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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: SH2
H: SH2
T: SH2
F: SH2_1

PF21990

Representatives:

e4po6A3[A:440-566] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Non-receptor tyrosine-protein kinase TYK2 ; X-RAY DIFFRACTION 1.990Å

e5ixiA3[A:433-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK1 ; X-RAY DIFFRACTION 2.57Å

e4z32A3[A:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e5ixdA2[A:429-476,A:500-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK1 ; X-RAY DIFFRACTION 2.85Å

e5l04A1[A:433-563] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK1 ; X-RAY DIFFRACTION 2.100Å

e4z32B3[B:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e4z32C3[C:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e4z32D3[D:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e4z32E3[E:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e4z32F3[F:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e4z32G3[G:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e4z32H3[H:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 3.04Å

e6e2qA1[A:393-515] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 2.65Å

e6e2pB3[B:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 2.83Å

e6e2pA2[A:393-515] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; ligands: SO4 ; X-RAY DIFFRACTION 2.83Å

e6e2qB2[B:393-515] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 2.65Å

e6e2qC3[C:393-515] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 2.65Å

e6e2qD4[D:393-514] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase JAK2 ; X-RAY DIFFRACTION 2.65Å

e7t6fA4[A:430-562] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ; ELECTRON MICROSCOPY

e7t6fB4[B:430-562] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ; ELECTRON MICROSCOPY

e8ewyA4[A:430-562] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ; ELECTRON MICROSCOPY

e8ewyB4[B:430-562] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tyrosine-protein kinase ; ELECTRON MICROSCOPY

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