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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: XRCC4, N-terminal domain-like
H: NE0471 N-terminal domain-like
T: NE0471 N-terminal domain-like
F: GBBH-like_N

PF06155

Representatives:

e2l6pA1[A:1-124] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

PHAC1, PHAC2 AND PHAD GENES ; SOLUTION NMR

e3luuA1[A:2-100] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein ; ligands: CL,ZN ; X-RAY DIFFRACTION 1.93Å

e3n6wA2[A:0-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gamma-butyrobetaine dioxygenase ; ligands: SO4,ZN ; X-RAY DIFFRACTION 2.000Å

e2l6nA1[A:1-132] Image Pymol Jmol Links: PDB, SCOP, CATH

UNCHARACTERIZED PROTEIN YP_001092504.1 ; SOLUTION NMR

e3ms5A2[A:0-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gamma-butyrobetaine dioxygenase ; ligands: EDO,ZN ; X-RAY DIFFRACTION 1.82Å

e3o2gA2[A:0-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Gamma-butyrobetaine dioxygenase ; ligands: EDO,ZN ; X-RAY DIFFRACTION 1.78Å

e4bg1A2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: 16D,ZN ; X-RAY DIFFRACTION 1.88Å

e4bgkA2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: 16D,ZN ; X-RAY DIFFRACTION 2.18Å

e4bgmA2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: 16D,ZN ; X-RAY DIFFRACTION 2.40Å

e4bhfA2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: 16D,ZN ; X-RAY DIFFRACTION 2.05Å

e4bhiA2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: 16D,ZN ; X-RAY DIFFRACTION 2.15Å

e4c5wA2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: 16D,ZN ; X-RAY DIFFRACTION 1.70Å

e4bhgA2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: 16D,ZN ; X-RAY DIFFRACTION 1.85Å

e4c8rA2[A:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: ZN ; X-RAY DIFFRACTION 2.82Å

e4c8rB2[B:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: ZN ; X-RAY DIFFRACTION 2.82Å

e4c8rC2[C:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: EDO,ZN ; X-RAY DIFFRACTION 2.82Å

e4c8rD2[D:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: ZN ; X-RAY DIFFRACTION 2.82Å

e4c8rE2[E:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: ZN ; X-RAY DIFFRACTION 2.82Å

e4c8rF2[F:1-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: ZN ; X-RAY DIFFRACTION 2.82Å

e4cwdA2[A:0-104] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GAMMA-BUTYROBETAINE DIOXYGENASE ; ligands: PEG,ZN ; X-RAY DIFFRACTION 1.90Å

e6npcB1[B:-2-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TmpA, 2-trimethylaminoethylphosphonate hydroxylase ; X-RAY DIFFRACTION 1.700Å

e6npbA1[A:-1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TmpA, 2-trimethylaminoethylphosphonate hydroxylase ; X-RAY DIFFRACTION 1.730Å

e6npbB1[B:-1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TmpA, 2-trimethylaminoethylphosphonate hydroxylase ; X-RAY DIFFRACTION 1.730Å

e6npcA2[A:-1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TmpA, 2-trimethylaminoethylphosphonate hydroxylase ; X-RAY DIFFRACTION 1.700Å

e6npdA1[A:-1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TmpA, 2-trimethylaminoethylphosphonate hydroxylase ; X-RAY DIFFRACTION 1.780Å

e6npdB2[B:-1-102] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TmpA, 2-trimethylaminoethylphosphonate hydroxylase ; X-RAY DIFFRACTION 1.780Å

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