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:
e1r0vA3[A:215-305] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-intron endonuclease ; X-RAY DIFFRACTION 2.0Å
e1a79A2[A:83-179] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRNA ENDONUCLEASE ; ligands: AU,SO4 ; X-RAY DIFFRACTION 2.28Å
e2zyzA1[A:1-93] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein PAE0789 ; X-RAY DIFFRACTION 1.7Å
e2zyzC2[C:1-96] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein PAE0789 ; X-RAY DIFFRACTION 1.7Å
e1a79C2[C:83-179] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRNA ENDONUCLEASE ; ligands: AU,SO4 ; X-RAY DIFFRACTION 2.28Å
e1a79B2[B:83-179] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRNA ENDONUCLEASE ; ligands: AU ; X-RAY DIFFRACTION 2.28Å
e1a79D2[D:83-179] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRNA ENDONUCLEASE ; ligands: AU ; X-RAY DIFFRACTION 2.28Å
e1rlvA4[A:215-305] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative tRNA-intron endonuclease ; X-RAY DIFFRACTION 3.0Å
e2gjwB4[B:217-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.85Å
e1r0vB3[B:215-305] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-intron endonuclease ; X-RAY DIFFRACTION 2.0Å
e1r0vD3[D:215-305] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-intron endonuclease ; X-RAY DIFFRACTION 2.0Å
e2gjwD4[D:218-308] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.85Å
e2gjwA4[A:218-308] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.85Å
e1r0vC3[C:215-305] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-intron endonuclease ; X-RAY DIFFRACTION 2.0Å
e1r11A4[A:215-305] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-intron endonuclease ; X-RAY DIFFRACTION 2.70Å
e1r11B4[B:215-305] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-intron endonuclease ; X-RAY DIFFRACTION 2.70Å
e1rlvB4[B:215-305] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative tRNA-intron endonuclease ; X-RAY DIFFRACTION 3.0Å
e2gjwC4[C:217-307] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.85Å
e3p1zB1[B:90-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.700Å
e2cv8A1[A:81-180] Image Pymol Jmol Links: PDB, SCOP, CATH
TRNA-SPLICING ENDONUCLEASE ; X-RAY DIFFRACTION 2.8Å
e2zyzB2[B:84-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 1.7Å
e2zyzD2[D:84-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 1.7Å
e3if0X2[X:58-149] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NEQ261 ; X-RAY DIFFRACTION 2.200Å
e3p1zD2[D:90-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.700Å
e3p1zF2[F:90-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.700Å
e3p1zH2[H:90-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.700Å
e3p1zJ2[J:90-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.700Å
e3p1zL2[L:90-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.700Å
e3p1yD4[D:225-315] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.050Å
e4fz2A3[A:206-290,A:378-387] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA intron endonuclease ; X-RAY DIFFRACTION 2.25Å
e4fz2B3[B:205-289,B:377-386] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA intron endonuclease ; X-RAY DIFFRACTION 2.25Å
e3ajvA1[A:80-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.7Å
e3p1zA1[A:82-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; X-RAY DIFFRACTION 2.700Å
e3ajvC2[C:82-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.7Å
e3p1zC2[C:82-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; X-RAY DIFFRACTION 2.700Å
e3p1zE2[E:82-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; X-RAY DIFFRACTION 2.700Å
e3p1zG2[G:82-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; X-RAY DIFFRACTION 2.700Å
e3p1zI2[I:82-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; X-RAY DIFFRACTION 2.700Å
e3p1zK2[K:82-170] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative uncharacterized protein ; X-RAY DIFFRACTION 2.700Å
e3ieyA3[A:53-154] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.11Å
e2cv8B3[B:85-180] Image Pymol Jmol Links: PDB, SCOP, CATH
TRNA-SPLICING ENDONUCLEASE ; X-RAY DIFFRACTION 2.8Å
e3p1yA2[A:225-315] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.050Å
e3p1yB2[B:225-315] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.050Å
e3p1yC2[C:225-315] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.050Å
e3ieyB2[B:58-152] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
NEQ261 ; X-RAY DIFFRACTION 2.11Å
e3ajvB1[B:93-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å
e3ajvD2[D:93-186] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; ligands: GOL ; X-RAY DIFFRACTION 1.7Å
e5x89A1[A:257-359] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EndA-like protein,tRNA-splicing endonuclease ; ligands: PO4 ; X-RAY DIFFRACTION 1.53Å
e5x89A2[A:88-184] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
EndA-like protein,tRNA-splicing endonuclease ; ligands: PO4 ; X-RAY DIFFRACTION 1.53Å
e6z9uC1[C:215-309] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease subunit Sen34 ; ligands: GOL ; X-RAY DIFFRACTION 2.1Å
e6z9uA1[A:216-309] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease subunit Sen34 ; ligands: GOL ; X-RAY DIFFRACTION 2.1Å
e7uxaC1[C:337-461] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease subunit Sen2 ; ELECTRON MICROSCOPY
e7zrzBP41[BP4:337-423,BP4:445-461] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease subunit Sen2 ; ELECTRON MICROSCOPY
e4fz2A4[A:79-102,A:299-377] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA intron endonuclease ; X-RAY DIFFRACTION 2.25Å
e4fz2B4[B:78-101,B:298-376] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA intron endonuclease ; X-RAY DIFFRACTION 2.25Å
e2oheA8[A:199-289] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
TRNA-SPLICING ENDONUCLEASE ; X-RAY DIFFRACTION 2.7Å
e2ohcA8[A:199-289] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.5Å
e2ohcB8[B:199-289] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
tRNA-splicing endonuclease ; X-RAY DIFFRACTION 2.5Å
Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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