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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: RNA-binding domain, RBD
T: RNA-binding domain, RBD
F: ACT_4

PF13291 CL0070

Representatives:

e5iqr85[8:664-740] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GTP pyrophosphokinase ; ELECTRON MICROSCOPY

e5l3pz3[z:663-740] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GTP pyrophosphokinase,GTP pyrophosphokinase,GTP pyrophosphokinase ; ELECTRON MICROSCOPY

e5kpsA1[A:663-742] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GTP pyrophosphokinase ; ELECTRON MICROSCOPY

e5kpv334[33:664-742] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GTP pyrophosphokinase ; ELECTRON MICROSCOPY

e5kpw333[33:664-742] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GTP pyrophosphokinase ; ELECTRON MICROSCOPY

e5kpx331[33:664-742] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GTP pyrophosphokinase ; ELECTRON MICROSCOPY

e8fr8I1[I:716-794] Image Pymol Jmol Links: PDB, SCOP, CATH

GTP pyrophosphokinase RelA ; ELECTRON MICROSCOPY

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.

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