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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative


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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

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

X: OB-fold
H: Nucleic acid-binding proteins
T: Nucleic acid-binding proteins

54123, 3-crossover-4

F: eIF-1a

PF01176 CL0021

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

e1d7qA1[A:15-157] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TRANSLATION INITIATION FACTOR 1A ; SOLUTION NMR

e1jt8A1[A:1-102] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROBABLE TRANSLATION INITIATION FACTOR 1A ; SOLUTION NMR

F: Unmapped domains

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