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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

X: LuxS, MPP, ThrRS/AlaRS common domain

looks like an elaborated ferredoxin

X: ClpS-like

contains a HTH motif

X: Ribosomal protein S5 domain 2-like
H: Ribosomal protein S5 domain 2-like
T: Ribosomal protein S5 domain 2-like
F: MVD-like_N

PF22700

Representatives:

e1fi4A2[A:3-190] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE 5-DIPHOSPHATE DECARBOXYLASE ; X-RAY DIFFRACTION 2.25Å

e3f0nA1[A:-3-193] Image Pymol Jmol Links: PDB, SCOP, CATH

MEVALONATE PYROPHOSPHATE DECARBOXYLASE ; ligands: PO4 ; X-RAY DIFFRACTION 1.900Å

e3d4jA1[A:8-194] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DIPHOSPHOMEVALONATE DECARBOXYLASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.4Å

e3f0nB2[B:7-193] Image Pymol Jmol Links: PDB, SCOP, CATH

MEVALONATE PYROPHOSPHATE DECARBOXYLASE ; ligands: PO4 ; X-RAY DIFFRACTION 1.900Å

e2hkeB2[B:4-181] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase, putative ; ligands: SO4 ; X-RAY DIFFRACTION 1.800Å

e2hkeA3[A:4-182] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase, putative ; ligands: SO4 ; X-RAY DIFFRACTION 1.800Å

e3ltoA3[A:9-178] Image Pymol Jmol Links: PDB, SCOP, CATH

Mevalonate diphosphate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.27Å

e3ltoB3[B:10-178] Image Pymol Jmol Links: PDB, SCOP, CATH

Mevalonate diphosphate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.27Å

e3qt6A5[A:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: 2P0 ; X-RAY DIFFRACTION 2.05Å

e2hk2B5[B:1000-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; X-RAY DIFFRACTION 2.300Å

e2hk3B5[B:1000-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DIPHOSPHOMEVALONATE DECARBOXYLASE ; X-RAY DIFFRACTION 2.3Å

e3qt5A3[A:-1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; X-RAY DIFFRACTION 1.85Å

e2hk3A5[A:1000-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DIPHOSPHOMEVALONATE DECARBOXYLASE ; X-RAY DIFFRACTION 2.3Å

e3qt7A5[A:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: FM0 ; X-RAY DIFFRACTION 2.2Å

e3qt8A3[A:-4-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: FM0,GOL ; X-RAY DIFFRACTION 2.1Å

e3qt8B5[B:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: FM0 ; X-RAY DIFFRACTION 2.1Å

e3qt5B5[B:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; X-RAY DIFFRACTION 1.85Å

e3qt6B5[B:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: 2P0 ; X-RAY DIFFRACTION 2.05Å

e4du8A5[A:-2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: 2P0,GOL ; X-RAY DIFFRACTION 2.1Å

e4dptA5[A:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: GOL ; X-RAY DIFFRACTION 2.19Å

e2gs8A3[A:-1-155] Image Pymol Jmol Links: PDB, SCOP, CATH

MEVALONATE PYROPHOSPHATE DECARBOXYLASE ; ligands: EDO ; X-RAY DIFFRACTION 1.5Å

e3qt7B5[B:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: FM0 ; X-RAY DIFFRACTION 2.2Å

e4dpyA5[A:-2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: 2P0 ; X-RAY DIFFRACTION 2.14Å

e4dpxA5[A:-2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: FMT,GOL ; X-RAY DIFFRACTION 1.95Å

e4dpuB5[B:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,FM0 ; X-RAY DIFFRACTION 1.9Å

e4dpuA5[A:-2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,FM0 ; X-RAY DIFFRACTION 1.9Å

e4dpwB5[B:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6 ; X-RAY DIFFRACTION 2.6Å

e4dpwA5[A:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6,FMT ; X-RAY DIFFRACTION 2.6Å

e4dpwE5[E:-1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6,FMT ; X-RAY DIFFRACTION 2.6Å

e4dpwG5[G:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6,FMT ; X-RAY DIFFRACTION 2.6Å

e4dpwD5[D:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6 ; X-RAY DIFFRACTION 2.6Å

e4dpwF5[F:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6 ; X-RAY DIFFRACTION 2.6Å

e4dpwC5[C:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6 ; X-RAY DIFFRACTION 2.6Å

e4dpwH5[H:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,DP6 ; X-RAY DIFFRACTION 2.6Å

e4du7A5[A:-1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: DP6,FMT ; X-RAY DIFFRACTION 2.2Å

e4dpxB5[B:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: FMT,GOL ; X-RAY DIFFRACTION 1.95Å

e4dptB5[B:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: AGS,FM0 ; X-RAY DIFFRACTION 2.19Å

e4du7B5[B:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: DP6,FMT ; X-RAY DIFFRACTION 2.2Å

e4dpyB5[B:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: 2P0 ; X-RAY DIFFRACTION 2.14Å

e4du8B5[B:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

MEVALONATE DIPHOSPHATE DECARBOXYLASE ; ligands: 2P0 ; X-RAY DIFFRACTION 2.1Å

e3d4jB3[B:9-193] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

DIPHOSPHOMEVALONATE DECARBOXYLASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.4Å

e2hk2A5[A:1000-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; X-RAY DIFFRACTION 2.300Å

e4rkpB1[B:-1-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein Ta1305 ; ligands: ACT,SO4 ; X-RAY DIFFRACTION 2.000Å

e4rkpA1[A:2-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein Ta1305 ; ligands: ACT,SO4 ; X-RAY DIFFRACTION 2.000Å

e4rksA2[A:2-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein Ta1305 ; ligands: MEV,SO4 ; X-RAY DIFFRACTION 2.000Å

e4rksB2[B:-1-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein Ta1305 ; ligands: ACT,GOL,MEV,SO4 ; X-RAY DIFFRACTION 2.000Å

e4rkzA2[A:2-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein Ta1305 ; ligands: 3S4,ADP,SO4 ; X-RAY DIFFRACTION 2.300Å

e4rkzB2[B:-1-210] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Putative uncharacterized protein Ta1305 ; ligands: 3S4,SO4 ; X-RAY DIFFRACTION 2.300Å

e4z7cA1[A:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: GOL,NA,PO4 ; X-RAY DIFFRACTION 2.20Å

e4z7yA1[A:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å

e4z7yB1[B:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å

e4z7yC1[C:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å

e4z7yD1[D:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å

e4z7yE1[E:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å

e4z7yF1[F:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2.7Å

e5gmdA1[A:1-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: AGS,AMP,DP6,SO4 ; X-RAY DIFFRACTION 1.50Å

e5gmeA1[A:2-177] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: ADP,AMP,DP6,SO4 ; X-RAY DIFFRACTION 1.70Å

e5v2lA1[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: ATP,PO4 ; X-RAY DIFFRACTION 2.1Å

e5v2mA2[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 2Å

e6n10A1[A:3-198] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase MVD1, peroxisomal ; ligands: DP6,SO4 ; X-RAY DIFFRACTION 2.30Å

e6n0xA1[A:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: PMV ; X-RAY DIFFRACTION 1.44Å

e6n0xB1[B:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: PMV ; X-RAY DIFFRACTION 1.44Å

e6n0xC2[C:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: PMV ; X-RAY DIFFRACTION 1.44Å

e6n0xD1[D:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: PMV ; X-RAY DIFFRACTION 1.44Å

e6n0xE1[E:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: PMV ; X-RAY DIFFRACTION 1.44Å

e6n0xF2[F:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: PMV ; X-RAY DIFFRACTION 1.44Å

e6n0yA1[A:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 2.20Å

e6n0yB2[B:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 2.20Å

e6n0yC2[C:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 2.20Å

e6n0yD1[D:1-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 2.20Å

e6n0yE1[E:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 2.20Å

e6n0yF2[F:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 2.20Å

e6n0zA1[A:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 1.950Å

e6n0zB1[B:-3-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 1.950Å

e6n0zC1[C:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 1.950Å

e6n0zD2[D:-2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 1.950Å

e6n0zE1[E:2-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 1.950Å

e6n0zF1[F:0-168] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Diphosphomevalonate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 1.950Å

e6e2sA2[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 1.791Å

e6e2tA1[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: DP6 ; X-RAY DIFFRACTION 1.692Å

e6e2uA1[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: ACP,DP6,MG ; X-RAY DIFFRACTION 2.045Å

e6e2vA2[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: ADP,BEF,DP6,MG ; X-RAY DIFFRACTION 2.1Å

e6e2wA1[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: ADP,CO,DP6,SO4 ; X-RAY DIFFRACTION 1.95Å

e6e2yA2[A:0-167] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Mevalonate diphosphate decarboxylase ; ligands: ADP,CO,DP6,SO4 ; X-RAY DIFFRACTION 2.34Å

e6xr5A2[A:0-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: ADE,SO4 ; X-RAY DIFFRACTION 1.700Å

e6xr5B2[B:0-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: ADE,SO4 ; X-RAY DIFFRACTION 1.700Å

e6xr5C2[C:0-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: SO4 ; X-RAY DIFFRACTION 1.700Å

e6xr5D2[D:0-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: ADE,SO4 ; X-RAY DIFFRACTION 1.700Å

e6xr5E2[E:1-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: ADE,SO4 ; X-RAY DIFFRACTION 1.700Å

e6xr5F1[F:1-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: EDO,SO4 ; X-RAY DIFFRACTION 1.700Å

e6xr5G2[G:1-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: EDO ; X-RAY DIFFRACTION 1.700Å

e6xr5H2[H:0-191] Image Pymol Jmol Links: PDB, SCOP, CATH

Diphosphomevalonate decarboxylase ; ligands: ADE,SO4 ; X-RAY DIFFRACTION 1.700Å

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.

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