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
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




Representatives:
e3j47R1[R:397-422]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5gjqR2[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e4cr2R1[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S PROTEASOME REGULATORY SUBUNIT RPN7 ; ELECTRON MICROSCOPY
e4cr3R3[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S PROTEASOME REGULATORY SUBUNIT RPN7 ; ELECTRON MICROSCOPY
e4cr4R3[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S PROTEASOME REGULATORY SUBUNIT RPN7 ; ELECTRON MICROSCOPY
e5a5bR3[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S PROTEASOME REGULATORY SUBUNIT RPN7 ; ELECTRON MICROSCOPY
e3jckD3[D:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e3jcoR2[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e3jcpR3[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5l4kR2[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5gjrR3[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5gjr52[5:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5t0gY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5t0hY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5t0iY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5t0jY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5t0cAY3[AY:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5t0cBY1[BY:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5mpdR3[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5mpeR1[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5mpbR1[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5mpcR1[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5wviR1[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5wvkR1[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5ln3R3[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5m32m2[m:363-388] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vgzY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vhfY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vhhY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vhiY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vhsY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6epcR2[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Proteasome (Prosome, macropain) 26S subunit, non-ATPase, 6 ; ELECTRON MICROSCOPY
e6epdR1[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Proteasome (Prosome, macropain) 26S subunit, non-ATPase, 6 ; ELECTRON MICROSCOPY
e6epeR3[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Proteasome (Prosome, macropain) 26S subunit, non-ATPase, 6 ; ELECTRON MICROSCOPY
e6epfR3[R:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Proteasome (Prosome, macropain) 26S subunit, non-ATPase, 6 ; ELECTRON MICROSCOPY
e6fvtR1[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6fvwR2[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e5vfpY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vfqY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vfrY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vfsY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vftY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e5vfuY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6fvuR3[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6fvvR2[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6fvxR3[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6fvyR2[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6mseY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6msgY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6mshY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6msjY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6mskY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6msbY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6msdY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6j2cR3[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6j2qR3[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6j2xR2[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6j2nR1[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6j30R2[R:397-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e6wjdY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e6wjnY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qo5R3[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e7w37Y2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w38Y1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w39Y1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3aY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3bY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3cY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3fY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3gY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3hY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3iY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3jY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3kY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7w3mY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e8amzR1[R:360-386] Image Pymol Jmol Links: PDB, SCOP, CATH
PCI domain-containing protein ; ELECTRON MICROSCOPY
e7qo3R3[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e7qo6R2[R:397-424] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome regulatory subunit RPN7 ; ELECTRON MICROSCOPY
e8cvtY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qxnY3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qxpY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qxuY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qxwY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qxxY1[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qy7Y3[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qyaY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY
e7qybY2[Y:363-389] Image Pymol Jmol Links: PDB, SCOP, CATH
26S proteasome non-ATPase regulatory subunit 6 ; ELECTRON MICROSCOPY