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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

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

X: Lipocalins/Streptavidin
H: Lipocalins
T: Lipocalins
F: Lipocalin

PF00061 CL0116

Representatives:

e1i4uA1[A:1-181] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRUSTACYANIN ; ligands: MPD,SO4 ; X-RAY DIFFRACTION 1.10Å

e1lf7A1[A:10-180] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Complement Protein C8gamma ; ligands: CIT ; X-RAY DIFFRACTION 1.2Å

e1kt7A1[A:1-175] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PLASMA RETINOL-BINDING PROTEIN ; ligands: RTL ; X-RAY DIFFRACTION 1.27Å

e2fs6A1[A:2-137] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Cellular retinoic acid-binding protein 2 ; ligands: ACT,NA ; X-RAY DIFFRACTION 1.350Å

e1dzkA1[A:10-157] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ODORANT-BINDING PROTEIN ; ligands: PRZ ; X-RAY DIFFRACTION 1.48Å

e2hnxA1[A:1-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Fatty acid-binding protein, adipocyte ; ligands: ACY,PLM,PO4 ; X-RAY DIFFRACTION 1.5Å

e1zndA1[A:1-157] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MAJOR URINARY PROTEIN ; ligands: CD,PE9 ; X-RAY DIFFRACTION 1.6Å

e1e5pA1[A:3-151] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

APHRODISIN ; X-RAY DIFFRACTION 1.600Å

e1bebA1[A:5-160] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BETA-LACTOGLOBULIN ; X-RAY DIFFRACTION 1.8Å

e1bj7A1[A:7-156] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

D 2 ; X-RAY DIFFRACTION 1.8Å

e1kxoA1[A:1-171] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DigA16 ; X-RAY DIFFRACTION 1.8Å

e1xkiA1[A:12-150] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Von Ebner's gland protein ; ligands: CL,ZN ; X-RAY DIFFRACTION 1.8Å

e1vyfA1[A:-1-133] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

14 KDA FATTY ACID BINDING PROTEIN ; ligands: OLA ; X-RAY DIFFRACTION 1.85Å

e1x71A1[A:4-177] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Neutrophil gelatinase-associated lipocalin ; ligands: DB1,FE ; X-RAY DIFFRACTION 2.1Å

e1z24A1[A:1-189] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

Insecticyanin A form ; ligands: BLV ; X-RAY DIFFRACTION 2.6Å

e1gkaB1[B:1-174] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CRUSTACYANIN A2 SUBUNIT ; ligands: AXT,D12,EPE,TRS ; X-RAY DIFFRACTION 3.23Å

e1epbA1[A:3-162] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

EPIDIDYMAL RETINOIC ACID-BINDING PROTEIN ; ligands: REA ; X-RAY DIFFRACTION

e1ifcA1[A:1-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,

INTESTINAL FATTY ACID BINDING PROTEIN ; X-RAY DIFFRACTION

e1jzuA1[A:1-157] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

lipocalin Q83 ; SOLUTION NMR

e1mdcA1[A:0-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INSECT FATTY ACID BINDING PROTEIN ; ligands: PLM,SO4 ; X-RAY DIFFRACTION

e1opaA1[A:1-133] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

CELLULAR RETINOL BINDING PROTEIN II ; X-RAY DIFFRACTION

e2a0aA1[A:1-131] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Der f 13 ; SOLUTION NMR

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.

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

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