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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

X: Phage tail fiber protein trimerization domain
H: Phage tail fiber protein trimerization domain
T: Phage tail fiber protein trimerization domain
F: Phage_spike

PF18715 CL0606

Representatives:

e3aqjA1[A:18-134] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE2 ; X-RAY DIFFRACTION 1.27Å

e3vtnA1[A:113-183] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein gp45 ; ligands: FE ; X-RAY DIFFRACTION 1.75Å

e3vtoB1[B:91-200] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein gp45 ; ligands: CA,CL,FE ; X-RAY DIFFRACTION 1.44Å

e3aqjC1[C:18-134] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE2 ; X-RAY DIFFRACTION 1.27Å

e3vtoR1[R:91-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein gp45 ; ligands: CA,CL,FE ; X-RAY DIFFRACTION 1.44Å

e3aqjR1[R:18-134] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE2 ; X-RAY DIFFRACTION 1.27Å

e3vtoA1[A:91-189] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein gp45 ; ligands: CA,CL,FE ; X-RAY DIFFRACTION 1.44Å

e3vtoQ1[Q:91-198] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein gp45 ; ligands: CA,CL,FE ; X-RAY DIFFRACTION 1.44Å

e3aqjQ1[Q:19-134] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE2 ; X-RAY DIFFRACTION 1.27Å

e3vtoC1[C:91-199] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein gp45 ; ligands: CA,CL,FE ; X-RAY DIFFRACTION 1.44Å

e3qr7A1[A:97-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE,NA ; X-RAY DIFFRACTION 0.94Å

e3qr7B1[B:97-211] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE ; X-RAY DIFFRACTION 0.94Å

e3vtoP1[P:91-192] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Protein gp45 ; ligands: CA,CL,FE ; X-RAY DIFFRACTION 1.44Å

e3aqjB1[B:21-134] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE2 ; X-RAY DIFFRACTION 1.27Å

e3aqjP1[P:21-134] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; ligands: CA,CL,FE2 ; X-RAY DIFFRACTION 1.27Å

e3qr8A2[A:93-163] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Baseplate assembly protein V ; X-RAY DIFFRACTION 2.03Å

F: Unmapped domains

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.

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