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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

X: Thioredoxin-like
H: Thioredoxin-like
T: Thioredoxin-like
F: GST_N

PF02798 CL0172

Representatives:

e1k3yA2[A:2-80] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE A1 ; ligands: GOL,GTX ; X-RAY DIFFRACTION 1.30Å

e2c4jA2[A:2-85] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE MU 2 ; ligands: GSO ; X-RAY DIFFRACTION 1.350Å

e2a2rA2[A:1-77] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE P ; ligands: GSN,MES ; X-RAY DIFFRACTION 1.4Å

e4dejC5[C:8-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejI5[I:9-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejB5[B:8-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejH5[H:8-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejL5[L:8-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejJ5[J:8-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejK5[K:8-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejE5[E:9-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4dejF5[F:9-87] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE RELATED PROTEIN ; X-RAY DIFFRACTION 2.9Å

e4topA1[A:2-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2,4-D inducible glutathione S-transferase ; ligands: GSH ; X-RAY DIFFRACTION 2.35Å

e4topB1[B:1-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

2,4-D inducible glutathione S-transferase ; ligands: GSH ; X-RAY DIFFRACTION 2.35Å

e4chsA2[A:2-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: GS8 ; X-RAY DIFFRACTION 1.60Å

e4chsB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: GS8 ; X-RAY DIFFRACTION 1.60Å

e5agyA2[A:1-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: 4NM,GTB,PO4 ; X-RAY DIFFRACTION 1.75Å

e5agyB1[B:3-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: GTB,PO4 ; X-RAY DIFFRACTION 1.75Å

e5echB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 2.140Å

e5echC1[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 2.140Å

e5echE1[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 2.140Å

e5echF1[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 2.140Å

e5eciB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 1.560Å

e5eciC1[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 1.560Å

e5eciE2[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 1.560Å

e5eciF2[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 1.560Å

e5eckB1[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.540Å

e5eckC2[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.540Å

e5eckE1[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.540Å

e5eckF2[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.540Å

e5eclB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.850Å

e5eclC2[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.850Å

e5eclE2[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.850Å

e5eclF1[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,ILE ; X-RAY DIFFRACTION 1.850Å

e5ecmB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.600Å

e5ecmC1[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.600Å

e5ecmE1[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.600Å

e5ecmF1[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.600Å

e5ecnB1[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.720Å

e5ecnC1[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.720Å

e5ecnE1[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.720Å

e5ecnF2[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.720Å

e5ecoB1[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.800Å

e5ecoC2[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.800Å

e5ecoE1[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.800Å

e5ecoF2[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,LEU ; X-RAY DIFFRACTION 1.800Å

e5ecpB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,MET ; X-RAY DIFFRACTION 2.25Å

e5ecpC1[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,MET ; X-RAY DIFFRACTION 2.25Å

e5ecpE2[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,MET ; X-RAY DIFFRACTION 2.25Å

e5ecpF2[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,MET ; X-RAY DIFFRACTION 2.25Å

e5ecqB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.660Å

e5ecqC2[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.660Å

e5ecqE1[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.660Å

e5ecqF2[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.660Å

e5ecrB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.720Å

e5ecrC1[C:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.720Å

e5ecrE2[E:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.720Å

e5ecrF2[F:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH,VAL ; X-RAY DIFFRACTION 1.720Å

e5ecsA1[A:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 1.65Å

e5ecsB2[B:4-83] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase U20 ; ligands: GSH ; X-RAY DIFFRACTION 1.65Å

e5g5eA1[A:2-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TAU CLASS GLUTATHIONE S-TRANSFERASE ; ligands: ACT,PEG ; X-RAY DIFFRACTION 1.80Å

e5kejA2[A:2-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tau class glutathione S-transferase ; ligands: GTX,PEG ; X-RAY DIFFRACTION 2.35Å

e5kejB1[B:2-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tau class glutathione S-transferase ; ligands: GTX,PEG ; X-RAY DIFFRACTION 2.35Å

e5g5fA1[A:3-84] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

TAU CLASS GLUTATHIONE S-TRANSFERASE ; ligands: GSH,PEG ; X-RAY DIFFRACTION 2.30Å

e5j4uA2[A:3-84] Image Pymol Jmol Links: PDB, SCOP, CATH

Glutathione transferase family protein ; ligands: GSH ; X-RAY DIFFRACTION 1.249Å

e5j5nA2[A:3-84] Image Pymol Jmol Links: PDB, SCOP, CATH

Glutathione transferase family protein ; ligands: GSH ; X-RAY DIFFRACTION 2.6Å

e5j5nB2[B:3-84] Image Pymol Jmol Links: PDB, SCOP, CATH

Glutathione transferase family protein ; ligands: GSH ; X-RAY DIFFRACTION 2.6Å

e5g5aA2[A:2-83] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE U25 ; ligands: GSH ; X-RAY DIFFRACTION 1.95Å

e5g5aB1[B:2-83] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE U25 ; ligands: GSH ; X-RAY DIFFRACTION 1.95Å

e5g5aC1[C:2-83] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE U25 ; ligands: GSH ; X-RAY DIFFRACTION 1.95Å

e5g5aD1[D:3-83] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE U25 ; ligands: GSH ; X-RAY DIFFRACTION 1.95Å

e1f2eD2[D:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 2.3Å

e1f2eC2[C:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 2.3Å

e1f2eA2[A:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 2.3Å

e1f2eB2[B:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 2.3Å

e2x64A2[A:0-76] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE-S-TRANSFERASE ; ligands: CL,GSH ; X-RAY DIFFRACTION 2.3Å

e2x64B2[B:-1-76] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE-S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 2.3Å

e2x64C2[C:-1-76] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE-S-TRANSFERASE ; ligands: CL,GSH ; X-RAY DIFFRACTION 2.3Å

e2x64D2[D:0-76] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE-S-TRANSFERASE ; ligands: CL,GSH ; X-RAY DIFFRACTION 2.3Å

e2x64E2[E:1-76] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE-S-TRANSFERASE ; ligands: CL,GSH ; X-RAY DIFFRACTION 2.3Å

e2x64F2[F:0-76] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE-S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 2.3Å

e4iq1B2[B:-4-80] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE TRANSFERASE ; ligands: CL ; X-RAY DIFFRACTION 1.85Å

e4iw9B2[B:-5-80] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE TRANSFERASE ; ligands: CL,GSH ; X-RAY DIFFRACTION 1.76Å

e4iw9C6[C:-1-79] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 1.76Å

e4iq1A4[A:0-79] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE TRANSFERASE ; ligands: CL,GOL ; X-RAY DIFFRACTION 1.85Å

e4iw9A8[A:0-79] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 1.76Å

e4iq1C8[C:-1-79] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE TRANSFERASE ; X-RAY DIFFRACTION 1.85Å

e4gf0A3[A:0-80] Image Pymol Jmol Links: PDB, SCOP, CATH

GLUTATHIONE S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 1.75Å

e2ntoA2[A:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: GSH,SO4 ; X-RAY DIFFRACTION 2.1Å

e2pvqA2[A:1-80] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

glutathione S-transferase ; ligands: GSH ; X-RAY DIFFRACTION 1.803Å

Previous

e1tu7A2[A:1-77] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Glutathione S-transferase 2 ; ligands: GOL,GSH ; X-RAY DIFFRACTION 1.5Å

e1oe8A2[A:4-84] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 1.650Å

e1jlvA2[A:1-84] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

glutathione transferase GST1-3 ; ligands: GSH ; X-RAY DIFFRACTION 1.75Å

e1m0uA2[A:47-122] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GST2 gene product ; ligands: GSH ; X-RAY DIFFRACTION 1.75Å

e4px1A1[A:1-81] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH

Maleylacetoacetate isomerase (Glutathione S-transferase) ; ligands: CL,MLA ; X-RAY DIFFRACTION 1.850Å

e1oktA2[A:1-85] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: FMT ; X-RAY DIFFRACTION 1.900Å

e1k0dA2[A:109-200] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

URE2 PROTEIN ; ligands: GSH ; X-RAY DIFFRACTION 2.2Å

e1nhyA2[A:1-75] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Elongation factor 1-gamma 1 ; ligands: SO4 ; X-RAY DIFFRACTION 3.0Å

e1ljrA2[A:1-79] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: GSH ; X-RAY DIFFRACTION 3.2Å

e1gnwA2[A:2-85] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

GLUTATHIONE S-TRANSFERASE ; ligands: GTX ; X-RAY DIFFRACTION

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 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