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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

X: Glycosyl hydrolase domain-like

some similarity with Ig fold

X: SMAD/FHA domain
H: SMAD/FHA domain
T: SMAD/FHA domain
F: IRF-3

PF10401 CL0357

Representatives:

e1qwtA1[A:189-427] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; ligands: PO4 ; X-RAY DIFFRACTION 2.1Å

e1qwtB1[B:189-427] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; ligands: PO4 ; X-RAY DIFFRACTION 2.1Å

e1j2fB1[B:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; X-RAY DIFFRACTION 2.3Å

e1j2fA1[A:190-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; X-RAY DIFFRACTION 2.3Å

e3a77A1[A:189-427] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; ligands: ACY,MPD ; X-RAY DIFFRACTION 1.8Å

e3dshA1[A:222-457] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 5 ; X-RAY DIFFRACTION 2.0Å

e3a77B1[B:189-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; ligands: MPD ; X-RAY DIFFRACTION 1.8Å

e3a77C1[C:189-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; ligands: ACY,MPD ; X-RAY DIFFRACTION 1.8Å

e3a77D1[D:190-426] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INTERFERON REGULATORY FACTOR 3 ; ligands: MPD ; X-RAY DIFFRACTION 1.8Å

e1zoqB2[B:196-386] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.36Å

e1zoqA3[A:196-386] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.36Å

e5bviA1[A:239-420] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 4 ; ligands: CL ; X-RAY DIFFRACTION 2.36Å

e5bviB1[B:240-420] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 4 ; ligands: CL ; X-RAY DIFFRACTION 2.36Å

e5jejA1[A:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.0Å

e5jekA1[A:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.4Å

e5jekB1[B:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.4Å

e5jelA1[A:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 1.60Å

e5jeoA1[A:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; ligands: PO4 ; X-RAY DIFFRACTION 1.719Å

e5jerA1[A:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.90Å

e5jerC1[C:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.90Å

e5jerE1[E:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.90Å

e5jerG1[G:189-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.90Å

e5jemA1[A:196-398] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.50Å

e5jemB1[B:196-398] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.50Å

e5jemE1[E:196-398] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.50Å

e5jemG1[G:199-398] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.50Å

e5jejB1[B:189-421] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.0Å

e5oemA1[A:197-385] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 9 ; ligands: PO4 ; X-RAY DIFFRACTION 1.900Å

e5oenA1[A:206-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 9 ; X-RAY DIFFRACTION 2.919Å

e7jfmA1[A:191-388] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.23Å

e7jflA1[A:199-396] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 1.68Å

e7jflB1[B:195-396] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 1.68Å

e7jfmB1[B:195-390] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Interferon regulatory factor 3 ; X-RAY DIFFRACTION 2.23Å

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.

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