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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: FKBP-like
H: Chitinase insertion domain
T: Chitinase insertion domain
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:

e1itxA1[A:338-409] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

GLYCOSYL HYDROLASE ; ligands: GOL ; X-RAY DIFFRACTION 1.1Å

e1e15A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; X-RAY DIFFRACTION 1.900Å

e3aroA3[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; X-RAY DIFFRACTION 2.22Å

e1e15B1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; X-RAY DIFFRACTION 1.900Å

e1e6nA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: SO4 ; X-RAY DIFFRACTION 2.25Å

e1e6nB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: SO4 ; X-RAY DIFFRACTION 2.25Å

e1e6pA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å

e1e6pB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.7Å

e1e6rA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: AMI,SO4 ; X-RAY DIFFRACTION 2.5Å

e1e6rB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: AMI,SO4 ; X-RAY DIFFRACTION 2.5Å

e1e6zA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: NAG,NGO ; X-RAY DIFFRACTION 1.990Å

e1e6zB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: NAG,NGO,SO4 ; X-RAY DIFFRACTION 1.990Å

e1goiB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.45Å

e1gpfA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; X-RAY DIFFRACTION 1.850Å

e1gpfB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; X-RAY DIFFRACTION 1.850Å

e1h0gA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; X-RAY DIFFRACTION 2.000Å

e1h0gB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; X-RAY DIFFRACTION 2.000Å

e1h0iA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: SO4 ; X-RAY DIFFRACTION 2.000Å

e1h0iB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.000Å

e1o6iA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase ; ligands: GOL ; X-RAY DIFFRACTION 1.700Å

e1o6iB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase ; ligands: GOL ; X-RAY DIFFRACTION 1.700Å

e1ogbA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.850Å

e1ogbB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL ; X-RAY DIFFRACTION 1.850Å

e1oggA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: AMI ; X-RAY DIFFRACTION 1.970Å

e1oggB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: AMI ; X-RAY DIFFRACTION 1.970Å

e1ur8A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GDL,GOL,NAG,SO4 ; X-RAY DIFFRACTION 1.900Å

e1ur8B1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GDL,GOL,NAG,SO4 ; X-RAY DIFFRACTION 1.900Å

e1ur9A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GDL,GOL,NAG,SO4 ; X-RAY DIFFRACTION 1.800Å

e1ur9B1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GDL,GOL,NAG,SO4 ; X-RAY DIFFRACTION 1.800Å

e1w1pA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL ; X-RAY DIFFRACTION 2.1Å

e1w1pB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 2.1Å

e1w1tA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL ; X-RAY DIFFRACTION 1.9Å

e1w1tB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL,SO4 ; X-RAY DIFFRACTION 1.9Å

e1w1vA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: ALJ,GOL,SO4 ; X-RAY DIFFRACTION 1.85Å

e1w1vB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: ALJ,GOL ; X-RAY DIFFRACTION 1.85Å

e1w1yA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: TYP ; X-RAY DIFFRACTION 1.85Å

e1w1yB1[B:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: TYP ; X-RAY DIFFRACTION 1.85Å

e3arpA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: DEQ ; X-RAY DIFFRACTION 1.55Å

e3arqA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: DM5 ; X-RAY DIFFRACTION 1.5Å

e3arrA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: PNX ; X-RAY DIFFRACTION 1.65Å

e3arsA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; X-RAY DIFFRACTION 2.45Å

e3artA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; X-RAY DIFFRACTION 2.23Å

e3aruA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: PNX ; X-RAY DIFFRACTION 1.9Å

e3arvA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: SAU ; X-RAY DIFFRACTION 1.5Å

e3arwA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: CTI ; X-RAY DIFFRACTION 1.5Å

e3arxA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: POY ; X-RAY DIFFRACTION 1.16Å

e3aryA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: I5I ; X-RAY DIFFRACTION 1.35Å

e3arzA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: I5I ; X-RAY DIFFRACTION 1.82Å

e3as0A2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: SAU ; X-RAY DIFFRACTION 2.0Å

e3as1A2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: CTI ; X-RAY DIFFRACTION 2.0Å

e3as2A2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: POY ; X-RAY DIFFRACTION 1.8Å

e3as3A2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; ligands: I5I ; X-RAY DIFFRACTION 2.4Å

e3b8sA3[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; X-RAY DIFFRACTION 2.0Å

e3b8sB2[B:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE A ; X-RAY DIFFRACTION 2.0Å

e3b9aA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase A ; X-RAY DIFFRACTION 1.80Å

e3b9dA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase A ; X-RAY DIFFRACTION 1.72Å

e3b9eA2[A:461-547] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase A ; X-RAY DIFFRACTION 1.70Å

e3wd0A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: DTD,GOL ; X-RAY DIFFRACTION 1.7Å

e3wd1A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: GOL,ST7 ; X-RAY DIFFRACTION 2.3Å

e3wd2A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: A1L,DTD,GOL ; X-RAY DIFFRACTION 2.2Å

e3wd3A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: A1L,GOL ; X-RAY DIFFRACTION 2.2Å

e3wd4A1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; ligands: A1L,GOL,QUB ; X-RAY DIFFRACTION 2.0Å

e4lgxA1[A:276-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glycoside hydrolase family 18 ; ligands: GOL ; X-RAY DIFFRACTION 1.49Å

e4nzcA1[A:276-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

Glycoside hydrolase family 18 ; ligands: GOL ; X-RAY DIFFRACTION 1.45Å

e3qokA4[A:276-371] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative chitinase II ; ligands: GOL ; X-RAY DIFFRACTION 2.600Å

e4ptmA2[A:276-371] Image Pymol Jmol Links: PDB, SCOP, CATH

Glycoside hydrolase family 18 ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å

e4q22A1[A:276-371] Image Pymol Jmol Links: PDB, SCOP, CATH

Glycoside hydrolase family 18 ; ligands: GOL ; X-RAY DIFFRACTION 1.93Å

e4z2gA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase B ; ligands: M6V ; X-RAY DIFFRACTION 2.60Å

e4z2hA2[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase B ; ligands: GOL,M6A ; X-RAY DIFFRACTION 2.35Å

e4z2iA2[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase B ; ligands: M6B,NA,PO3 ; X-RAY DIFFRACTION 2.00Å

e4z2jA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase B ; ligands: M6G ; X-RAY DIFFRACTION 2.60Å

e4z2kA1[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase B ; ligands: M6E ; X-RAY DIFFRACTION 2.30Å

e4z2lA3[A:292-379] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase B ; ligands: M6F ; X-RAY DIFFRACTION 2.30Å

e4w5uB2[B:305-364] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Chitinase ; X-RAY DIFFRACTION 2.770Å

e4w5uA1[A:305-364] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Chitinase ; X-RAY DIFFRACTION 2.770Å

e6kstB1[B:291-362] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Family 18 chitinase ; ligands: MXE,SO4 ; X-RAY DIFFRACTION 1.25Å

e7fbtA2[A:310-315,A:335-401] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase ; X-RAY DIFFRACTION 1.9Å

e1jndA1[A:279-370] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

IMAGINAL DISC GROWTH FACTOR-2 ; X-RAY DIFFRACTION 1.3Å

e1goiA1[A:292-379] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE B ; X-RAY DIFFRACTION 1.45Å

e1w9pA1[A:299-360] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE ; X-RAY DIFFRACTION 1.7Å

e1kfwA1[A:328-388] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

CHITINASE B ; X-RAY DIFFRACTION 1.74Å

e4txgA2[A:464-580] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Chitinase ; ligands: CS ; X-RAY DIFFRACTION 1.750Å

e4uriB2[B:236-293] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CHITINASE-RELATED AGGLUTININ ; ligands: MPD ; X-RAY DIFFRACTION 1.85Å

e3aquA2[A:233-298] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

AT4G19810 ; ligands: FLC ; X-RAY DIFFRACTION 2.01Å

e5gztB3[B:816-881] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase ; ligands: FMT ; X-RAY DIFFRACTION 2.10Å

e5gztB6[B:1305-1372] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase ; X-RAY DIFFRACTION 2.10Å

e3cz8A3[A:316-375] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Putative sporulation-specific glycosylase ydhD ; ligands: GOL ; X-RAY DIFFRACTION 2.150Å

e3bxwB2[B:280-336] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Chitinase domain-containing protein 1 ; X-RAY DIFFRACTION 2.700Å

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