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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

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

X: Single-stranded right-handed beta-helix
H: Arctic yeast antifreeze protein
T: Arctic yeast antifreeze protein
F: Ice_binding

PF11999

Representatives:

e3uyuA1[A:21-252] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANTIFREEZE PROTEIN ; ligands: GOL ; X-RAY DIFFRACTION 1.57Å

e3uyvA1[A:21-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antifreeze protein ; X-RAY DIFFRACTION 2.43Å

e3vn3A1[A:1-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANTIFREEZE PROTEIN ; ligands: EDO ; X-RAY DIFFRACTION 0.95Å

e3uyuB1[B:21-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANTIFREEZE PROTEIN ; ligands: GOL ; X-RAY DIFFRACTION 1.57Å

e3vn3B1[B:1-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANTIFREEZE PROTEIN ; ligands: EDO ; X-RAY DIFFRACTION 0.95Å

e4nu2A1[A:61-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ANTIFREEZE PROTEIN ; X-RAY DIFFRACTION 2.1Å

e4nu3A1[A:31-256] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ICE-BINDING PROTEIN ; ligands: SO4 ; X-RAY DIFFRACTION 1.4Å

e4nuhA1[A:2-217] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ICE-BINDING PROTEIN ; ligands: PEG ; X-RAY DIFFRACTION 1.34Å

e4nu3B1[B:31-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ICE-BINDING PROTEIN ; ligands: NA,SO4 ; X-RAY DIFFRACTION 1.4Å

e3wp9A1[A:1-224] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein ; X-RAY DIFFRACTION 1.6Å

e5b5hA1[A:1-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antifreeze protein ; ligands: NA,SO4 ; X-RAY DIFFRACTION 1.00Å

e5uytA1[A:23-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein ; X-RAY DIFFRACTION 1.75Å

e5uytA2[A:227-445] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein ; ligands: NO3 ; X-RAY DIFFRACTION 1.75Å

e5uytB1[B:23-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein ; X-RAY DIFFRACTION 1.75Å

e5uytB2[B:227-425] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein ; X-RAY DIFFRACTION 1.75Å

e6bg8A1[A:1-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig domain protein, group 2 domain protein ; ligands: CL,GOL,PO4,SO4 ; X-RAY DIFFRACTION 1.597Å

e6bg8B1[B:1-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ig domain protein, group 2 domain protein ; ligands: GOL,PO4,SO4 ; X-RAY DIFFRACTION 1.597Å

e6eioA1[A:38-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antifreeze protein ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 0.84Å

e6a8kA1[A:3-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice binding protein 1 ; ligands: GOL ; X-RAY DIFFRACTION 1.4Å

e7bwxA1[A:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: SO4 ; X-RAY DIFFRACTION 1.90Å

e7bwxB1[B:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: SO4 ; X-RAY DIFFRACTION 1.90Å

e7bwxC1[C:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: SO4 ; X-RAY DIFFRACTION 1.90Å

e7bwxD1[D:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.90Å

e7bwxE1[E:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: SO4 ; X-RAY DIFFRACTION 1.90Å

e7bwxF1[F:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.90Å

e7bwyA1[A:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: GOL ; X-RAY DIFFRACTION 2.02Å

e7bwyB1[B:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: GOL ; X-RAY DIFFRACTION 2.02Å

e7bwyC1[C:1-203] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein isoform1a ; ligands: GOL ; X-RAY DIFFRACTION 2.02Å

e7dc5A1[A:1-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antifreeze protein ; ligands: SO4 ; X-RAY DIFFRACTION 1.540Å

e7dc5B1[B:1-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antifreeze protein ; ligands: SO4 ; X-RAY DIFFRACTION 1.540Å

e7ddbA1[A:1-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antifreeze protein ; ligands: MG ; X-RAY DIFFRACTION 1.700Å

e7ddbB1[B:1-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Antifreeze protein ; ligands: MG ; X-RAY DIFFRACTION 1.700Å

e7ehkA1[A:61-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ice-binding protein ; ligands: CL ; X-RAY DIFFRACTION 2.0Å

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