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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

X: HTH
H: Phage G20C small terminase N-terminal domain
T: Phage G20C small terminase N-terminal domain
F: TerS_N

PF21434 CL0123

Representatives:

e4xvnF1[F:1-53] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Small terminase ; X-RAY DIFFRACTION 2.6Å

e4xvnA2[A:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Small terminase ; X-RAY DIFFRACTION 2.6Å

e4xvnB1[B:6-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Small terminase ; X-RAY DIFFRACTION 2.6Å

e4xvnC2[C:2-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Small terminase ; X-RAY DIFFRACTION 2.6Å

e4xvnD2[D:2-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Small terminase ; X-RAY DIFFRACTION 2.6Å

e4xvnE2[E:4-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Small terminase ; X-RAY DIFFRACTION 2.6Å

e6ejqB1[B:-2-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Terminase small subunit ; X-RAY DIFFRACTION 2.300Å

e6ejqG1[G:4-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Terminase small subunit ; X-RAY DIFFRACTION 2.300Å

e6ejqA2[A:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Terminase small subunit ; X-RAY DIFFRACTION 2.300Å

e6ejqC1[C:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Terminase small subunit ; X-RAY DIFFRACTION 2.300Å

e6ejqD1[D:4-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Terminase small subunit ; X-RAY DIFFRACTION 2.300Å

e6ejqF1[F:0-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Terminase small subunit ; X-RAY DIFFRACTION 2.300Å

e6ejqH2[H:2-53] Image Pymol Jmol Links: PDB, SCOP, CATH

Terminase small subunit ; X-RAY DIFFRACTION 2.300Å

e6v1iA1[A:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iB1[B:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iC1[C:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iD1[D:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iE2[E:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iF2[F:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iG2[G:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iH1[H:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

e6v1iI1[I:1-53] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Small terminase protein ; ELECTRON MICROSCOPY

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