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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

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

X: Domain II in tail sheath protein Gp18
H: Domain II in tail sheath protein Gp18
T: Domain II in tail sheath protein Gp18
F: Phage_sheath_1N

PF17481

Representatives:

e3foaA2[A:193-345] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; X-RAY DIFFRACTION 3.50Å

e3fo8D1[D:193-360] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ligands: ACT ; X-RAY DIFFRACTION 1.80Å

e3j2mU2[U:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3fohA2[A:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foiC2[C:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foiF6[F:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3fohD6[D:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3fohB6[B:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3fohC6[C:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3fohE6[E:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foiD6[D:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foiE6[E:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3fohF6[F:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foiA6[A:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foiB6[B:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foaB9[B:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; X-RAY DIFFRACTION 3.50Å

e3foaC5[C:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; X-RAY DIFFRACTION 3.50Å

e3j2mV5[V:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2mX5[X:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2mY5[Y:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2mZ5[Z:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2nU5[U:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2nV5[V:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2nW5[W:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2nX5[X:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2nZ5[Z:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2mW5[W:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3j2nY5[Y:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; ELECTRON MICROSCOPY

e3foaD5[D:193-345] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tail sheath protein Gp18 ; X-RAY DIFFRACTION 3.50Å

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