonrep
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HEMOGLOBIN ; ligands: HEM ; X-RAY DIFFRACTION 1.6Å
e1mbaA1[A:0-146]
nonrep
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MYOGLOBIN ; ligands: HEM ; X-RAY DIFFRACTION 1.6Å
e2qfkA1[A:1-137]
nonrep
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Dehaloperoxidase A ; ligands: HEM,NH4,SO4 ; X-RAY DIFFRACTION 1.620Å
e2gdmA1[A:1-153]
nonrep
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LEGHEMOGLOBIN (OXY) ; ligands: HEM,OXY ; X-RAY DIFFRACTION 1.7Å
e4wjgF1[F:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 3.1Å
e4wjgK1[K:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 3.1Å
e4wjgP1[P:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 3.1Å
e4wjgU1[U:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 3.1Å
e4wjgZ1[Z:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 3.1Å
e4odcA1[A:1-143] Image Pymol Jmol Links: PDB, SCOP, CATH
Hemoglobin subunit alpha ; ligands: CYN,HEM ; X-RAY DIFFRACTION 1.54Å
e4x0iA1[A:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: HEM,OXY
e4x0lA1[A:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.05Å
e4rolA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 3U7,HEM ; X-RAY DIFFRACTION 1.7Å
e4rolC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 3U7,HEM ; X-RAY DIFFRACTION 1.7Å
e4romA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 3U8,HEM ; X-RAY DIFFRACTION 1.9Å
e4romC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 3U8,HEM ; X-RAY DIFFRACTION 1.9Å
e4xs0A1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: CL,HEM ; X-RAY DIFFRACTION 2.550Å
e4yu3A1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH
hemoglobin ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.3Å
e4yu4A1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH
hemoglobin ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.8Å
e4yu4C1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH
hemoglobin ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.8Å
e5e29C1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 5JN,HEM,NO,NO3,RQ3 ; X-RAY DIFFRACTION 1.85Å
e5e29A1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 5JN,HEM,NO,RQ3 ; X-RAY DIFFRACTION 1.85Å
e5e6eA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: CMO,HEM,MBN,PO4 ; X-RAY DIFFRACTION 1.760Å
e5ee4C1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.300Å
e5ee4E1[E:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.300Å
e5hu6A1[A:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.9Å
e5jdoC1[C:2-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 3.2Å
e5jdoE1[E:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 3.2Å
e5c6eA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: CYN,HEM ; NEUTRON DIFFRACTION 2.000Å
e5kdqA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,KOH,PO4 ; X-RAY DIFFRACTION 2.15Å
e5kdqC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,KOH ; X-RAY DIFFRACTION 2.15Å
e5e83A1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 5L7,CMO,GOL,HEM ; X-RAY DIFFRACTION 1.80Å
e5e83C1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 5L7,CMO,HEM,UNL ; X-RAY DIFFRACTION 1.80Å
e5sw7A1[A:1-142] Image Pymol Jmol Links: PDB, SCOP, CATH
Hemoglobin subunit alpha ; ligands: CMO,HEM,PO4 ; X-RAY DIFFRACTION 1.85Å
e5eysA1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 1.750Å
e5f0bA1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 2.146Å
e5f2aA1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 2.100Å
e5eetA1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 2.000Å
e5eohA1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 1.900Å
e5eqmA1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 2.050Å
e5eu2A1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 1.998Å
e5ev5A1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 1.950Å
e5eyjA1[A:3-150] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Neuroglobin ; X-RAY DIFFRACTION 2.400Å
e5euiA1[A:6-139] Image Pymol Jmol Links: PDB, SCOP, CATH
HBA protein ; ligands: HEM ; X-RAY DIFFRACTION 1.45Å
e5hy8A1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH
Hemoglobin subunit alpha ; ligands: FRU,HEM,OXY ; X-RAY DIFFRACTION 2.0Å
e5hy8C1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH
Hemoglobin subunit alpha ; ligands: FRU,GLC,HEM,OXY ; X-RAY DIFFRACTION 2.0Å
e5hy8E1[E:3-139] Image Pymol Jmol Links: PDB, SCOP, CATH
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.0Å
e5hy8G1[G:3-140] Image Pymol Jmol Links: PDB, SCOP, CATH
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.0Å
e5hy8S1[S:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH
Hemoglobin subunit alpha ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.0Å
e5u3iA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 7SJ,CMO,HEM ; X-RAY DIFFRACTION 1.95Å
e5u3iC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 7SJ,CMO,HEM ; X-RAY DIFFRACTION 1.95Å
e5ufjA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 86M,CMO,HEM ; X-RAY DIFFRACTION 2.05Å
e5ufjC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 86M,CMO,HEM ; X-RAY DIFFRACTION 2.05Å
e5ucuA1[A:1-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: H2S,HEM ; X-RAY DIFFRACTION 1.797Å
e5urcA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 8MV,CMO,FUX,HEM ; X-RAY DIFFRACTION 1.85Å
e5urcC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: 8MV,CMO,FUX,HEM ; X-RAY DIFFRACTION 1.85Å
e5kerC1[C:1-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-globin ; ligands: HEM ; X-RAY DIFFRACTION 2.20Å
e5kerE1[E:1-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-globin ; ligands: HEM ; X-RAY DIFFRACTION 2.20Å
e5kerG1[G:1-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-globin ; ligands: HEM ; X-RAY DIFFRACTION 2.20Å
e5kerA1[A:1-140] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-globin ; ligands: HEM ; X-RAY DIFFRACTION 2.20Å
e5ni1A1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; ELECTRON MICROSCOPY
e5ni1C1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; ELECTRON MICROSCOPY
e5jggA1[A:1-142] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: HEM,PGO
e5ksiA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,S1P ; X-RAY DIFFRACTION 1.800Å
e5ksiC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,S1P ; X-RAY DIFFRACTION 1.800Å
e5ksjA1[A:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,S1P ; X-RAY DIFFRACTION 2.400Å
e5ksjC1[C:1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.400Å
e5lfgA1[A:0-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha-1 ; ligands: CMO,HEM ; X-RAY DIFFRACTION 1.94Å
e5lfgC1[C:0-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha-1 ; ligands: CMO,HEM ; X-RAY DIFFRACTION 1.94Å
e5x2rA1[A:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.700Å
e5x2rC1[C:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.700Å
e5x2rE1[E:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.700Å
e5x2rG1[G:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.700Å
e5x2rI1[I:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.700Å
e5x2rK1[K:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.700Å
e5x2tA1[A:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.640Å
e5x2tC1[C:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.640Å
e5x2tE1[E:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.640Å
e5x2tG1[G:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.640Å
e5x2tI1[I:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI,PEM ; X-RAY DIFFRACTION 2.640Å
e5x2tK1[K:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,PEM ; X-RAY DIFFRACTION 2.640Å
e5x2sA1[A:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.390Å
e5x2sC1[C:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.390Å
e5x2sE1[E:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.390Å
e5x2sG1[G:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.390Å
e5x2sI1[I:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI,PEM ; X-RAY DIFFRACTION 2.390Å
e5x2sK1[K:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM,PEM ; X-RAY DIFFRACTION 2.390Å
e5x2uA1[A:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.530Å
e5x2uC1[C:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.530Å
e5x2uE1[E:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.530Å
e5x2uG1[G:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.530Å
e5x2uI1[I:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HNI ; X-RAY DIFFRACTION 2.530Å
e5x2uK1[K:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hemoglobin subunit alpha ; ligands: HEM ; X-RAY DIFFRACTION 2.530Å
Previouse1cqxA2[A:1-150]
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FLAVOHEMOPROTEIN ; ligands: DGG,FAD,HEM,NA ; X-RAY DIFFRACTION 1.75Å
e1gcvB1[B:1-136]
nonrep
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HEMOGLOBIN ; ligands: HEM ; X-RAY DIFFRACTION 2.0Å
e1urvA1[A:18-171]
nonrep
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CYTOGLOBIN ; ligands: FC6,HEM ; X-RAY DIFFRACTION 2.000Å
e1ashA1[A:0-146]
nonrep
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HEMOGLOBIN (OXY) ; ligands: HEM,OXY ; X-RAY DIFFRACTION 2.15Å
e1ithA1[A:1-141]
nonrep
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HEMOGLOBIN (CYANO MET) ; ligands: CYN,HEM ; X-RAY DIFFRACTION 2.5Å
e1x9fA1[A:5-151]
nonrep
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Globin IV, extracellular ; ligands: CMO,HEM ; X-RAY DIFFRACTION 2.60Å
e1x9fB1[B:1-145]
nonrep
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Globin II, extracellular ; ligands: CMO,HEM,PO4 ; X-RAY DIFFRACTION 2.60Å
e1x9fC1[C:3-151]
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Globin III, extracellular ; ligands: CMO,HEM,PO4 ; X-RAY DIFFRACTION 2.60Å
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
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