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
![](/ecod/img/m.gif)
![](/ecod/img/m.gif)
![](/ecod/img/p.gif)
![](/ecod/img/m.gif)
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
Representatives:
e3chmA1[A:4-86]
nonrep
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COP9 signalosome complex subunit 7 ; ligands: ACT,MG ; X-RAY DIFFRACTION 1.5Å
e5vxvA1[A:43-259]
nonrep
Image
Pymol
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Peroxisomal membrane protein PEX15 ; X-RAY DIFFRACTION 1.550Å
e1hxiA1[A:334-445]
nonrep
Image
Pymol
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PEROXISOME TARGETING SIGNAL 1 RECEPTOR PEX5 ; ligands: MG ; X-RAY DIFFRACTION 1.6Å
e2fbnA1[A:22-174]
nonrep
Image
Pymol
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70 kDa peptidylprolyl isomerase, putative ; X-RAY DIFFRACTION 1.63Å
e5d08B3[B:344-376]
* nonrep
Image
Pymol
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Epoxyqueuosine reductase ; X-RAY DIFFRACTION 1.747Å
e1ihgA2[A:197-365]
nonrep
Image
Pymol
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Cyclophilin 40 ; ligands: GOL ; X-RAY DIFFRACTION 1.8Å
e5wf2A1[A:319-434]
* nonrep
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Pymol
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Uncharacterized protein ; X-RAY DIFFRACTION 1.85Å
e4apoB1[B:172-325]
* nonrep
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Pymol
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AH RECEPTOR-INTERACTING PROTEIN ; ligands: 12P,SO4 ; X-RAY DIFFRACTION 1.9Å
e5jqyA1[A:330-561]
nonrep
Image
Pymol
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Aspartyl/asparaginyl beta-hydroxylase ; X-RAY DIFFRACTION 1.99Å
e1xqrA1[A:87-350]
nonrep
Image
Pymol
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HspBP1 protein ; X-RAY DIFFRACTION 2.1Å
e4gmoA2[A:25-322,A:414-675]
* nonrep
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Pymol
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Putative uncharacterized protein ; X-RAY DIFFRACTION 2.1Å
e4nq0A1[A:13-79,A:160-346]
nonrep
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Pymol
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HAT1-interacting factor 1 ; X-RAY DIFFRACTION 2.10Å
e6fndA2[A:518-707]
nonrep
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Pymol
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Apical complex lysine methyltransferase ; ligands: EDO,GOL,SO4,ZN ; X-RAY DIFFRACTION 2.10Å
e5v5tA2[A:74-308]
* nonrep
Image
Pymol
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Conserved domain protein ; X-RAY DIFFRACTION 2.150Å
e6cf9A1[A:18-365]
nonrep
Image
Pymol
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Lytic transglycosylase ; X-RAY DIFFRACTION 2.28Å
e3kaeA3[A:3-242]
* nonrep
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Pymol
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Possible protein of nuclear scaffold ; ligands: CL,GOL ; X-RAY DIFFRACTION 2.298Å
e1tjcA1[A:143-237]
nonrep
Image
Pymol
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Prolyl 4-hydroxylase alpha-1 subunit ; X-RAY DIFFRACTION 2.3Å
e3zpjA1[A:1-356]
nonrep
Image
Pymol
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TON_1535 ; X-RAY DIFFRACTION 2.3Å
e3n71A2[A:284-468]
nonrep
Image
Pymol
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Histone lysine methyltransferase SmyD1 ; X-RAY DIFFRACTION 2.30Å
e2iw3A2[A:1-332]
nonrep
Image
Pymol
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ELONGATION FACTOR 3A ; ligands: ADP ; X-RAY DIFFRACTION 2.4Å
e5tqbB1[B:27-361]
nonrep
Image
Pymol
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Assembly chaperone of ribosomal protein L4 (Acl4) ; ligands: EDO,PEG ; X-RAY DIFFRACTION 2.4Å
e5t87C1[C:2-116]
* nonrep
Image
Pymol
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CdiI immunity protein ; X-RAY DIFFRACTION 2.40Å
e5jzuA1[A:330-562]
nonrep
Image
Pymol
Jmol Links:
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Aspartyl/asparaginyl beta-hydroxylase ; X-RAY DIFFRACTION 2.50Å
e5xxeA1[A:1-248]
nonrep
Image
Pymol
Jmol Links:
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Protection of telomeres protein poz1 ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2.500Å
e5z2cA1[A:2-446]
nonrep
Image
Pymol
Jmol Links:
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Alpha-protein kinase 1 ; ligands: AYU ; X-RAY DIFFRACTION 2.59Å
e5d6sA2[A:307-370]
* nonrep
Image
Pymol
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Epoxyqueuosine reductase ; X-RAY DIFFRACTION 2.65Å
e5ve8B1[B:40-1113]
nonrep
Image
Pymol
Jmol Links:
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Kap123 ; X-RAY DIFFRACTION 2.7Å
e4rouA1[A:277-329]
nonrep
Image
Pymol
Jmol Links:
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Mitochondrial ribonuclease P protein 3 ; X-RAY DIFFRACTION 2.713Å
e3t5vB1[B:2-337]
nonrep
Image
Pymol
Jmol Links:
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Nuclear mRNA export protein THP1 ; X-RAY DIFFRACTION 2.9Å
e2gw1A1[A:94-222,A:250-607]
nonrep
Image
Pymol
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Mitochondrial precursor proteins import receptor ; X-RAY DIFFRACTION 3.0Å
e6h3zA1[A:1454-1661]
nonrep
Image
Pymol
Jmol Links:
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CCR4-not transcription complex subunit 1 ; ligands: NA ; X-RAY DIFFRACTION 3.0Å
e3qnfA5[A:752-757,A:800-810,A:915-935]
* nonrep
Image
Pymol
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Endoplasmic reticulum aminopeptidase 1 ; X-RAY DIFFRACTION 3.00Å
e5u1sA3[A:53-1132]
nonrep
Image
Pymol
Jmol Links:
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Separin ; X-RAY DIFFRACTION 3.000Å
e5l0wB1[B:5-213]
nonrep
Image
Pymol
Jmol Links:
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Sec72 ; X-RAY DIFFRACTION 3.035Å
e5aioA1[A:131-565]
nonrep
Image
Pymol
Jmol Links:
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TRANSCRIPTION FACTOR TAU 131 KDA SUBUNIT ; X-RAY DIFFRACTION 3.15Å
e4r8aA3[A:213-346]
nonrep
Image
Pymol
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Uncharacterized protein ; X-RAY DIFFRACTION 3.17Å
e5wy3B1[B:17-402]
nonrep
Image
Pymol
Jmol Links:
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Putative uncharacterized protein ; X-RAY DIFFRACTION 3.200Å
e6f5dL1[L:6-170]
nonrep
Image
Pymol
Jmol Links:
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ATP synthase subunit p18, mitochondrial ; X-RAY DIFFRACTION 3.200Å
e4n5cD1[D:12-817]
nonrep
Image
Pymol
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CARGO-TRANSPORT PROTEIN YPP1 ; X-RAY DIFFRACTION 3.25Å
e6zpnB2[B:212-249,B:601-897,B:939-991,B:1090-1133]
* nonrep
Image
Pymol
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WD_REPEATS_REGION domain-containing protein ; X-RAY DIFFRACTION 3.5Å
e4d10L3[L:182-289]
* nonrep
Image
Pymol
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COP9 SIGNALOSOME COMPLEX SUBUNIT 4 ; X-RAY DIFFRACTION 3.80Å
e4fhmB5[B:809-961]
* nonrep
Image
Pymol
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Nucleoporin nup120 ; X-RAY DIFFRACTION 4.339Å
e3j8bM1[M:188-267]
nonrep
Image
Pymol
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Eukaryotic translation initiation factor 3 subunit M ; ELECTRON MICROSCOPY
e3javA7[A:728-791,A:825-900,A:960-1102]
* nonrep
Image
Pymol
Jmol Links:
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Inositol 1,4,5-trisphosphate receptor type 1 ; ELECTRON MICROSCOPY
e4ui9C3[C:467-557]
* nonrep
Image
Pymol
Jmol Links:
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CELL DIVISION CYCLE PROTEIN 23 HOMOLOG ; ELECTRON MICROSCOPY
e4ui9N1[N:15-431]
nonrep
Image
Pymol
Jmol Links:
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ANAPHASE-PROMOTING COMPLEX SUBUNIT 2 ; ELECTRON MICROSCOPY
e4ui9N2[N:432-563]
nonrep
Image
Pymol
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ANAPHASE-PROMOTING COMPLEX SUBUNIT 2 ; ELECTRON MICROSCOPY
e4ui9Y1[Y:36-552]
nonrep
Image
Pymol
Jmol Links:
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ANAPHASE-PROMOTING COMPLEX SUBUNIT 7 ; ELECTRON MICROSCOPY
e5g04X1[X:36-110,X:132-540]
* nonrep
Image
Pymol
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ANAPHASE-PROMOTING COMPLEX SUBUNIT 7 ; ELECTRON MICROSCOPY
e5ganJ1[J:155-898]
nonrep
Image
Pymol
Jmol Links:
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Pre-mRNA-splicing factor 6 ; ELECTRON MICROSCOPY
e5gm6v1[v:551-753]
* nonrep
Image
Pymol
Jmol Links:
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Pre-mRNA-splicing factor SYF1 ; ELECTRON MICROSCOPY
e5jpqG1[G:2106-3241]
* nonrep
Image
Pymol
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UTP10 ; ELECTRON MICROSCOPY
e5wsgv1[v:156-819]
nonrep
Image
Pymol
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Syf1,Pre-mRNA-splicing factor SYF1,Syf1,Pre-mRNA-splicing factor SYF1,Syf1,Pre-mRNA-splicing factor SYF1,Syf1 ; ELECTRON MICROSCOPY
e6bqsA1[A:22-222]
nonrep
Image
Pymol
Jmol Links:
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hypothetical protein PG_2227 ; SOLUTION NMR
e6hiwDJ1[DJ:10-324]
* nonrep
Image
Pymol
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mS57 ; ligands: UTP ; ELECTRON MICROSCOPY
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