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
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
Representatives:
e5tpiA1[A:88-160,A:261-292] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Putative transcriptional regulator (LysR family) ; ligands: CL,NA ; X-RAY DIFFRACTION 1.47Å
e5tpiA2[A:161-260] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
Putative transcriptional regulator (LysR family) ; ligands: CL,NA ; X-RAY DIFFRACTION 1.47Å
e1al3A2[A:166-268] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CYS REGULON TRANSCRIPTIONAL ACTIVATOR CYSB ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å
e1al3A3[A:88-165,A:269-324] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
CYS REGULON TRANSCRIPTIONAL ACTIVATOR CYSB ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å
e2esnA3[A:174-276] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
probable transcriptional regulator ; X-RAY DIFFRACTION 2.1Å
e2esnA4[A:92-173,A:277-303] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH
probable transcriptional regulator ; X-RAY DIFFRACTION 2.1Å
e1ixcA3[A:163-266] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LYSR-TYPE REGULATORY PROTEIN ; X-RAY DIFFRACTION 2.2Å
e1ixcA4[A:90-162,A:267-294] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LYSR-TYPE REGULATORY PROTEIN ; X-RAY DIFFRACTION 2.2Å
e1uthA3[A:86-168,A:272-304] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LYSR-TYPE REGULATORY PROTEIN ; ligands: SCN ; X-RAY DIFFRACTION 2.2Å
e1i6aA2[A:163-266] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HYDROGEN PEROXIDE-INDUCIBLE GENES ACTIVATOR ; X-RAY DIFFRACTION 2.3Å
e2f7bA2[A:162-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional regulator catM ; ligands: CL,SO4 ; X-RAY DIFFRACTION 1.80Å
e2f7cA1[A:162-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional regulator catM ; ligands: CCU,SO4 ; X-RAY DIFFRACTION 2.16Å
e3glbA1[A:162-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional regulator catM ; ligands: CCU,GOL ; X-RAY DIFFRACTION 2.800Å
e3glbB1[B:162-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional regulator catM ; ligands: CCU,GOL,SO4 ; X-RAY DIFFRACTION 2.800Å
e3glbC2[C:162-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HTH-type transcriptional regulator catM ; ligands: CCU,GOL ; X-RAY DIFFRACTION 2.800Å
e2h98A2[A:162-267] Image Pymol Jmol Links: PDB, SCOP, CATH
HTH-type transcriptional regulator catM ; ligands: CL ; X-RAY DIFFRACTION 1.800Å
e2h98B2[B:162-267] Image Pymol Jmol Links: PDB, SCOP, CATH
HTH-type transcriptional regulator catM ; X-RAY DIFFRACTION 1.800Å
e3hfuA1[A:163-263] Image Pymol Jmol Links: PDB, SCOP, CATH
HTH-TYPE TRANSCRIPTIONAL REGULATOR CYNR ; ligands: AZI ; X-RAY DIFFRACTION 2.6Å
e3hfuC1[C:163-263] Image Pymol Jmol Links: PDB, SCOP, CATH
HTH-TYPE TRANSCRIPTIONAL REGULATOR CYNR ; ligands: AZI,EDO ; X-RAY DIFFRACTION 2.6Å
e3hfuD2[D:163-263] Image Pymol Jmol Links: PDB, SCOP, CATH
HTH-TYPE TRANSCRIPTIONAL REGULATOR CYNR ; ligands: AZI,EDO ; X-RAY DIFFRACTION 2.6Å
e3ho7A2[A:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OXYR ; X-RAY DIFFRACTION 1.58Å
e3ho7B1[B:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OXYR ; X-RAY DIFFRACTION 1.58Å
e2hxrA1[A:163-263] Image Pymol Jmol Links: PDB, SCOP, CATH
HTH-type transcriptional regulator cynR ; X-RAY DIFFRACTION 2.05Å
e2hxrB1[B:163-263] Image Pymol Jmol Links: PDB, SCOP, CATH
HTH-type transcriptional regulator cynR ; X-RAY DIFFRACTION 2.05Å
e1i69A1[A:163-266] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HYDROGEN PEROXIDE-INDUCIBLE GENES ACTIVATOR ; ligands: BEZ ; X-RAY DIFFRACTION 2.7Å
e1i69B2[B:1163-1266] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HYDROGEN PEROXIDE-INDUCIBLE GENES ACTIVATOR ; ligands: BEZ ; X-RAY DIFFRACTION 2.7Å
e3jv9B2[B:163-270] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRANSCRIPTIONAL REGULATOR, LYSR FAMILY ; ligands: CL ; X-RAY DIFFRACTION 2.39Å
e3t22A1[A:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
REDOX-SENSITIVE TRANSCRIPTIONAL ACTIVATOR OXYR ; X-RAY DIFFRACTION 2.2Å
e3t22B1[B:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
REDOX-SENSITIVE TRANSCRIPTIONAL ACTIVATOR OXYR ; X-RAY DIFFRACTION 2.2Å
e3t22C2[C:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
REDOX-SENSITIVE TRANSCRIPTIONAL ACTIVATOR OXYR ; X-RAY DIFFRACTION 2.2Å
e3t22D2[D:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
REDOX-SENSITIVE TRANSCRIPTIONAL ACTIVATOR OXYR ; X-RAY DIFFRACTION 2.2Å
e3ukiA2[A:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OXYR ; X-RAY DIFFRACTION 4.15Å
e3ukiB2[B:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OXYR ; X-RAY DIFFRACTION 4.15Å
e3ukiC1[C:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OXYR ; X-RAY DIFFRACTION 4.15Å
e3ukiD2[D:163-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OXYR ; X-RAY DIFFRACTION 4.15Å
e4x6gB1[B:163-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OxyR ; ligands: GOL,PEO ; X-RAY DIFFRACTION 2.0Å
e4x6gD1[D:163-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OxyR ; ligands: GOL,PEO ; X-RAY DIFFRACTION 2.0Å
e4x6gF1[F:163-283] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
OxyR ; ligands: GOL,PEO ; X-RAY DIFFRACTION 2.0Å
e5b70A1[A:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; X-RAY DIFFRACTION 2.3Å
e5b70B1[B:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; X-RAY DIFFRACTION 2.3Å
e5b70C1[C:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: GOL ; X-RAY DIFFRACTION 2.3Å
e5b70D1[D:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: GOL ; X-RAY DIFFRACTION 2.3Å
e5b7dA1[A:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: SO4 ; X-RAY DIFFRACTION 1.52Å
e5b7dB1[B:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: SO4 ; X-RAY DIFFRACTION 1.52Å
e5x0qA2[A:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: CL ; X-RAY DIFFRACTION 1.55Å
e5x0qB1[B:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: CL ; X-RAY DIFFRACTION 1.55Å
e5x0vA1[A:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: CL ; X-RAY DIFFRACTION 1.60Å
e5x0vB2[B:170-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
LysR family transcriptional regulator ; ligands: CL ; X-RAY DIFFRACTION 1.60Å
e1i6aA3[A:87-162,A:267-298] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
HYDROGEN PEROXIDE-INDUCIBLE GENES ACTIVATOR ; X-RAY DIFFRACTION 2.3Å
e3t1bA2[A:89-159,A:263-290] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator, LysR family ; X-RAY DIFFRACTION 2.40Å
e3t1bA3[A:160-262] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Transcriptional regulator, LysR family ; X-RAY DIFFRACTION 2.40Å
e5vvhD1[D:89-161,D:261-298] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Octopine catabolism/uptake operon regulatory protein OccR ; ligands: SO4 ; X-RAY DIFFRACTION 2.5Å
e5vvhD2[D:162-260] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Octopine catabolism/uptake operon regulatory protein OccR ; ligands: FMT ; X-RAY DIFFRACTION 2.5Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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