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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: SH3
H: SH3
T: SH3
F: Ribosomal_L21e

PF01157 CL0010

Representatives:

e1vqoQ1[Q:1-95] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

50S RIBOSOMAL PROTEIN L21E ; ligands: CL,NA ; X-RAY DIFFRACTION 2.2Å

e8hl2L21E1[L21E:2-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

50S ribosomal protein L21e ; ELECTRON MICROSCOPY

e8hl5L21E1[L21E:2-98] Image Pymol Jmol Links: PDB, SCOP, CATH

; ELECTRON MICROSCOPY

e8bpoS21[S2:2-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8fl6LE1[LE:2-158] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8p2kBT1[BT:2-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

60S ribosomal protein L21 ; ligands: MG,SPD,UNX ; ELECTRON MICROSCOPY

e8idtc1[c:2-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8bhfG11[G1:2-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e8eubAT1[AT:2-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ligands: MG ; ELECTRON MICROSCOPY

e8q5i21[2:2-160] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

; ligands: MG ; ELECTRON MICROSCOPY

e8ccsF1[F:2-160] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

60S ribosomal protein L21-A ; ligands: MG ; ELECTRON MICROSCOPY

e8a98S1[S:2-153] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative 60S ribosomal protein L21 ; ELECTRON MICROSCOPY

Previous
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