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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: Alpha-lytic protease prodomain-like
H: BolA-like
T: BolA-like
F: BolA

PF01722

Representatives:

e1ny8A1[A:1-97] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Protein yrbA ; SOLUTION NMR

e3o2eA1[A:-2-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA-like protein ; ligands: IOD,MG ; X-RAY DIFFRACTION 1.950Å

e2kz0A1[A:1-76] Image Pymol Jmol Links: PDB, SCOP, CATH

BolA family protein ; SOLUTION NMR

e2dhmA1[A:1-107] Image Pymol Jmol Links: PDB, SCOP, CATH

PROTEIN BOLA ; SOLUTION NMR

e1xs3A1[A:10-89] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hypothetical protein XC975 ; SOLUTION NMR

e1v60A1[A:6-128] Image Pymol Jmol Links: PDB, SCOP, CATH

RIKEN cDNA 1810037G04 ; SOLUTION NMR

e3tr3B1[B:-1-79] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA ; ligands: CO ; X-RAY DIFFRACTION 2.450Å

e2mcqA1[A:1-77] Image Pymol Jmol Links: PDB, SCOP, CATH

Uncharacterized protein RP812 ; SOLUTION NMR

e3tr3A2[A:1-78] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA ; ligands: CO ; X-RAY DIFFRACTION 2.450Å

e2ma0A1[A:24-123] Image Pymol Jmol Links: PDB, SCOP, CATH

e2mmaB1[B:2-81] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA2 ; SOLUTION NMR

e4puiB1[B:277-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SufE-like protein, chloroplastic ; X-RAY DIFFRACTION 1.698Å

e2mm9A1[A:1-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA2 ; SOLUTION NMR

e4pugA1[A:64-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA like protein ; X-RAY DIFFRACTION 1.998Å

e4pugB1[B:65-157] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA like protein ; X-RAY DIFFRACTION 1.998Å

e4puiA1[A:277-371] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

SufE-like protein, chloroplastic ; X-RAY DIFFRACTION 1.698Å

e4puhA1[A:2-82] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

At5g09830 ; X-RAY DIFFRACTION 1.898Å

e4puhB1[B:2-82] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

At5g09830 ; X-RAY DIFFRACTION 1.898Å

e2n8qA1[A:24-123] Image Pymol Jmol Links: PDB, SCOP, CATH

Predicted protein ; SOLUTION NMR

e5lciA1[A:31-118] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA-like protein 1 ; SOLUTION NMR

e2nclA1[A:27-107] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA-like protein 3 ; SOLUTION NMR

e2kdnA1[A:1-108] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein PFE0790c ; SOLUTION NMR

e5y4bA1[A:36-128] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA-like protein 2 ; SOLUTION NMR

e5nfmA1[A:3-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

YrbA ; ligands: CU,LI ; X-RAY DIFFRACTION 0.80Å

e5zb6A1[A:24-123] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UVI31+ ; SOLUTION NMR

e5nfkA1[A:4-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

YrbA ; ligands: LI,NI ; X-RAY DIFFRACTION 0.98Å

e5nflA1[A:4-77] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

YrbA ; ligands: CO ; X-RAY DIFFRACTION 1.90Å

e1v9jA1[A:1-113] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

BolA-like protein RIKEN cDNA 1110025L05 ; SOLUTION NMR

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