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
looks like an elaborated ferredoxin
contains a HTH motif
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
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