Evolutionary classification of protein domain structures
alpha arraysalpha-helix arrays with mainly perpendicular helices
alpha bundlesalpha-helix bundles with mainly parallel helices




Representatives:
e2g7sA2[A:77-192]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
transcriptional regulator, TetR family ; X-RAY DIFFRACTION 1.4Å
e2fd5A2[A:77-180]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
transcriptional regulator ; X-RAY DIFFRACTION 1.70Å
e2i10A2[A:79-194]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH
PUTATIVE TETR TRANSCRIPTIONAL REGULATOR ; ligands: NPO ; X-RAY DIFFRACTION 2.05Å
e5xazA2[A:78-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Gamma-butyrolactone receptor protein ; X-RAY DIFFRACTION 2.30Å
e3knwA2[A:83-199] Image Pymol Jmol Links: PDB, SCOP, CATH
PUTATIVE TRANSCRIPTIONAL REGULATOR (TETR/ACRR FAMILY) ; X-RAY DIFFRACTION 2.45Å
e4l62A2[A:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e5xazB1[B:78-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Gamma-butyrolactone receptor protein ; X-RAY DIFFRACTION 2.30Å
e3knwB6[B:87-198] Image Pymol Jmol Links: PDB, SCOP, CATH
PUTATIVE TRANSCRIPTIONAL REGULATOR (TETR/ACRR FAMILY) ; ligands: EDO ; X-RAY DIFFRACTION 2.45Å
e5xazD1[D:78-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Gamma-butyrolactone receptor protein ; X-RAY DIFFRACTION 2.30Å
e4l62B2[B:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e5xazF2[F:78-229] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Gamma-butyrolactone receptor protein ; X-RAY DIFFRACTION 2.30Å
e4l62C2[C:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62D2[D:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62E2[E:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62F2[F:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62G2[G:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62H2[H:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62I2[I:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62J2[J:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62K2[K:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62L2[L:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62M2[M:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62N2[N:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62O2[O:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e4l62P2[P:70-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator ; X-RAY DIFFRACTION 2.9Å
e3rd3A2[A:79-193] Image Pymol Jmol Links: PDB, SCOP, CATH
PROBABLE TRANSCRIPTIONAL REGULATOR ; X-RAY DIFFRACTION 2.4Å
e3rd3B2[B:70-184] Image Pymol Jmol Links: PDB, SCOP, CATH
PROBABLE TRANSCRIPTIONAL REGULATOR ; X-RAY DIFFRACTION 2.4Å
e4yzeA1[A:71-199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional repressor NemR ; X-RAY DIFFRACTION 2.200Å
e4yzeB2[B:71-199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional repressor NemR ; X-RAY DIFFRACTION 2.200Å
e4yzeC2[C:71-198] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional repressor NemR ; X-RAY DIFFRACTION 2.200Å
e4yzeD1[D:71-197] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional repressor NemR ; X-RAY DIFFRACTION 2.200Å
e6zuiA3[A:352-448] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional repressor NemR,Green fluorescent protein,Green fluorescent protein,HTH-type transcriptional repressor NemR ; X-RAY DIFFRACTION 2.09962866868Å
e2i10B2[B:79-194] Image Pymol Jmol Links: PDB, SCOP, CATH
PUTATIVE TETR TRANSCRIPTIONAL REGULATOR ; ligands: NPO,PGE ; X-RAY DIFFRACTION 2.05Å
e6nsmA2[A:81-196] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
TetR family transcriptional regulator CifR ; X-RAY DIFFRACTION 2.800Å
e6nsmB2[B:81-196] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
TetR family transcriptional regulator CifR ; X-RAY DIFFRACTION 2.800Å
e6nsnA1[A:81-196] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
TetR family transcriptional regulator CifR ; X-RAY DIFFRACTION 2.6Å
e6nsnB1[B:81-196] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
TetR family transcriptional regulator CifR ; X-RAY DIFFRACTION 2.6Å
e6nsrA1[A:81-196] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
TetR family transcriptional regulator CifR ; X-RAY DIFFRACTION 3.0Å
e6nsrB1[B:81-196] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
TetR family transcriptional regulator CifR ; X-RAY DIFFRACTION 3.0Å
e6nsrM2[M:81-196] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
TetR family transcriptional regulator CifR ; X-RAY DIFFRACTION 3.0Å
e3bruA1[A:97-214] Image Pymol Jmol Links: PDB, SCOP, CATH
Regulatory protein, TetR family ; X-RAY DIFFRACTION 2.300Å
e3eupA2[A:79-201] Image Pymol Jmol Links: PDB, SCOP, CATH
TRANSCRIPTIONAL REGULATOR, TETR FAMILY ; ligands: SO4 ; X-RAY DIFFRACTION 1.99Å
e3qbmA2[A:77-198] Image Pymol Jmol Links: PDB, SCOP, CATH
TetR transcriptional regulator ; ligands: MG,PEG,PGE ; X-RAY DIFFRACTION 1.80Å

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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
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