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

X: Rossmann-like

X: C-terminal domain in CAC2185-like proteins

X: P-loop domains-like

X: EreA/ChaN-like

X: HUP domain-like

X: HAD domain-like

X: Flavodoxin-like

X: Nucleic acid-binding domain of nonstructural protein 3

X: EDD domain

X: Phosphorylase/hydrolase-like

X: LigB-like

X: Other Rossmann-like structures with the crossover

X: N-terminal domain in NTD biosynthesis operon protein NtdA

X: Flavivirus non-structural protein 1 (NS1) a/b domain

X: STT3/PglB/AglB core domain

X: C-terminal domain in arabinosyltransferase C

X: Nqo1 FMN-binding domain-like

X: beta-carbonic anhydrase-like

X: a/b domain in QueA-like proteins (Pfam 02547)

X: a/b domain in AF0625-like proteins

X: CbiG linker domain

X: CobE/CbiG C-terminal domain-like

X: a/b domain in CV3147-like proteins

X: alpha/beta knot

X: Peptidyl-tRNA hydrolase II

X: Subtilisin-like

X: Insert domain in hypothetical protein PF0380

X: a/b domain in flagellar biosynthesis protein flhA

X: a/b domain in family 98 glycoside hydrolases

X: UPF0302 protein BA_1542/GBAA1542/BAS1430

X: Cellulose Synthase Subunit B a/b domain

X: Core protein P7

X: Type III R-M system modification subunit C-terminal domain

X: Restriction endonuclease-like

X: ClpP/crotonase

X: The "swivelling" beta/beta/alpha domains

X: Barstar (barnase inhibitor)

X: Ribosomal protein L13/L15p/L18e/L32e

X: C-terminal subdomain in Lon-related proteases catalytic domains

X: Atg7 N-terminal domain-like

X: MurF and HprK N-domain-like

X: DTD-like

X: Cell-division inhibitor MinC, N-terminal domain

X: CRISPR-associated Csx3

X: SpoIIaa-like

X: Small protrusion domain in cytoplasmic polyhedrosis virus capsid shell protein

X: Polycomb protein Eed insertion domain

X: HSP90 C-terminal a/b domain

X: STING C-terminal domain

X: C-terminal domain of poxin

X: Glycerate kinase I (Pfam 02595) domain II

X: Dihydrofolate reductases

X: Anticodon-binding domain of Class II aaRS

X: TolB, N-terminal domain

X: ITPase-like

X: Kinesin-like protein KIF23 C-terminal domain

X: N-terminal domain of GerK3 germinant receptor

X: Glutaminase/Asparaginase C-terminal domain

X: O-glucosyltransferase rumi N-terminal domain

X: NIF3 (NGG1p interacting factor 3)-like

X: Isocitrate/Isopropylmalate dehydrogenase-like

X: Single-stranded-DNA-specific exonuclease RecJ C-terminal domain

X: UDP-Glycosyltransferase/glycogen phosphorylase

H: UDP-Glycosyltransferase/glycogen phosphorylase

T: UDP-Glycosyltransferase/glycogen phosphorylase

F: XG_FTase

F: O-FucT

F: Glyco_transf_5

F: Glyco_transf_52

F: MGDG_synth

F: PS_pyruv_trans

F: LpxB

F: Epimerase_2

F: Glyco_transf_9

F: Glyco_transf_10

F: PM0188

F: AGT

F: Glycos_transf_N

F: Glyco_transf_28

F: Glyco_transf_20

F: Glyco_transf_90

F: Sucrose_synth

F: FUT8_N_cat

F: FucT_N

F: Glyco_trans_1_4

F: Glyco_transf_4

F: A-2_8-polyST

F: Capsule_synth

F: Glyco_tran_28_C

F: Glycos_transf_1

F: UDPGT

F: Glyco_transf_41

F: WsaF_N

F: TreT_GT1

F: Glyco_trans_4_4

F: T4-Gluco-transf

F: EryCIII-like_C

F: NodZ

F: Glycogen_syn

F: Glyphos_transf

F: Phosphorylase

F: Asp1

F: EryCIII-like_N

F: WsaF_C

F: GumK_N

F: Glyco_transf_99

F: Glyco_transf_18

F: EarP

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.

Representatives:

e2vchA3[A:6-250] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYDROQUINONE GLUCOSYLTRANSFERASE ; ligands: EDO,UDP ; X-RAY DIFFRACTION 1.45Å

e2iw1A3[A:2-167] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

LIPOPOLYSACCHARIDE CORE BIOSYNTHESIS PROTEIN RFAG ; ligands: U2F ; X-RAY DIFFRACTION 1.500Å

e1jixA3[A:171-351] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DNA BETA-GLUCOSYLTRANSFERASE ; ligands: UDP ; X-RAY DIFFRACTION 1.65Å

e3hbmA1[A:1-142] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UDP-sugar hydrolase ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e3hbmA2[A:143-282] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UDP-sugar hydrolase ; ligands: SO4 ; X-RAY DIFFRACTION 1.8Å

e2c1xA3[A:7-250] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UDP-GLUCOSE FLAVONOID 3-O GLYCOSYLTRANSFERASE ; ligands: B3P,UDP ; X-RAY DIFFRACTION 1.9Å

e5gvvA2[A:295-406] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glycosyl transferase family 8 ; X-RAY DIFFRACTION 1.95Å

e2acvA3[A:3-249] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

triterpene UDP-glucosyl transferase UGT71G1 ; ligands: UDP ; X-RAY DIFFRACTION 2Å

e4pqgA1[A:1-69,A:196-306] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glycosyltransferase Gtf1 ; ligands: NAG,UDP ; X-RAY DIFFRACTION 2.00Å

e2pq6A3[A:8-273] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UDP-GLUCURONOSYL/UDP-GLUCOSYLTRANSFERASE ; X-RAY DIFFRACTION 2.1Å

e3qkwB2[B:-1-159] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Nucleotide sugar synthetase-like protein ; ligands: UDP ; X-RAY DIFFRACTION 2.10Å

e4w6qB1[B:154-330] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

glucosyltransferase ; ligands: SER,UDP ; X-RAY DIFFRACTION 2.7Å

e4w6qB2[B:-1-153] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

glucosyltransferase ; ligands: SER,UDP ; X-RAY DIFFRACTION 2.7Å

e4rapE2[E:94-207] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glycosyltransferase TibC ; X-RAY DIFFRACTION 2.881Å

e5e9tB2[B:253-447] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glycosyltransferase-stabilizing protein Gtf2 ; X-RAY DIFFRACTION 2.92Å

X: CofD-like

X: Ferredoxin reductase-like, C-terminal NADP-linked domain

X: Alkaline phosphatase-like

X: Nucleotide-diphospho-sugar transferases

X: Nucleoside hydrolase

X: PK C-terminal domain-like

X: ATP synthase (F1-ATPase), gamma subunit

X: CinA-like

X: B12-dependent dehydratase associated subunit

X: TK C-terminal domain-like

X: Periplasmic binding protein-like II

X: ALDH-like

X: Phosphoglycerate mutase-like

X: Initiation factor IF2/eIF5b, domain 3

X: SurE-like/CoA-transferase family III (CaiB/BaiF)

X: Phosphoglucomutase, first 3 domains

X: Macro domain-like

X: Replicase polyprotein 1a N-terminal macro-like domain

X: Carbamate kinase-like

X: Phosphoglycerate kinase domain 1

X: Phosphoglycerate kinase domain 2

X: Undecaprenyl diphosphate synthase

X: Dipeptide transport protein

X: GckA/TtuD-like domain 1

X: PTS IIb component

X: Hypothetical protein MT938 (MTH938)

X: Creatininase

X: Bacterial fluorinating enzyme, N-terminal domain

X: Molybdenum cofactor biosynthesis proteins

X: Aconitase iron-sulfur domain

X: Methylglyoxal synthase-like

X: Nucleoside phosphorylase/phosphoribosyltransferase catalytic domain

X: YchN-like

X: Glutaminase/Asparaginase N-terminal domain

X: Hypothetical protein TT1679

X: Methylesterase CheB, C-terminal domain

X: Indigoidine synthase A-like (Pfam 04227)

X: Tetrapyrrole methylase N-terminal domain

X: ComB-like

X: Amidase signature (AS) enzymes

X: Nicotinate mononucleotide:5,6-dimethylbenzimidazole phosphoribosyltransferase (CobT)

X: 2,3-Bisphosphoglycerate-independent phosphoglycerate mutase, substrate-binding domain

X: Alpha-2,3/8-sialyltransferase CstII-related

X: Fe-only hydrogenase

X: DNA polymerase III psi subunit

X: Glycerol-3-phosphate (1)-acyltransferase

X: Ribosomal protein L4

X: Ribose/Galactose isomerase RpiB/AlsB

X: Isochorismatase-like hydrolases

X: Thiamin pyrophosphokinase, catalytic domain

X: MCP/YpsA-related

X: Homo-oligomeric flavin-containing Cys decarboxylases, HFCD

X: Resolvase-like

X: HflX family GTPase N-terminal domain

X: LmbE-like

X: BRCT domain

X: Uracil-DNA glycosylase-like

X: MurD-like peptide ligases, peptide-binding domain

X: Formyltransferase

X: Phosphofructokinase C-terminal domain

X: PRTase-like

X: Thiamin diphosphate-binding fold (THDP-binding)

X: Caspase-like

X: Gingipain R extra N-terminal alpha/beta domain

X: PLP-dependent transferases

X: PhnH-like

X: alpha/beta-Hydrolases

X: RibA-like

X: Thiolase-like

X: Rossmann-like domain in CbiD

X: Rossmann-like domain in AF1104-like proteins

X: Rossmann-like domain in Acetyl-CoA synthetase-like proteins

X: Rossmann-like domains in Sec1/munc18-like proteins

X: Rossmann-like domain in prismane-like proteins

X: Rossmann-like domain in carbohydrate phosphatases

X: NadA-like/4-hydroxy-3-methylbut-2-enyl diphosphate reductase

X: YgbK-like

X: Middle domain in Argonaute homologs

X: Tetraacyldisaccharide 4'-kinase C-terminal domain

X: CARF (CRISPR-associated Rossmann fold) domains

X: Peroxisome assembly protein 22

X: Hydrogenase expression/formation protein HypD

X: B12 binding domain in carbon monoxide dehydrogenase corrinoid/iron-sulfur protein gamma subunit

X: GT-D type glycosyltransferase

X: Endolysin C-terminal domain

X: Resistance protein Tm-1 first domain

X: UPF0246 protein YaaA

X: Chromo domain-containing protein 1 (Chp1) domain II

X: Lactate racemase N-terminal domain

X: Lactate racemase C-terminal domain

X: Immunomodulating metalloprotease IMPa N-terminal domain

X: a/b domain in Acetophenone carboxylase (Apc) alpha subunit

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

special