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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

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

X: Subtilisin-like
H: Domain III of tail sheath protein Gp18
T: Domain III of tail sheath protein Gp18
F: Phage_sheath_1

PF04984

Representatives:

e6gkwA1[A:4-231] * nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative phage XkdK-like protein ; X-RAY DIFFRACTION 1.900Å

e6j0bA1[A:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bB1[B:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bC1[C:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bD1[D:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bE1[E:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bF1[F:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bG1[G:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bH1[H:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bI1[I:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bJ1[J:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bK1[K:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0bL1[L:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cA1[A:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cB1[B:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cC1[C:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cD1[D:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cE1[E:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cF1[F:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0ca1[a:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cb1[b:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cc1[c:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cd1[d:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0ce1[e:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0cf1[f:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0nh1[h:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0ni1[i:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0nj1[j:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0nk1[k:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0nl1[l:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6j0nm1[m:25-244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc2 ; ELECTRON MICROSCOPY

e6raoC2[C:25-243] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp2 ; ELECTRON MICROSCOPY

e6raoD2[D:25-67,D:106-214,D:265-340] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp3 ; ELECTRON MICROSCOPY

e6rapC2[C:25-243] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp2 ; ELECTRON MICROSCOPY

e6rapD2[D:25-67,D:106-214,D:265-340] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp3 ; ELECTRON MICROSCOPY

e6rc8A2[A:25-243] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp2 ; ELECTRON MICROSCOPY

e6rc8B2[B:25-65,B:109-216,B:264-340] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp3 ; ELECTRON MICROSCOPY

e6rbnD1[D:25-67,D:106-214,D:265-340] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp3 ; ELECTRON MICROSCOPY

e6rbnC1[C:25-243] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp2 ; ELECTRON MICROSCOPY

e6rglB1[B:25-243] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp2 ; ELECTRON MICROSCOPY

e6rglA1[A:25-243] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp2 ; ELECTRON MICROSCOPY

e6rglC1[C:25-65,C:109-216,C:264-340] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Afp3 ; ELECTRON MICROSCOPY

e6j0nt1[t:5-200,t:234-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc3 ; ELECTRON MICROSCOPY

e6j0nu1[u:5-200,u:234-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc3 ; ELECTRON MICROSCOPY

e6j0nv1[v:5-200,v:234-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc3 ; ELECTRON MICROSCOPY

e6j0nw2[w:5-200,w:234-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc3 ; ELECTRON MICROSCOPY

e6j0nx1[x:5-200,x:234-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc3 ; ELECTRON MICROSCOPY

e6j0ny1[y:5-200,y:234-329] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Pvc3 ; ELECTRON MICROSCOPY

e8bkyA2[A:24-90,A:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyB1[B:24-90,B:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyC2[C:24-90,C:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyD2[D:24-90,D:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyE2[E:24-90,E:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyF2[F:24-90,F:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyG2[G:24-90,G:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyH1[H:24-90,H:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyI1[I:24-90,I:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyJ2[J:24-90,J:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyK2[K:24-90,K:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyL1[L:24-90,L:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyM1[M:24-90,M:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyN1[N:24-90,N:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyO1[O:24-90,O:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyP1[P:24-90,P:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyQ1[Q:24-90,Q:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyR1[R:24-90,R:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyS1[S:24-90,S:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyT1[T:24-90,T:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyU2[U:24-90,U:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyV2[V:24-90,V:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyW2[W:24-90,W:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bkyX2[X:24-90,X:249-418] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath protein ; ELECTRON MICROSCOPY

e8bl4V2[V:29-96,V:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4P2[P:29-96,P:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4J2[J:29-96,J:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4D2[D:29-96,D:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4W1[W:29-96,W:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4Q2[Q:29-96,Q:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4K2[K:29-96,K:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4E2[E:29-96,E:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4X2[X:29-96,X:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4R1[R:29-96,R:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4L1[L:29-96,L:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4F1[F:29-96,F:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4S2[S:29-96,S:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4M1[M:29-96,M:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4G1[G:29-96,G:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4A1[A:29-96,A:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4T2[T:29-96,T:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4N2[N:29-96,N:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4H1[H:29-96,H:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4B2[B:29-96,B:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4U2[U:29-96,U:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4O1[O:29-96,O:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4I2[I:29-96,I:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

e8bl4C1[C:29-96,C:239-423] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Phage tail sheath family protein ; ELECTRON MICROSCOPY

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.

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