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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

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

X: Crambin-like
H: Crambin-like
T: Crambin-like
F: Thionin

PF00321

Representatives:

e1ejgA1[A:1-46] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN (PRO22,SER22/LEU25,ILE25) ; X-RAY DIFFRACTION 0.540Å

e1wuwA1[A:1-45] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Beta-hordothionin ; ligands: SER,TSU ; X-RAY DIFFRACTION 1.9Å

e1yvaA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crambin ; SOLUTION NMR

e1cnrA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

CRAMBIN ; ligands: EOH ; X-RAY DIFFRACTION

e2eydA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; SOLUTION NMR

e1crnA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; X-RAY DIFFRACTION

e1ccnA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; SOLUTION NMR

e2eyaA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crambin ; SOLUTION NMR

e2eycA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; SOLUTION NMR

e2fd7A1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; X-RAY DIFFRACTION 1.75Å

e1ccmA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; SOLUTION NMR

e2fd9A1[A:1-43] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; X-RAY DIFFRACTION 1.6Å

e1ab1A1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN (SER22/ILE25) ; ligands: EOH ; X-RAY DIFFRACTION 0.89Å

e1cxrA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; SOLUTION NMR

e2eybA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; SOLUTION NMR

e1yv8A1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; SOLUTION NMR

e1jmnA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH

viscotoxin A2 ; SOLUTION NMR

e1ed0A1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN A3 ; SOLUTION NMR

e1jmpA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

viscotoxin B ; SOLUTION NMR

e1wuwB1[B:51-95] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Beta-hordothionin ; ligands: SER,TSU ; X-RAY DIFFRACTION 1.9Å

e1bhpA1[A:1-45] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BETA-PUROTHIONIN ; ligands: ACT,GOL,PO4 ; X-RAY DIFFRACTION 1.7Å

e2plhA1[A:1-45] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ALPHA-1-PUROTHIONIN ; ligands: ACT,GOL,PO4,SBT ; X-RAY DIFFRACTION 2.5Å

e1okhB1[B:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN A3 ; ligands: PO4 ; X-RAY DIFFRACTION 1.750Å

e1orlA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN C1 ; SOLUTION NMR

e1nblA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hellethionin D ; SOLUTION NMR

e1okhA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN A3 ; ligands: PO4,SO4 ; X-RAY DIFFRACTION 1.750Å

e3ue7B1[B:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; X-RAY DIFFRACTION 1.08Å

e2v9bA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN-B ; ligands: SO4 ; X-RAY DIFFRACTION 1.15Å

e3c8pA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN A1 ; X-RAY DIFFRACTION 1.25Å

e3nirA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crambin ; ligands: EOH ; X-RAY DIFFRACTION 0.48Å

e2v9bB1[B:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN-B ; ligands: SO4 ; X-RAY DIFFRACTION 1.15Å

e3c8pB1[B:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

VISCOTOXIN A1 ; X-RAY DIFFRACTION 1.25Å

e4fc1A1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Crambin ; NEUTRON DIFFRACTION 1.100Å

e3szsA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH

Hellethionin-D ; ligands: CL,NA ; X-RAY DIFFRACTION 1.950Å

e3szsD1[D:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH

Hellethionin-D ; ligands: CL,NA ; X-RAY DIFFRACTION 1.950Å

e3szsE1[E:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH

Hellethionin-D ; ligands: CL,NA ; X-RAY DIFFRACTION 1.950Å

e3szsG1[G:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH

Hellethionin-D ; ligands: CL,NA ; X-RAY DIFFRACTION 1.950Å

e3szsC1[C:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH

Hellethionin-D ; ligands: CL ; X-RAY DIFFRACTION 1.950Å

e3szsF1[F:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH

Hellethionin-D ; ligands: CL,NA ; X-RAY DIFFRACTION 1.950Å

e3szsB1[B:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH

Hellethionin-D ; ligands: CL,NA ; X-RAY DIFFRACTION 1.950Å

e1cbnA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; ligands: EOH ; X-RAY DIFFRACTION

e1jxtA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; ligands: EOH ; X-RAY DIFFRACTION 0.89Å

e1jxuA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; ligands: EOH ; X-RAY DIFFRACTION 0.99Å

e1jxwA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; ligands: EOH ; X-RAY DIFFRACTION 0.89Å

e1jxxA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; ligands: EOH ; X-RAY DIFFRACTION 0.89Å

e1jxyA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; ligands: EOH ; X-RAY DIFFRACTION 0.89Å

e3u7tA1[A:1-46] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRAMBIN ; X-RAY DIFFRACTION 0.85Å

e7s7pA1[A:1-42] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

urthionin-Uf1a ; SOLUTION NMR

X: Rubredoxin-like

binds one zinc with two CxxC motifs on two beta-hairpins

X: RING/U-box-like

binds two zincs. one in the same way as rubredoxin, probably related to rubredoxin. the other in a similar way as glucocorticoid receptor

X: Glucocorticoid receptor-like

binds zinc with one beta-hairpin and one helix, the helix binds DNA

extended segmentsextended, non-globular segments, frequently bind to other proteins to form complexes