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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: Cystatin-like
H: NTF2-like
T: NTF2-like
F: SnoaL_2

PF12680 CL0051

Representatives:

e1oh0A1[A:3-127] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: EQU ; X-RAY DIFFRACTION 1.1Å

e3ebtA1[A:1-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized NTF2-like protein ; ligands: UNL ; X-RAY DIFFRACTION 1.30Å

e1z1sA1[A:1-129] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Hypothetical Protein PA3332 ; ligands: PGE ; X-RAY DIFFRACTION 1.49Å

e3er7A1[A:5-122] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized NTF2-like protein ; ligands: CL,PEG ; X-RAY DIFFRACTION 1.50Å

e3er7B1[B:5-122] Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized NTF2-like protein ; ligands: PEG ; X-RAY DIFFRACTION 1.50Å

e3f14A1[A:0-111] Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized NTF2-like protein ; ligands: PGE,TRS ; X-RAY DIFFRACTION 1.45Å

e1e97A1[A:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.0Å

e1vzzA1[A:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.3Å

e1vzzB1[B:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.3Å

e1w02A1[A:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.3Å

e1ea2A1[A:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 1.8Å

e1ohoA1[A:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH

STEROID DELTA-ISOMERASE ; ligands: EQU ; X-RAY DIFFRACTION 1.9Å

e1w6yA1[A:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: BME,EQU ; X-RAY DIFFRACTION 2.1Å

e3t8nA1[A:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.47Å

e3t8nB1[B:2-131] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 1.47Å

e3t8nF1[F:1-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: EDT ; X-RAY DIFFRACTION 1.47Å

e3owuA1[A:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: EQU ; X-RAY DIFFRACTION 1.7Å

e3owuB1[B:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: EQU ; X-RAY DIFFRACTION 1.7Å

e3owuC1[C:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: EQU ; X-RAY DIFFRACTION 1.7Å

e3owuD1[D:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: EQU ; X-RAY DIFFRACTION 1.7Å

e3ox9A1[A:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.0Å

e3ox9B1[B:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.0Å

e3ox9C1[C:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.0Å

e3ox9D1[D:2-130] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; X-RAY DIFFRACTION 2.0Å

e3t8nD1[D:1-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

STEROID DELTA-ISOMERASE ; ligands: EDT,SO4 ; X-RAY DIFFRACTION 1.47Å

e4k1uB1[B:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Steroid Delta-isomerase ; X-RAY DIFFRACTION 2.0Å

e4k1uA1[A:2-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Steroid Delta-isomerase ; X-RAY DIFFRACTION 2.0Å

e4cdlA1[A:2-127] Image Pymol Jmol Links: PDB, SCOP, CATH

STEROID DELTA-ISOMERASE ; ligands: LLK ; X-RAY DIFFRACTION 2.50Å

e4h3uA1[A:1-131] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; ligands: ACT,CD,CL ; X-RAY DIFFRACTION 1.15Å

e3i0yA1[A:2-139] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide cyclase ; ligands: CL,PEG,UNL ; X-RAY DIFFRACTION 1.50Å

e3i0yB1[B:4-138] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide cyclase ; ligands: CL,PEG,UNL ; X-RAY DIFFRACTION 1.50Å

e3i0yC1[C:3-138] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide cyclase ; ligands: CL,UNL ; X-RAY DIFFRACTION 1.50Å

e3i0yD1[D:4-139] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative polyketide cyclase ; ligands: CL,PEG,UNL ; X-RAY DIFFRACTION 1.50Å

e4hvnA1[A:2-131] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; ligands: KEN ; X-RAY DIFFRACTION 1.95Å

e4j8tA1[A:1-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.2 ; ligands: DOG ; X-RAY DIFFRACTION 2.050Å

e4j8tB1[B:2-125] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.2 ; ligands: DOG ; X-RAY DIFFRACTION 2.050Å

e4j8tC1[C:1-125] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.2 ; ligands: DOG ; X-RAY DIFFRACTION 2.050Å

e4j8tD1[D:1-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.2 ; ligands: DOG ; X-RAY DIFFRACTION 2.050Å

e4j9aA1[A:2-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aB1[B:2-124] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aC1[C:2-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aD1[D:1-125] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aE1[E:2-124] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aF1[F:2-126] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aG1[G:2-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aH1[H:2-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4j9aI1[I:1-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Engineered Digoxigenin binder protein DIG10.3 ; ligands: DOG ; X-RAY DIFFRACTION 3.200Å

e4hvnB2[B:2-131] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; ligands: KEN ; X-RAY DIFFRACTION 1.95Å

e4h3uB2[B:2-131] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein ; ligands: ACT,CD,CL ; X-RAY DIFFRACTION 1.15Å

e4pejA1[A:3-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Retro-aldolase ; X-RAY DIFFRACTION 1.85Å

e4pejB1[B:3-127] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Retro-aldolase ; X-RAY DIFFRACTION 1.85Å

e6iskA1[A:39-158] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

XimE, SnoaL-like domain protein ; ligands: MLA ; X-RAY DIFFRACTION 1.77Å

e6iskB1[B:39-158] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

XimE, SnoaL-like domain protein ; ligands: EDO,MLA ; X-RAY DIFFRACTION 1.77Å

e6islA1[A:39-158] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

XimE, SnoaL-like domain protein ; ligands: XIA ; X-RAY DIFFRACTION 1.77Å

e6islB1[B:39-158] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

XimE, SnoaL-like domain protein ; ligands: XIA ; X-RAY DIFFRACTION 1.77Å

e1ohpA1[A:1-125] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

STEROID DELTA-ISOMERASE ; ligands: ESR ; X-RAY DIFFRACTION 1.53Å

e3ec9A1[A:10-139] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized NTF2-like protein ; ligands: ACT ; X-RAY DIFFRACTION 1.60Å

e3dmcA1[A:1-133] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

NTF2-like Protein ; ligands: ACT ; X-RAY DIFFRACTION 1.65Å

e1s5aA1[A:3-141] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

HYPOTHETICAL PROTEIN YESE ; ligands: ACT,GOL ; X-RAY DIFFRACTION 1.7Å

e3dm8A1[A:1-135] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized protein RPA4348 ; ligands: CE9 ; X-RAY DIFFRACTION 1.800Å

e1tuhA1[A:19-149] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein EGC068 ; ligands: ACT ; X-RAY DIFFRACTION 1.85Å

e3en8A1[A:1-127] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized NTF-2 like protein ; ligands: ACT,CA,PEG,PG4 ; X-RAY DIFFRACTION 1.85Å

e5xe7A3[A:168-297] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ECF RNA polymerase sigma factor SigJ ; X-RAY DIFFRACTION 2.16Å

e3d9rA1[A:3-134] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

ketosteroid isomerase-like protein ; ligands: GOL,NA,UNL ; X-RAY DIFFRACTION 2.40Å

e3dxoA1[A:1-117] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

uncharacterized SnoaL-like Protein ; ligands: PEG,PGE ; X-RAY DIFFRACTION 2.70Å

e2k54A1[A:1-123] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein Atu0742 ; SOLUTION NMR

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