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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

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

X: C-terminal domain of poxin
H: C-terminal domain of poxin
T: C-terminal domain of poxin
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.

Representatives:

e6ea8A2[A:116-194] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; ligands: J2A ; X-RAY DIFFRACTION 2.60Å

e6ea6A2[A:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 1.70Å

e6ea6C2[C:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 1.70Å

e6ea6B2[B:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 1.70Å

e6ea6D2[D:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 1.70Å

e6ea8B2[B:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.60Å

e6ea8C2[C:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.60Å

e6ea8D2[D:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.60Å

e6ea8E2[E:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; ligands: J2A ; X-RAY DIFFRACTION 2.60Å

e6ea8F2[F:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.60Å

e6ea8G2[G:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; ligands: J2B ; X-RAY DIFFRACTION 2.60Å

e6ea8H2[H:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.60Å

e6ea8I2[I:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.60Å

e6ea8J2[J:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.60Å

e6ea9A2[A:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; ligands: 9BG ; X-RAY DIFFRACTION 2.10Å

e6ea9B2[B:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; ligands: 9BG ; X-RAY DIFFRACTION 2.10Å

e6ea9C2[C:116-195] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; ligands: 9BG ; X-RAY DIFFRACTION 2.10Å

e6ea9D2[D:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; ligands: 9BG ; X-RAY DIFFRACTION 2.10Å

e6ea9E2[E:116-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein B2 ; X-RAY DIFFRACTION 2.10Å

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