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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

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

X: Sterol carrier protein-like
H: Sterol carrier protein, SCP-related
T: Sterol carrier protein, SCP-related
F: MycE_N

PF17843 CL0311

Representatives:

e3ssmA1[A:6-160] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 2.247Å

e8ia9A1[A:4-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; X-RAY DIFFRACTION 2.50Å

e8iaaB1[B:4-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; X-RAY DIFFRACTION 2.10Å

e8iaaA2[A:4-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; X-RAY DIFFRACTION 2.10Å

e3ssmB2[B:6-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 2.247Å

e3ssmD1[D:5-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 2.247Å

e3ssnA1[A:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; ligands: DMS,MVI ; X-RAY DIFFRACTION 2.392Å

e3ssnB2[B:6-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 2.392Å

e3ssnD1[D:5-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; ligands: GOL ; X-RAY DIFFRACTION 2.392Å

e3ssoA1[A:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 1.895Å

e3ssoB1[B:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 1.895Å

e3ssoC1[C:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 1.895Å

e3ssoD1[D:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 1.895Å

e3ssoE1[E:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 1.895Å

e3ssoF1[F:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 1.895Å

e3ssnC1[C:6-162] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; ligands: DMS,MVI ; X-RAY DIFFRACTION 2.392Å

e8ia9B2[B:3-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; X-RAY DIFFRACTION 2.50Å

e3ssmC1[C:-19-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Methyltransferase ; X-RAY DIFFRACTION 2.247Å

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.

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