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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

X: Retrovirus capsid protein
H: Retrovirus capsid protein-C
T: Retrovirus capsid protein-C
F: Gag_p24_C

PF19317 CL0148

Representatives:

e1a8oA1[A:151-220] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HIV CAPSID ; X-RAY DIFFRACTION 1.7Å

e1vv3B1[B:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu5W1[W:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuhG1[G:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv821[2:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuaS1[S:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv2S1[S:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu7F1[F:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv7y1[y:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vunh1[h:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv4V1[V:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuvk1[k:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv9t1[t:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuuI1[I:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv6T1[T:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuhP1[P:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu4P1[P:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu5K1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuwj1[j:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vumu1[u:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu7s1[s:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vumK1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu4v1[v:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vudr1[r:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv0J1[J:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e3j3471[7:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

capsid protein ; ELECTRON MICROSCOPY

e1vuvV1[V:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8A1[A:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvgo1[o:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vudi1[i:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv2Y1[Y:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuyz1[z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8n1[n:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu6m1[m:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vukh1[h:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvgj1[j:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv2z1[z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu4M1[M:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu6Y1[Y:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8Q1[Q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvfW1[W:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vucE1[E:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv7T1[T:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vujS1[S:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuap1[p:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuov1[v:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu5A1[A:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e3j34h1[h:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

capsid protein ; ELECTRON MICROSCOPY

e1vuyQ1[Q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vutK1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vudl1[l:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv9Y1[Y:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu711[1:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu6g1[g:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv8q1[q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuyC1[C:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuvB1[B:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuru1[u:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvbQ1[Q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vusz1[z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vulK1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuyl1[l:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vusM1[M:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv0D1[D:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8j1[j:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvar1[r:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv4q1[q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv6p1[p:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv6g1[g:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuiF1[F:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu4Y1[Y:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv9d1[d:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv5c1[c:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vviI1[I:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv2N1[N:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvbB1[B:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vudc1[c:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vueV1[V:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vupE1[E:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuoF1[F:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu7Q1[Q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vunz1[z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuyu1[u:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuyq1[q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vumA1[A:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vunC1[C:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuhC1[C:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vugt1[t:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu4B1[B:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuoq1[q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvaQ1[Q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu7g1[g:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvhf1[f:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8s1[s:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuco1[o:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vurJ1[J:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv8K1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvhq1[q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvfQ1[Q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuim1[m:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuvb1[b:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuzM1[M:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv8j1[j:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuca1[a:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vufU1[U:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vucX1[X:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv2G1[G:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv8Y1[Y:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu9D1[D:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu9M1[M:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vujA1[A:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuxr1[r:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu6y1[y:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vupt1[t:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vugR1[R:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuj21[2:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vudu1[u:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv7K1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vutf1[f:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuoN1[N:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv411[1:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuaJ1[J:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vudw1[w:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuxh1[h:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vukV1[V:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuua1[a:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vufC1[C:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vumJ1[J:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vujc1[c:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv8b1[b:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuab1[b:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8X1[X:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vusi1[i:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vunA1[A:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv2v1[v:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuaA1[A:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vufH1[H:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuaz1[z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuw01[0:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vumi1[i:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv3b1[b:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vueA1[A:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu7C1[C:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuut1[t:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vujG1[G:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu401[0:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv0F1[F:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuqi1[i:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vulZ1[Z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu9p1[p:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuxN1[N:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv6M1[M:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vurX1[X:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv3T1[T:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuwc1[c:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuxW1[W:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuiV1[V:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vufQ1[Q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vupi1[i:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuqf1[f:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuko1[o:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8N1[N:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv4W1[W:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vugB1[B:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuzW1[W:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuyL1[L:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vugg1[g:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu8C1[C:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu5t1[t:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuaT1[T:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv4I1[I:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuwx1[x:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuxm1[m:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vulF1[F:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu9f1[f:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv2g1[g:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuvd1[d:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv8F1[F:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv6B1[B:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvfq1[q:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuez1[z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv6I1[I:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuiH1[H:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvac1[c:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vucB1[B:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vunZ1[Z:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu5r1[r:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv6f1[f:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vucK1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvaJ1[J:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vv9G1[G:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vugK1[K:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuwX1[X:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuje1[e:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vulc1[c:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvhn1[n:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuwr1[r:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vudD1[D:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vuzw1[w:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vvfN1[N:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

e1vu7n1[n:149-231] Image Pymol Jmol Links: PDB, SCOP, CATH Obsolete PDB

Previous Next

e1d1dA1[A:151-230] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

PROTEIN (CAPSID PROTEIN) ; SOLUTION NMR

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.

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