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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

X: Periplasmic binding protein-like II
H: Periplasmic binding protein-like II
T: Periplasmic binding protein-like II
F: Lipoprotein_9

PF03180 CL0177

Representatives:

e1p99A2[A:119-236] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hypothetical protein PG110 ; ligands: GLY,MET ; X-RAY DIFFRACTION 1.7Å

e1p99A3[A:40-118,A:237-294] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hypothetical protein PG110 ; ligands: GLY,MET ; X-RAY DIFFRACTION 1.7Å

e1xs5A2[A:5-86,A:201-244] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Membrane lipoprotein TpN32 ; ligands: MET ; X-RAY DIFFRACTION 1.85Å

e4ef1A2[A:28-109,A:228-272] Image Pymol Jmol Links: PDB, SCOP, CATH

Pheromone cOB1/lipoprotein, YaeC family ; ligands: MSE ; X-RAY DIFFRACTION 1.90Å

e4ef1B1[B:28-109,B:228-272] Image Pymol Jmol Links: PDB, SCOP, CATH

Pheromone cOB1/lipoprotein, YaeC family ; ligands: MSE ; X-RAY DIFFRACTION 1.90Å

e4ef2A2[A:28-109,A:228-270] Image Pymol Jmol Links: PDB, SCOP, CATH

Pheromone cOB1/lipoprotein, YaeC family ; ligands: CL,MSE,PEG,PGE ; X-RAY DIFFRACTION 2.10Å

e4ef2B1[B:30-109,B:228-270] Image Pymol Jmol Links: PDB, SCOP, CATH

Pheromone cOB1/lipoprotein, YaeC family ; ligands: MSE,PE8,PGE ; X-RAY DIFFRACTION 2.10Å

e4gotA1[A:28-111,A:230-274] Image Pymol Jmol Links: PDB, SCOP, CATH

Methionine-binding lipoprotein metQ ; ligands: MSE,SO4 ; X-RAY DIFFRACTION 1.95Å

e3gxaA1[A:43-123,A:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Outer membrane lipoprotein GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.25Å

e3gxaB2[B:43-123,B:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Outer membrane lipoprotein GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.25Å

e3gxaD1[D:43-123,D:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Outer membrane lipoprotein GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.25Å

e3gxaE1[E:43-123,E:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Outer membrane lipoprotein GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.25Å

e3gxaF2[F:43-123,F:237-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Outer membrane lipoprotein GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.25Å

e4ib2A1[A:32-116,A:235-278] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative Lipoprotein ; ligands: CL,GOL,MET ; X-RAY DIFFRACTION 1.76Å

e4ib2B1[B:36-116,B:235-278] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative Lipoprotein ; ligands: CL,GOL,MET ; X-RAY DIFFRACTION 1.76Å

e3ir1A2[A:43-123,A:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OUTER MEMBRANE LIPOPROTEIN GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.15Å

e3ir1B1[B:43-123,B:237-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OUTER MEMBRANE LIPOPROTEIN GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.15Å

e3ir1C1[C:43-123,C:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OUTER MEMBRANE LIPOPROTEIN GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.15Å

e3ir1D1[D:43-123,D:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OUTER MEMBRANE LIPOPROTEIN GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.15Å

e3ir1E1[E:43-123,E:237-281] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OUTER MEMBRANE LIPOPROTEIN GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.15Å

e3ir1F2[F:43-123,F:237-286] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

OUTER MEMBRANE LIPOPROTEIN GNA1946 ; ligands: MET,SO4 ; X-RAY DIFFRACTION 2.15Å

e3k2dA2[A:26-111,A:226-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ABC-type metal ion transport system, periplasmic component ; ligands: MET ; X-RAY DIFFRACTION 2.6Å

e3k2dB1[B:33-111,B:226-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ABC-type metal ion transport system, periplasmic component ; ligands: MET ; X-RAY DIFFRACTION 2.6Å

e4k3fA1[A:0-102,A:217-260] Image Pymol Jmol Links: PDB, SCOP, CATH

Probable TonB-dependent receptor ; ligands: CL,GOL,MSE ; X-RAY DIFFRACTION 1.60Å

e4ntlA2[A:31-111,A:228-272] Image Pymol Jmol Links: PDB, SCOP, CATH

Lipoprotein, YaeC family ; ligands: EDO,ZN ; X-RAY DIFFRACTION 1.799Å

e3up9A2[A:37-119,A:233-277] Image Pymol Jmol Links: PDB, SCOP, CATH

Putative uncharacterized protein ; ligands: MSE,PE4,PG4 ; X-RAY DIFFRACTION 2.35Å

e4oteA2[A:28-108,A:222-265] Image Pymol Jmol Links: PDB, SCOP, CATH

Lipoprotein ; ligands: ACT,CL,MSE,ZN ; X-RAY DIFFRACTION 2.20Å

e4oteB1[B:26-108,B:222-265] Image Pymol Jmol Links: PDB, SCOP, CATH

Lipoprotein ; ligands: ACT,CL,GOL,MSE,ZN ; X-RAY DIFFRACTION 2.20Å

e4qhqA2[A:31-110,A:228-271] Image Pymol Jmol Links: PDB, SCOP, CATH

LIPOPROTEIN ; ligands: MET,PEG ; X-RAY DIFFRACTION 1.4Å

e1xs5A3[A:87-200] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Membrane lipoprotein TpN32 ; ligands: MET ; X-RAY DIFFRACTION 1.85Å

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.

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