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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: HTH
H: HTH
T: tri-helical
F: Ribosomal_S18

PF01084 CL0123

Representatives:

e2uubR1[R:19-88] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

30S RIBOSOMAL PROTEIN S18 ; X-RAY DIFFRACTION 2.800Å

e3j6vR1[R:39-196] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e3j9mAO1[AO:52-236] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

mS40 (bS18b) ; ligands: ZN ; ELECTRON MICROSCOPY

e6nu2AO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6nu3AO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6vmiAO1[AO:49-238] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6zs9AO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6zsaAO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6zsbAO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6zscAO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6zsdAO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6zseAO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e6zsgAO1[AO:52-236] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: ZN ; ELECTRON MICROSCOPY

e7qi6AO1[AO:47-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: VAL,ZN ; ELECTRON MICROSCOPY

e8oirAO1[AO:47-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: MET,VAL,ZN ; ELECTRON MICROSCOPY

e7qi5AO1[AO:47-239] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

28S ribosomal protein S18b, mitochondrial ; ligands: VAL,ZN ; ELECTRON MICROSCOPY

e8anyAO1[AO:47-239] Image Pymol Jmol Links: PDB, SCOP, CATH

28S ribosomal protein S18b, mitochondrial ; ligands: VAL,ZN ; ELECTRON MICROSCOPY

e3j9mAP1[AP:47-142] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

bS18m (bS18c) ; ligands: ZN ; ELECTRON MICROSCOPY

e5aj3p1[p:51-238] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MITORIBOSOMAL PROTEIN MS40, MRPS18B ; ligands: ZN ; ELECTRON MICROSCOPY

e5aj3R1[R:47-143] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MITORIBOSOMAL PROTEIN BS18M, MRPS18C ; ligands: ZN ; 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.

T: DNA-binding domain of intron-encoded endonucleases

lacks the N-terminal helix, circularly permuted wing

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