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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

X: RuvA-C
H: Hypothetical protein AF0491, middle domain
T: Hypothetical protein AF0491, middle domain
F: SBDS_domain_II

PF09377 CL0437

Representatives:

e1t95A1[A:87-161] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HYPOTHETICAL PROTEIN AF0491 ; X-RAY DIFFRACTION 1.9Å

e2wbmA1[A:82-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME MATURATION PROTEIN SDO1 HOMOLOG ; X-RAY DIFFRACTION 1.75Å

e2kdoA2[A:92-165] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosome maturation protein SBDS ; SOLUTION NMR

e1p9qC1[C:87-155] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hypothetical protein AF0491 ; X-RAY DIFFRACTION 2.000Å

e2wbmB1[B:82-156] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME MATURATION PROTEIN SDO1 HOMOLOG ; ligands: CL,SO4 ; X-RAY DIFFRACTION 1.75Å

e2l9nA1[A:90-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME MATURATION PROTEIN SBDS ; SOLUTION NMR

e5an9J2[J:90-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME MATURATION PROTEIN SBDS ; ELECTRON MICROSCOPY

e5anbJ1[J:90-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME MATURATION PROTEIN SBDS ; ELECTRON MICROSCOPY

e5ancJ1[J:90-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RIBOSOME MATURATION PROTEIN SBDS ; ELECTRON MICROSCOPY

e6fswA1[A:88-162] Image Pymol Jmol Links: PDB, SCOP, CATHDOI

Ribosome maturation protein SDO1-like protein ; X-RAY DIFFRACTION 1.73Å

e6qklJ2[J:90-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosome maturation protein SBDS ; ELECTRON MICROSCOPY

e6skgBp3[Bp:87-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Predicted exosome subunit, UPF0023 family ; ELECTRON MICROSCOPY

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

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