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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

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

X: P-loop domains-like
H: P-loop domains-related
T: P-loop containing nucleoside triphosphate hydrolases
F: TK

PF00265 CL0023

Representatives:

e2b8tA2[A:11-149] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: THM ; X-RAY DIFFRACTION 2.00Å

e2b8tB2[B:11-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: THM ; X-RAY DIFFRACTION 2.00Å

e2uz3B2[B:11-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.500Å

e2uz3C2[C:11-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 2.500Å

e2b8tC2[C:11-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: THM ; X-RAY DIFFRACTION 2.00Å

e1xbtH2[H:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e1xbtD2[D:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e1xbtA2[A:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e2orvA2[A:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: 4TA ; X-RAY DIFFRACTION 2.080Å

e1xbtB2[B:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e2orvB2[B:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: 4TA ; X-RAY DIFFRACTION 2.080Å

e1xbtE2[E:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e2b8tD2[D:12-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: THM,TRS ; X-RAY DIFFRACTION 2.00Å

e2uz3D2[D:11-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.500Å

e2uz3A2[A:11-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 2.500Å

e1xbtC2[C:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e1xbtF2[F:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e2wvjA2[A:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: TTP ; X-RAY DIFFRACTION 2.20Å

e2j9rA1[A:-1-142] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: PO4,THM ; X-RAY DIFFRACTION 2.7Å

e1w4rC1[C:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 1.83Å

e1w4rD1[D:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 1.83Å

e1w4rE1[E:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: DTU,TTP ; X-RAY DIFFRACTION 1.83Å

e1w4rF1[F:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 1.83Å

e1w4rG1[G:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 1.83Å

e1w4rH1[H:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 1.83Å

e2wvjD2[D:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.20Å

e2wvjB1[B:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: TTP ; X-RAY DIFFRACTION 2.20Å

e2wvjC1[C:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: TTP ; X-RAY DIFFRACTION 2.20Å

e2wvjE1[E:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: TTP ; X-RAY DIFFRACTION 2.20Å

e2wvjF1[F:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: TTP ; X-RAY DIFFRACTION 2.20Å

e2wvjG1[G:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.20Å

e1w4rB4[B:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: DTU,TTP ; X-RAY DIFFRACTION 1.83Å

e2wvjH6[H:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE, CYTOSOLIC ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.20Å

e2ja1A5[A:-1-141] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MPD,TTP ; X-RAY DIFFRACTION 2.800Å

e2j87B5[B:4-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.1Å

e2j87D5[D:4-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.1Å

e2qpoC2[C:2-39,C:59-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e1w4rA4[A:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: TTP ; X-RAY DIFFRACTION 1.83Å

e1xx6B3[B:2-45,B:65-141] Image Pymol Jmol Links: PDB, SCOP, CATH

Thymidine kinase ; ligands: ADP ; X-RAY DIFFRACTION 2.0Å

e1xx6A3[A:2-141] Image Pymol Jmol Links: PDB, SCOP, CATH

Thymidine kinase ; ligands: ADP ; X-RAY DIFFRACTION 2.0Å

e2j87C3[C:4-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.1Å

e3e2iA3[A:7-142] Image Pymol Jmol Links: PDB, SCOP, CATH

Thymidine kinase ; ligands: GOL ; X-RAY DIFFRACTION 2.010Å

e2j87A3[A:4-135] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.1Å

e1xbtG2[G:18-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase, cytosolic ; ligands: MG,TTP ; X-RAY DIFFRACTION 2.25Å

e2qpoA2[A:2-39,A:60-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e4uxhA2[A:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: T5A ; X-RAY DIFFRACTION 2.40Å

e4uxjB2[B:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

e4uxjC2[C:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

e4uxjD2[D:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

e4uxjG1[G:3-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

e4uxjH1[H:3-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

e4uxhB2[B:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: T5A ; X-RAY DIFFRACTION 2.40Å

e4uxiA2[A:2-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: PO4,THM ; X-RAY DIFFRACTION 2.74Å

e4uxiB2[B:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: PO4,THM ; X-RAY DIFFRACTION 2.74Å

e4uxjA2[A:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

e4uxjF1[F:3-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

e2qq0A1[A:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: ANP,MG,THM ; X-RAY DIFFRACTION 1.5Å

e2qq0B2[B:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: ADP,MG,TMP ; X-RAY DIFFRACTION 1.5Å

e2qpoD1[D:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e2qpoB1[B:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: SO4 ; X-RAY DIFFRACTION 1.95Å

e2orwB1[B:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: 4TA,MG ; X-RAY DIFFRACTION 1.5Å

e2orwA1[A:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: 4TA,MG ; X-RAY DIFFRACTION 1.5Å

e2qqeB1[B:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: THM ; X-RAY DIFFRACTION 1.9Å

e2qqeA2[A:2-136] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Thymidine kinase ; ligands: THM ; X-RAY DIFFRACTION 1.9Å

e5fuyD2[D:203-242,D:262-323] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.80Å

e5fuvA2[A:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: GOL,PO4,THM ; X-RAY DIFFRACTION 2.30Å

e5fuvB1[B:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: GOL,THM ; X-RAY DIFFRACTION 2.30Å

e5fuwA2[A:203-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.20Å

e5fuwB2[B:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,THM ; X-RAY DIFFRACTION 2.20Å

e5fuxA1[A:203-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: MG,PO4,QBT ; X-RAY DIFFRACTION 2.20Å

e5fuxB2[B:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.20Å

e5fuyA1[A:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.80Å

e5fuyB1[B:205-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.80Å

e5fuyC1[C:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.80Å

e5fuyE2[E:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.80Å

e5fuyF2[F:204-324] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMDINE KINASE ; ligands: PO4,QBT ; X-RAY DIFFRACTION 2.80Å

e4uxjE2[E:3-122] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

THYMIDINE KINASE ; ligands: MG,TTP ; X-RAY DIFFRACTION 3.00Å

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.

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