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X - Possible homology level

H - Homology level

T - Topology level

F - Family level

* - Provisional representative

Keyword search

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

X: jelly-roll
H: C-terminal domain of mullusc hemocyanin
T: C-terminal domain of mullusc hemocyanin
F: Haemocyan_bet_s

PF14830

Representatives:

e1js8A1[A:2792-2892] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin ; ligands: CUO,MAN ; X-RAY DIFFRACTION

e1lnlB1[B:305-405] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.3Å

e1lnlA1[A:305-405] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.3Å

e1js8B1[B:2792-2892] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin ; ligands: CUO,MAN ; X-RAY DIFFRACTION

e1lnlC1[C:305-405] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.3Å

e3qjoB2[B:3208-3306] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin 1 ; X-RAY DIFFRACTION 4Å

e3l6wB2[B:3196-3290] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin 1 ; X-RAY DIFFRACTION 4.000Å

e3l6wA2[A:3196-3294] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin 1 ; X-RAY DIFFRACTION 4.000Å

e3qjoA2[A:3208-3306] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin 1 ; X-RAY DIFFRACTION 4Å

e4bedA5[A:302-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedA8[A:726-826] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedA7[A:1139-1244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedA6[A:1547-1664] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedC7[C:302-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedC8[C:726-826] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedC6[C:1139-1244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedC5[C:1547-1664] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedD5[D:2380-2493] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedD6[D:2791-2901] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedD9[D:3198-3296] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e3j32B12[B:1972-2078] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32B6[B:2383-2495] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32B11[B:2793-2903] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32B5[B:3203-3303] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32B8[B:301-404] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32B1[B:726-828] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32B2[B:1139-1244] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32B9[B:1548-1658] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e4bedD7[D:1970-2076] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4yd9F2[F:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9I2[I:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9L2[L:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9O2[O:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9R2[R:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9U2[U:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9X2[X:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9a2[a:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9d2[d:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9D6[D:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9G6[G:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9J6[J:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9M6[M:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9P6[P:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9S6[S:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9b6[b:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9D7[D:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9G7[G:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9J7[J:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9M7[M:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9P7[P:724-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9S7[S:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9b7[b:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9E4[E:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9H4[H:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9K4[K:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9N4[N:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9Q4[Q:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9T4[T:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9W4[W:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9Z4[Z:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9c4[c:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9D8[D:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9G8[G:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9J8[J:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9M8[M:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9P8[P:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9S8[S:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9b8[b:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9D5[D:1549-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9G5[G:1549-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9J5[J:1549-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9M5[M:1548-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9P5[P:1549-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9S5[S:1549-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9b5[b:1548-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9E3[E:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9H3[H:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9K3[K:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9N3[N:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9Q3[Q:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9T3[T:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9W3[W:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9Z3[Z:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9c3[c:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9C1[C:3210-3310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO ; X-RAY DIFFRACTION 3.00Å

e4yd9A6[A:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9V7[V:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9Y4[Y:300-403] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9A3[A:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9V1[V:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9Y3[Y:725-827] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9B4[B:2801-2907] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9A7[A:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9V6[V:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9Y5[Y:1140-1242] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; X-RAY DIFFRACTION 3.00Å

e4yd9A1[A:1548-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9V3[V:1548-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9Y1[Y:1548-1656] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: NAG ; X-RAY DIFFRACTION 3.00Å

e4yd9B3[B:2393-2492] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

hemocyanin ; ligands: CUO,NAG ; X-RAY DIFFRACTION 3.00Å

e3j32A10[A:1972-2078] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32A12[A:2383-2495] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32A14[A:2793-2903] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32A16[A:3203-3303] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32A2[A:301-404] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

3j32 is a homology model based on 1js8

e3j32A4[A:726-828] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32A6[A:1139-1244] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e3j32A8[A:1548-1658] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Hemocyanin isoform 1 ; ELECTRON MICROSCOPY

e4bedB2[B:1970-2076] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedB4[B:2380-2493] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedB6[B:2791-2901] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; ELECTRON MICROSCOPY

e4bedB8[B:3198-3296] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

HEMOCYANIN KLH1 ; 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.

X: Glycosyl hydrolase domain-like

some similarity with Ig fold

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