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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

X: Ferritin/Heme oxygenase/4-helical cytokines
H: 4-helical cytokines
T: 4-helical cytokines
F: IL2

PF00715 CL0053

Representatives:

e1m47A1[A:6-133] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e1m4bA1[A:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; ligands: NMP ; X-RAY DIFFRACTION 2.13Å

e1m4cA1[A:6-131] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; X-RAY DIFFRACTION 2.4Å

e2erjD1[D:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.0Å

e1irlA1[A:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; SOLUTION NMR

e1py2B1[B:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; ligands: FRH,ZN ; X-RAY DIFFRACTION 2.8Å

e1py2D1[D:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; ligands: FRH ; X-RAY DIFFRACTION 2.8Å

e1m4cB1[B:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; X-RAY DIFFRACTION 2.4Å

e1m48A1[A:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; ligands: FRG ; X-RAY DIFFRACTION 1.95Å

e1m49A1[A:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; ligands: CMM ; X-RAY DIFFRACTION 2.0Å

e3inkD1[D:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; X-RAY DIFFRACTION 2.5Å

e1m48B1[B:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; ligands: FRG ; X-RAY DIFFRACTION 1.95Å

e1pw6A1[A:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: FRB,SO4 ; X-RAY DIFFRACTION 2.6Å

e1m4aA1[A:7-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; ligands: GOL,MPE ; X-RAY DIFFRACTION 2.18Å

e1nbpA1[A:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: MHC,SO4 ; X-RAY DIFFRACTION 2.2Å

e2erjH1[H:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.0Å

e3inkC1[C:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; X-RAY DIFFRACTION 2.5Å

e1m49B1[B:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

interleukin-2 ; ligands: CMM ; X-RAY DIFFRACTION 2.0Å

e1pw6B1[B:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: FRB ; X-RAY DIFFRACTION 2.6Å

e1py2A1[A:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; ligands: FRH ; X-RAY DIFFRACTION 2.8Å

e2b5iA1[A:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.2Å

e1z92A1[A:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; X-RAY DIFFRACTION 2.8Å

e1py2C1[C:7-131] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERLEUKIN-2 ; ligands: FRH,ZN ; X-RAY DIFFRACTION 2.8Å

e3qazA1[A:2-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e1qvnB1[B:4-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: FRI,ZN ; X-RAY DIFFRACTION 2.7Å

e1qvnC1[C:4-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: FRI,ZN ; X-RAY DIFFRACTION 2.7Å

e1qvnA1[A:4-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: FRI,ZN ; X-RAY DIFFRACTION 2.7Å

e1qvnD1[D:4-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: FRI,ZN ; X-RAY DIFFRACTION 2.7Å

e3qazS1[S:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qazh1[h:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qazP1[P:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qazM1[M:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qaze1[e:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qb1F1[F:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e3qazJ1[J:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qb1A1[A:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e3qazD1[D:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qazV1[V:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qazb1[b:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qazG1[G:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qazY1[Y:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.8Å

e3qb1B1[B:-2-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e3qb1H2[H:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e3qb1C2[C:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e3qb1E2[E:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e3qb1G2[G:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e3qb1D2[D:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.100Å

e4nejA1[A:4-133] Image Pymol Jmol Links: PDB, SCOP, CATH

Interleukin-2 ; ligands: 2K1 ; X-RAY DIFFRACTION 1.919Å

e4nemA1[A:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH

Interleukin-2 ; ligands: 2JY ; X-RAY DIFFRACTION 1.93Å

e4yqxA1[A:26-147] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.820Å

e4yueC1[C:26-146] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.190Å

e4yqxM1[M:25-147] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.820Å

e4zf7A1[A:5-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin 2 ; ligands: PEG,PG4,SO4 ; X-RAY DIFFRACTION 1.89Å

e4zf7B1[B:6-132] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin 2 ; ligands: 1PE,SO4 ; X-RAY DIFFRACTION 1.89Å

e5lqbA1[A:26-153] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 1.95Å

e5m5eD1[D:4-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: CYS,SO4 ; X-RAY DIFFRACTION 2.3Å

e5utzA1[A:1-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.747Å

e5utzE1[E:6-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.747Å

e5utzD1[D:5-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.747Å

e5utzI1[I:4-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.747Å

e6vwuA3[A:3-137] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2,Interleukin-2 receptor subunit alpha ; X-RAY DIFFRACTION 3.4Å

e6ye3C1[C:-2-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.89Å

e6ye3F1[F:-1-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.89Å

e6ye3I1[I:-3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.89Å

e7dr4J1[J:5-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.49Å

e7dr4G1[G:8-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.49Å

e7dr4I1[I:8-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.49Å

e7dr4K1[K:5-133] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.49Å

e7m2gA1[A:23-152] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.788Å

e7ra9A1[A:10-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: EPE,PO4 ; X-RAY DIFFRACTION 2.2Å

e7raaB1[B:0-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: MG ; X-RAY DIFFRACTION 2.69Å

e7raaA1[A:2-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; ligands: MG ; X-RAY DIFFRACTION 2.69Å

e7raaC1[C:0-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.69Å

e7raaD1[D:1-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 2.69Å

e7zmzA1[A:4-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interleukin-2 ; X-RAY DIFFRACTION 3.2Å

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.

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

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