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
Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365
54123, 3-crossover-4
Representatives:
e1hr0W1[W:1-71] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSLATION INITIATION FACTOR ; ligands: MG ; X-RAY DIFFRACTION 3.2Å
e1ah9A1[A:1-70] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
INITIATION FACTOR 1 ; SOLUTION NMR
e3i4oA1[A:6-73] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; X-RAY DIFFRACTION 1.470Å
e2oqkA1[A:22-115] Image Pymol Jmol Links: PDB, SCOP, CATH
PUTATIVE TRANSLATION INITIATION FACTOR EIF-1A ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å
e3zjyC1[C:28-108] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EUKARYOTIC TRANSLATION INITIATION FACTOR 1A, X-CHROMOSOMAL ; X-RAY DIFFRACTION 3.6Å
e3i4oB1[B:7-73] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; X-RAY DIFFRACTION 1.470Å
e1zo1W1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
translation Initiation Factor 1 ; ELECTRON MICROSCOPY
e2dgyA1[A:10-120] Image Pymol Jmol Links: PDB, SCOP, CATH
MGC11102 protein ; SOLUTION NMR
e4bpe01[0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e4bpn01[0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e4bpo01[0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e4bpp01[0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e4kzyn1[n:32-113] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HUMAN INITIATION FACTOR EIF1A ; X-RAY DIFFRACTION 7.01Å
e4kzzn1[n:32-113] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HUMAN INITIATION FACTOR EIF1A ; X-RAY DIFFRACTION 7.03Å
e4ql5A1[A:5-72] Image Pymol Jmol Links: PDB, SCOP, CATH
Translation initiation factor IF-1 ; ligands: ZN ; X-RAY DIFFRACTION 2.02Å
e4ql5B1[B:7-72] Image Pymol Jmol Links: PDB, SCOP, CATH
Translation initiation factor IF-1 ; ligands: ACT,GOL,ZN ; X-RAY DIFFRACTION 2.02Å
e4mnoA1[A:13-107] Image Pymol Jmol Links: PDB, SCOP, CATH
Translation initiation factor 1A ; X-RAY DIFFRACTION 1.35Å
e3j80i1[i:22-117] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eIF1A ; ELECTRON MICROSCOPY
e3j81i1[i:5-115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eIF1A ; ligands: MET,MG ; ELECTRON MICROSCOPY
e4uer01[0:18-117] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EIF1A ; ELECTRON MICROSCOPY
e4btsA01[A0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSLATION INITIATION FACTOR EIF-1A FAMILY PROTEIN ; X-RAY DIFFRACTION 3.70Å
e4btsB01[B0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSLATION INITIATION FACTOR EIF-1A FAMILY PROTEIN ; X-RAY DIFFRACTION 3.70Å
e4btsC01[C0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSLATION INITIATION FACTOR EIF-1A FAMILY PROTEIN ; X-RAY DIFFRACTION 3.70Å
e4btsD01[D0:18-116] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSLATION INITIATION FACTOR EIF-1A FAMILY PROTEIN ; X-RAY DIFFRACTION 3.70Å
e2n3sA1[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH
Translation initiation factor IF-1 ; SOLUTION NMR
e3japi1[i:5-115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eIF1A ; ligands: MET,MG ; ELECTRON MICROSCOPY
e3jaqi1[i:21-115] Image Pymol Jmol Links: PDB, SCOP, CATH
e3jami1[i:22-117] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
eIF1A ; ELECTRON MICROSCOPY
e2n78A1[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; SOLUTION NMR
e5lmnW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ELECTRON MICROSCOPY
e5lmoW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ligands: A,G,MG,U ; ELECTRON MICROSCOPY
e5lmpW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ligands: MG ; ELECTRON MICROSCOPY
e5lmqW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ligands: MG ; ELECTRON MICROSCOPY
e5lmrW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ligands: MG ; ELECTRON MICROSCOPY
e5lmsW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ligands: MG ; ELECTRON MICROSCOPY
e5lmtW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ligands: MG ; ELECTRON MICROSCOPY
e5lmvW1[W:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ligands: MG ; ELECTRON MICROSCOPY
e2n8nA1[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; SOLUTION NMR
e5jb361[6:13-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e5jbh61[6:13-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
aIF1A ; ELECTRON MICROSCOPY
e5me0V1[V:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ELECTRON MICROSCOPY
e5me1V1[V:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ELECTRON MICROSCOPY
e2nchA1[A:1-87] Image Pymol Jmol Links: PDB, SCOP, CATH
Translation initiation factor IF-1 ; SOLUTION NMR
e6fyxi1[i:2-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A ; ligands: MET,MG ; ELECTRON MICROSCOPY
e6fyyi1[i:2-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A ; ligands: MET,MG ; ELECTRON MICROSCOPY
e6c00A1[A:1-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; SOLUTION NMR
e6o7k51[5:1-71] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor IF-1 ; ELECTRON MICROSCOPY
e6gsni1[i:5-115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A ; ELECTRON MICROSCOPY
e6gsmi1[i:21-115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A ; ELECTRON MICROSCOPY
e6sw961[6:13-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e6swc61[6:13-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e6swd61[6:13-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e6swe61[6:13-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e6zp4G1[G:23-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A, X-chromosomal ; ELECTRON MICROSCOPY
e7a09G1[G:23-110] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A, X-chromosomal ; ELECTRON MICROSCOPY
e6ybwq1[q:22-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A, X-chromosomal ; ELECTRON MICROSCOPY
e6zmwq1[q:22-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A, X-chromosomal ; ELECTRON MICROSCOPY
e6zcei1[i:19-115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A ; ELECTRON MICROSCOPY
e6zu9A1[A:19-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A ; ELECTRON MICROSCOPY
e6zxfj1[j:3-107,j:138-147] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable RNA-binding protein EIF1AD ; ELECTRON MICROSCOPY
e6zxgj1[j:2-107,j:138-147] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable RNA-binding protein EIF1AD ; ELECTRON MICROSCOPY
e6zxhj1[j:2-107,j:138-147] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Probable RNA-binding protein EIF1AD ; ELECTRON MICROSCOPY
e7qp6q1[q:22-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 1A, X-chromosomal ; ELECTRON MICROSCOPY
e7tql41[4:24-113] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor eIF1A ; ELECTRON MICROSCOPY
e7zag61[6:16-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e7zah61[6:16-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e7zai61[6:16-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e7zki61[6:16-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Translation initiation factor 1A ; ELECTRON MICROSCOPY
e8cahi1[i:19-115] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 4C ; ELECTRON MICROSCOPY
e8casA1[A:19-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Eukaryotic translation initiation factor 4C ; ELECTRON MICROSCOPY
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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