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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

X: cradle loop barrel

Refs: Structure 14, 1489-1498; Current opinion in structural biology 18, 358-365

X: Ribosomal protein L21p
H: Ribosomal protein L21p
T: Ribosomal protein L21p
F: Ribosomal_L21p

PF00829

Representatives:

e2j01V1[V:1-101] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e4v19V1[V:55-209] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MITORIBOSOMAL PROTEIN BL21M, MRPL21 ; ELECTRON MICROSCOPY

e8oiqBZ1[BZ:55-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

; ELECTRON MICROSCOPY

e3bboT1[T:123-226] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e4ce4V1[V:99-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MRPL21 ; ELECTRON MICROSCOPY

e1vw4N1[N:44-161] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

; ligands: MG

e3j6bN1[N:44-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

54S ribosomal protein L49, mitochondrial ; ligands: MG ; ELECTRON MICROSCOPY

e3j7yS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

bL21 ; ELECTRON MICROSCOPY

e3j9mS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

bL21m ; ELECTRON MICROSCOPY

e4v61BT1[BT:123-226] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Ribosomal Protein L21 ; ELECTRON MICROSCOPY

e5aj4BV1[BV:55-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MITORIBOSOMAL PROTEIN BL21M, MRPL21 ; ELECTRON MICROSCOPY

e5mlcT1[T:123-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

50S ribosomal protein L21, chloroplastic ; ELECTRON MICROSCOPY

e5h1sT1[T:88-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

50S ribosomal protein L21, chloroplastic ; ELECTRON MICROSCOPY

e5mrcN1[N:44-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

bL21m ; ligands: MG ; ELECTRON MICROSCOPY

e5mreN1[N:44-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

bL21m ; ligands: MG ; ELECTRON MICROSCOPY

e5mrfN1[N:44-161] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

bL21m ; ligands: MG ; ELECTRON MICROSCOPY

e5mmmS1[S:68-237] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

50S ribosomal protein L21, chloroplastic ; ligands: MG ; ELECTRON MICROSCOPY

e5x8tS1[S:88-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

50S ribosomal protein L21, chloroplastic ; ELECTRON MICROSCOPY

e5x8pS1[S:88-234] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

50S ribosomal protein L21, chloroplastic ; ELECTRON MICROSCOPY

e5oolS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e5oomS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e6gb2BV1[BV:55-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mitochondrial ribosomal protein L21 ; ligands: 5GP ; ELECTRON MICROSCOPY

e6gawBV1[BV:55-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mitochondrial ribosomal protein L21 ; ligands: 5GP ; ELECTRON MICROSCOPY

e6ydpBV1[BV:55-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mitochondrial ribosomal protein L21 ; ligands: 5GP ; ELECTRON MICROSCOPY

e6ydwBV1[BV:55-209] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mitochondrial ribosomal protein L21 ; ligands: 5GP ; ELECTRON MICROSCOPY

e7oi7S1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oi8S1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oi9S1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oiaS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oibS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oicS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oidS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oieS1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7oi6S1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

e7pd3S1[S:49-204] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

39S ribosomal protein L21, mitochondrial ; ELECTRON MICROSCOPY

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