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

H: alpha/beta knot

T: alpha/beta knot

F: Ribo_biogen_C

F: SPOUT_MTase

F: Methyltrans_RNA

F: tRNA_m1G_MT

F: SFM1-like

F: SpoU_methylase

F: Methyltrn_RNA_3

F: EMG1

Representatives:

e2v3kA1[A:25-251] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ESSENTIAL FOR MITOTIC GROWTH 1 ; ligands: SAM,SO4 ; X-RAY DIFFRACTION 2.0Å

e3bbdA1[A:2-205] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME BIOGENESIS PROTEIN NEP1-LIKE ; ligands: GOL,SAH ; X-RAY DIFFRACTION 2.15Å

e3bbhA1[A:2-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME BIOGENESIS PROTEIN NEP1-LIKE ; ligands: GOL,SFG ; X-RAY DIFFRACTION 2.25Å

e3bbhB1[B:2-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME BIOGENESIS PROTEIN NEP1-LIKE ; ligands: GOL,SFG ; X-RAY DIFFRACTION 2.25Å

e3bbeB1[B:2-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME BIOGENESIS PROTEIN NEP1-LIKE ; ligands: GOL ; X-RAY DIFFRACTION 2.2Å

e3bbdB1[B:2-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME BIOGENESIS PROTEIN NEP1-LIKE ; ligands: GOL,SAH ; X-RAY DIFFRACTION 2.15Å

e3bbeA1[A:2-205] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME BIOGENESIS PROTEIN NEP1-LIKE ; ligands: GOL ; X-RAY DIFFRACTION 2.2Å

e2v3jA1[A:25-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ESSENTIAL FOR MITOTIC GROWTH 1 ; ligands: SO4 ; X-RAY DIFFRACTION 2.0Å

e3o7bA1[A:1-216] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosome biogenesis Nep1 RNA methyltransferase ; ligands: SAH,TYR ; X-RAY DIFFRACTION 1.450Å

e3oiiA1[A:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Essential for mitotic growth 1 ; ligands: GOL,SAH ; X-RAY DIFFRACTION 1.800Å

e3oiiB1[B:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Essential for mitotic growth 1 ; ligands: SAH ; X-RAY DIFFRACTION 1.800Å

e3oijA1[A:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Essential for mitotic growth 1 ; ligands: SAH ; X-RAY DIFFRACTION 2.900Å

e3oijB1[B:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Essential for mitotic growth 1 ; ligands: SAH ; X-RAY DIFFRACTION 2.900Å

e3oinA1[A:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ligands: GOL ; X-RAY DIFFRACTION 1.900Å

e3oinB1[B:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ligands: SAH,SCY ; X-RAY DIFFRACTION 1.900Å

e5faiA1[A:36-244] Image Pymol Jmol Links: PDB, SCOP, CATH

Ribosomal RNA small subunit methyltransferase NEP1 ; ligands: CIT,SAH,UNX ; X-RAY DIFFRACTION 1.800Å

e5jpqe1[e:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e5jpqf1[f:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e5tzsj1[j:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e5tzsk1[k:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e5wyjE11[E1:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e5wyjE21[E2:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e5wykE11[E1:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e5wykE21[E2:28-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e5wlcSJ1[SJ:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e5wlcSK1[SK:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e5oqle1[e:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e5oqlf1[f:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxtCN1[CN:12-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxtCO1[CO:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxuCN1[CN:12-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxuCO1[CO:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxvCN1[CN:12-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxvCO1[CO:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxxCN1[CN:12-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxxCO1[CO:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxyCN1[CN:12-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxyCO1[CO:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxzCN1[CN:12-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6rxzCO1[CO:24-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Emg1 ; ELECTRON MICROSCOPY

e6ke6RH1[RH:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6ke6RG1[RG:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqpRG1[RG:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqpRH1[RH:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqqRG1[RG:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqqRH1[RH:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqrRG1[RG:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqrRH1[RH:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqsRG1[RG:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqsRH1[RH:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqtRH1[RH:27-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lquRG1[RG:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lquRH1[RH:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqvRG1[RG:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6lqvRH1[RH:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqaJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqaJG1[JG:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqbJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqbJG1[JG:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqcJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqcJG1[JG:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqdJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqdJG1[JG:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqeJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqeJG1[JG:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqfJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqfJG1[JG:25-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqgJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e6zqgJG1[JG:25-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e7ajtJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e7ajtJG1[JG:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e7ajuJF1[JF:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e7ajuJG1[JG:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e7sukSJ1[SJ:29-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

e7sukSK1[SK:16-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal RNA small subunit methyltransferase NEP1 ; ELECTRON MICROSCOPY

F: SpoU_methylase,SpoU_methylas_C

F: Trm56

F: Methyltrn_RNA_4

F: Methyltrn_RNA_2

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.

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

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