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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: Alpha-beta plaits
H: Alpha subunit of glutamate synthase, insertion domain
T: Alpha subunit of glutamate synthase, insertion domain
F: GATase_2

PF00310 CL0052

Representatives:

e1ofdA1[A:67-170] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERREDOXIN-DEPENDENT GLUTAMATE SYNTHASE 2 ; X-RAY DIFFRACTION 2.0Å

e1ea0A1[A:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; X-RAY DIFFRACTION 3.0Å

e1llwA1[A:66-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERREDOXIN-DEPENDENT GLUTAMATE SYNTHASE ; X-RAY DIFFRACTION 2.7Å

e1ea0B1[B:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; X-RAY DIFFRACTION 3.0Å

e2vdcA1[A:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; ELECTRON MICROSCOPY

e2vdcB1[B:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; ELECTRON MICROSCOPY

e2vdcC1[C:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; ELECTRON MICROSCOPY

e2vdcD1[D:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; ELECTRON MICROSCOPY

e2vdcE1[E:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; ELECTRON MICROSCOPY

e2vdcF1[F:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTAMATE SYNTHASE [NADPH] LARGE CHAIN ; ELECTRON MICROSCOPY

e1llzA1[A:66-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERREDOXIN-DEPENDENT GLUTAMATE SYNTHASE ; X-RAY DIFFRACTION 3.0Å

e1lm1A1[A:66-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERREDOXIN-DEPENDENT GLUTAMATE SYNTHASE ; X-RAY DIFFRACTION 2.8Å

e1ofdB1[B:66-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERREDOXIN-DEPENDENT GLUTAMATE SYNTHASE 2 ; X-RAY DIFFRACTION 2.0Å

e1ofeA1[A:66-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERREDOXIN-DEPENDENT GLUTAMATE SYNTHASE 2 ; X-RAY DIFFRACTION 2.45Å

e1ofeB1[B:66-169] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

FERREDOXIN-DEPENDENT GLUTAMATE SYNTHASE 2 ; X-RAY DIFFRACTION 2.45Å

e6s6sA5[A:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6sB3[B:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6sC3[C:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6sD1[D:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6tA5[A:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6tB5[B:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6tC4[C:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6tD3[D:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6uA3[A:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6uB3[B:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6uC1[C:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6uD4[D:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6uE1[E:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6uF2[F:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6xA4[A:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6xB2[B:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6xC1[C:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6xD5[D:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6xE1[E:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e6s6xF3[F:66-173] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase [NADPH] large chain ; ELECTRON MICROSCOPY

e7mfmG5[G:78-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase (NADPH) large chain ; ELECTRON MICROSCOPY

e7mfmH5[H:78-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase (NADPH) large chain ; ELECTRON MICROSCOPY

e7mftG5[G:78-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutamate synthase (NADPH) large chain ; ELECTRON MICROSCOPY

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

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