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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

X: Immunoglobulin-like beta-sandwich
H: Immunoglobulin-related
T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like
F: IL3Rb_N

PF21460 CL0159

Representatives:

e2gysA1[A:1-103] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cytokine receptor common beta chain ; X-RAY DIFFRACTION 2.7Å

e1gh7A1[A:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CYTOKINE RECEPTOR COMMON BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e4qqvA3[A:7-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-3 receptor class 2 subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.45Å

e1gh7B1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CYTOKINE RECEPTOR COMMON BETA CHAIN ; X-RAY DIFFRACTION 3.0Å

e2gysB1[B:1-103] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cytokine receptor common beta chain ; X-RAY DIFFRACTION 2.7Å

e3cxeA1[A:25-127] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: NAG

e4qqvB3[B:7-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-3 receptor class 2 subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.45Å

e4qqvC3[C:7-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-3 receptor class 2 subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.45Å

e4qqvD3[D:7-109] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-3 receptor class 2 subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.45Å

e4nkqA4[A:25-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cytokine receptor common subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.300Å

e5dwuA1[A:26-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cytokine receptor common subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.970Å

e6nmyA2[A:25-127] Image Pymol Jmol Links: PDB, SCOP, CATH

Cytokine receptor common subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.300Å

e6nmyC2[C:25-127] Image Pymol Jmol Links: PDB, SCOP, CATH

Cytokine receptor common subunit beta ; ligands: NAG ; X-RAY DIFFRACTION 3.300Å

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.

X: Glycosyl hydrolase domain-like

some similarity with Ig fold

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