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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

X: SRF-like
H: SRF-like
T: SRF-like
F: SRF-TF

PF00319

Representatives:

e1egwA1[A:2-72] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MADS BOX TRANSCRIPTION ENHANCER FACTOR 2, POLYPEPTIDE A ; X-RAY DIFFRACTION 1.5Å

e1mnmA1[A:15-99] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (MCM1 TRANSCRIPTIONAL REGULATOR) ; X-RAY DIFFRACTION 2.250Å

e1mnmB1[B:18-98] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (MCM1 TRANSCRIPTIONAL REGULATOR) ; X-RAY DIFFRACTION 2.250Å

e1hbxA1[A:140-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERUM RESPONSE FACTOR ; X-RAY DIFFRACTION 3.15Å

e1hbxD1[D:140-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERUM RESPONSE FACTOR ; X-RAY DIFFRACTION 3.15Å

e1srsA1[A:140-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (SERUM RESPONSE FACTOR (SRF)) ; X-RAY DIFFRACTION 3.200Å

e1hbxE1[E:140-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERUM RESPONSE FACTOR ; X-RAY DIFFRACTION 3.15Å

e1hbxB1[B:140-223] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SERUM RESPONSE FACTOR ; X-RAY DIFFRACTION 3.15Å

e1k6oC1[C:140-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Serum response factor ; X-RAY DIFFRACTION 3.19Å

e1srsB1[B:140-219] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (SERUM RESPONSE FACTOR (SRF)) ; X-RAY DIFFRACTION 3.200Å

e1k6oB1[B:140-221] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Serum response factor ; X-RAY DIFFRACTION 3.19Å

e6byyA1[A:2-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; ligands: 1PG ; X-RAY DIFFRACTION 2.3Å

e6byyB1[B:2-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; ligands: 1PG ; X-RAY DIFFRACTION 2.3Å

e6byyC1[C:2-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; X-RAY DIFFRACTION 2.3Å

e6byyD1[D:2-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; ligands: 1PG ; X-RAY DIFFRACTION 2.3Å

e6c9lB1[B:6-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.3Å

e6bz1C1[C:2-91] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; X-RAY DIFFRACTION 3.0Å

e6c9lC1[C:5-89] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.3Å

e6bz1A1[A:2-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; X-RAY DIFFRACTION 3.0Å

e6c9lA1[A:7-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.3Å

e6c9lD1[D:7-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.3Å

e6c9lF1[F:8-89] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.3Å

e6c9lE1[E:9-72] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.3Å

e6bz1D1[D:2-88] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; X-RAY DIFFRACTION 3.0Å

e6bz1B1[B:2-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 CHIMERA ; X-RAY DIFFRACTION 3.0Å

e6wc5B1[B:2-91] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.9Å

e6wc2D1[D:2-94] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 Chimera,Myocyte-specific enhancer factor 2B,Myocyte-specific enhancer factor 2A ; X-RAY DIFFRACTION 2.1Å

e6wc5A1[A:2-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.9Å

e6wc5C1[C:2-91] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.9Å

e6wc5D1[D:2-91] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte-specific enhancer factor 2B ; X-RAY DIFFRACTION 2.9Å

e6wc2A1[A:2-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 Chimera,Myocyte-specific enhancer factor 2B,Myocyte-specific enhancer factor 2A ; X-RAY DIFFRACTION 2.1Å

e6wc2B1[B:5-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 Chimera,Myocyte-specific enhancer factor 2B,Myocyte-specific enhancer factor 2A ; X-RAY DIFFRACTION 2.1Å

e6wc2I1[I:2-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 Chimera,Myocyte-specific enhancer factor 2B,Myocyte-specific enhancer factor 2A ; X-RAY DIFFRACTION 2.1Å

e6wc2J1[J:2-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 Chimera,Myocyte-specific enhancer factor 2B,Myocyte-specific enhancer factor 2A ; X-RAY DIFFRACTION 2.1Å

e6wc2C1[C:2-90] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEF2 Chimera,Myocyte-specific enhancer factor 2B,Myocyte-specific enhancer factor 2A ; X-RAY DIFFRACTION 2.1Å

e7x1nB1[B:5-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte enhancer factor 2D/deleted in azoospermia associated protein 1 fusion protein ; X-RAY DIFFRACTION 3.315Å

e7x1nC1[C:2-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte enhancer factor 2D/deleted in azoospermia associated protein 1 fusion protein ; X-RAY DIFFRACTION 3.315Å

e7x1nA1[A:5-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte enhancer factor 2D/deleted in azoospermia associated protein 1 fusion protein ; X-RAY DIFFRACTION 3.315Å

e7x1nD1[D:4-92] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Myocyte enhancer factor 2D/deleted in azoospermia associated protein 1 fusion protein ; X-RAY DIFFRACTION 3.315Å

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