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
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




Representatives:
e1dmgA1[A:2-42,A:96-226]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
RIBOSOMAL PROTEIN L4 ; ligands: CIT ; X-RAY DIFFRACTION 1.7Å
e1vqoC1[C:1-246]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.2Å
e1qvgC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.8Å
e1n8rE1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 3.00Å
e1vq4C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.7Å
e1kc8E1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 3.01Å
e1s72C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.400Å
e1q86E1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION
e1kqsC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed,
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 3.1Å
e1q81E1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION
e1yi2C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.65Å
e1vq9C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.4Å
e1yitC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.8Å
e1vq7C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.500Å
e1vq8C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.2Å
e1yhqC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.40Å
e2b66F1[F:1-168,F:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e1yjnC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 3.00Å
e1ffkC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; X-RAY DIFFRACTION 2.4Å
e1vqmC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.3Å
e1jj2C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 2.4Å
e1vq5C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.6Å
e2b9nF1[F:1-168,F:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e1yijC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.60Å
e2otlC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4P ; ligands: MG,NA ; X-RAY DIFFRACTION 2.70Å
e1vqpC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA,SR ; X-RAY DIFFRACTION 2.25Å
e1yj9C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.90Å
e1q82E1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION
e1vqkC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA,SR ; X-RAY DIFFRACTION 2.3Å
e1vq6C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.7Å
e1qvfC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 3.1Å
e2qa4C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4P ; ligands: MG,NA ; X-RAY DIFFRACTION 3.0Å
e1vqnC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 2.4Å
e1vqlC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA,SR ; X-RAY DIFFRACTION 2.3Å
e1q7yE1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4E ; ligands: MG,NA ; X-RAY DIFFRACTION
e1k73E1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 3.01Å
e1njiE1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 3.0Å
e2qexC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4P ; ligands: MG,NA ; X-RAY DIFFRACTION 2.800Å
e1kd1E1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA,SPR ; X-RAY DIFFRACTION 3.0Å
e2b9pF1[F:1-168,F:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e1yjwC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4E ; ligands: MG,NA ; X-RAY DIFFRACTION 3.000Å
e1yl3F1[F:1-168,F:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e1m1kE1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 3.2Å
e1k8aE1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 3.0Å
e1m90E1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 2.8Å
e2otjC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4P ; ligands: MG,NA ; X-RAY DIFFRACTION 2.850Å
e1k9mE1[E:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 3.0Å
e3cxcC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
RIBOSOMAL PROTEIN L4 ; ligands: MG,NA ; X-RAY DIFFRACTION 3.0Å
e3ow2C1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH
50S RIBOSOMAL PROTEIN L4P ; ligands: MG,NA ; X-RAY DIFFRACTION 2.7Å
e3j21D1[D:1-255] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e1w2bC1[C:1-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4P ; ligands: MG,NA ; X-RAY DIFFRACTION 3.500Å
e1giyF1[F:1-168,F:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e1ml5f1[f:1-168,f:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4 ; ELECTRON MICROSCOPY
e3j44D1[D:1-255] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e4v42BF1[BF:1-168,BF:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S RIBOSOMAL PROTEIN L4 ; X-RAY DIFFRACTION 5.0Å
e4v4nAD1[AD:1-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4P ; ELECTRON MICROSCOPY
e4v4pAF1[AF:1-168,AF:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; X-RAY DIFFRACTION 5.50Å
e4v4rBF1[BF:1-168,BF:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; X-RAY DIFFRACTION 5.9Å
e4v4sBF1[BF:1-168,BF:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; X-RAY DIFFRACTION 6.76Å
e4v4tBF1[BF:1-168,BF:193-246] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; X-RAY DIFFRACTION 6.46Å
e4v6uBD1[BD:1-255] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4P ; ELECTRON MICROSCOPY
e4wweD1[D:1-207] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e4wwtD1[D:1-207] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB
e4wpoAF1[AF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.800Å
e4wpoCF1[CF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.800Å
e4wqfAF1[AF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.790Å
e4wqfCF1[CF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.790Å
e4wquAF1[AF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.800Å
e4wquCF1[CF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.800Å
e4wqyAF1[AF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.800Å
e4wqyCF1[CF:6-208] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
50S ribosomal protein L4 ; ligands: MG ; X-RAY DIFFRACTION 2.800Å
e4xejAL041[AL04:6-207] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
; X-RAY DIFFRACTION 3.8Å
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