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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: RelE-like
H: RelE-like
T: RelE-like
F: YafQ_toxin

PF15738 CL0136

Representatives:

e1z8mA1[A:1-88] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CONSERVED HYPOTHETICAL PROTEIN HP0894 ; SOLUTION NMR

e2otrA1[A:1-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYPOTHETICAL PROTEIN HP0892 ; SOLUTION NMR

e4lttA1[A:1-91] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UNCHARACTERIZED PROTEIN, TOXIN ; X-RAY DIFFRACTION 1.28Å

e4ls4A1[A:-1-88] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UNCHARACTERIZED PROTEIN, TOXIN ; ligands: BR ; X-RAY DIFFRACTION 1.66Å

e4ls4B1[B:-1-88] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UNCHARACTERIZED PROTEIN, TOXIN ; ligands: BR ; X-RAY DIFFRACTION 1.66Å

e4lsyA1[A:1-88] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UNCHARACTERIZED PROTEIN, TOXIN ; ligands: FLC ; X-RAY DIFFRACTION 1.9Å

e4lsyB1[B:1-88] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UNCHARACTERIZED PROTEIN, TOXIN ; ligands: CU,FLC ; X-RAY DIFFRACTION 1.9Å

e4nrnA1[A:1-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

metal-bound toxin ; ligands: ZN ; X-RAY DIFFRACTION 1.8Å

e4nrnB1[B:1-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

metal-bound toxin ; ligands: ZN ; X-RAY DIFFRACTION 1.8Å

e4q2uB1[B:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4q2uD1[D:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4q2uF1[F:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4q2uH1[H:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4q2uJ1[J:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4q2uL1[L:2-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4q2uN1[N:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4q2uP1[P:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRNA INTERFERASE YAFQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e4ml0B1[B:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml0D1[D:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml0F1[F:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml0H1[H:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml0J1[J:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml0L1[L:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml0N1[N:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml0P1[P:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted toxin of the YafQ-DinJ toxin-antitoxin system ; ligands: SO4 ; X-RAY DIFFRACTION 2.10Å

e4ml2A1[A:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

mRNA interferase YafQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.50Å

e4mmgA1[A:2-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

mRNA interferase YafQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.50Å

e4mmgB1[B:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

mRNA interferase YafQ ; ligands: SO4 ; X-RAY DIFFRACTION 1.50Å

e4mmjA1[A:3-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Addiction module toxin, RelE/StbE family ; ligands: SO4 ; X-RAY DIFFRACTION 1.80Å

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