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




Representatives:
e1eyeA1[A:5-274]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
DIHYDROPTEROATE SYNTHASE I ; ligands: MG,PMM ; X-RAY DIFFRACTION 1.7Å
e5jq9B1[B:0-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 6MB ; X-RAY DIFFRACTION 2.101Å
e5jq9A1[A:1-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 6MB,EDO ; X-RAY DIFFRACTION 2.101Å
e1aj0A1[A:14-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: PH2,SAN,SO4 ; X-RAY DIFFRACTION 2.0Å
e1aj2A1[A:14-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: 2PH,SO4 ; X-RAY DIFFRACTION 2.0Å
e1ajzA1[A:14-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.0Å
e1twwB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: HH2,SO4 ; X-RAY DIFFRACTION 2.5Å
e1twwA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: HH2,SO4 ; X-RAY DIFFRACTION 2.5Å
e1twsB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 2Å
e1ad4B1[B:2-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHETASE ; ligands: K,MN ; X-RAY DIFFRACTION 2.4Å
e1ad4A1[A:2-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHETASE ; ligands: HH2,K,MN ; X-RAY DIFFRACTION 2.4Å
e1tx0B1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: PT1,SO4 ; X-RAY DIFFRACTION 2.15Å
e1twzA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: PMM,SO4 ; X-RAY DIFFRACTION 2.75Å
e1ad1B1[B:2-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHETASE ; ligands: K ; X-RAY DIFFRACTION 2.2Å
e1twsA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 2Å
e1tx2B1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: 680,SO4 ; X-RAY DIFFRACTION 1.83Å
e1ad1A1[A:2-259] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHETASE ; ligands: K,TRS ; X-RAY DIFFRACTION 2.2Å
e1twzB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: PMM,SO4 ; X-RAY DIFFRACTION 2.75Å
e1tx0A1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DHPS, Dihydropteroate synthase ; ligands: PT1,SO4 ; X-RAY DIFFRACTION 2.15Å
e1f6yB1[B:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-METHYLTETRAHYDROFOLATE CORRINOID/IRON SULFUR PROTEIN METHYLTRANSFERASE ; X-RAY DIFFRACTION 2.2Å
e1q8aA2[A:301-559] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 1.7Å
e3bolB2[B:301-560] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 1.850Å
e1q7zA2[A:301-559] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 1.7Å
e1q85B2[B:301-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 2.00Å
e3bofB2[B:301-560] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 1.70Å
e1q7mA2[A:301-559] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 2.10Å
e1q8jA2[A:301-559] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; ligands: C2F ; X-RAY DIFFRACTION 1.90Å
e1q8jB2[B:301-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; ligands: C2F ; X-RAY DIFFRACTION 1.90Å
e1q7zB2[B:301-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 1.7Å
e1q85A2[A:301-559] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 2.00Å
e1q7mB2[B:301-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 2.10Å
e1q7qA2[A:301-560] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 3.1Å
e1q8aB2[B:301-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 1.7Å
e3bolA2[A:301-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 1.850Å
e1q7qB2[B:301-558] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; X-RAY DIFFRACTION 3.1Å
e3tr9A1[A:12-293] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: CL,NA,PT1 ; X-RAY DIFFRACTION 1.895Å
e2y5jA1[A:3-292] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: EDO ; X-RAY DIFFRACTION 2.33Å
e3h21A1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B52,SO4 ; X-RAY DIFFRACTION 2.32Å
e3tyuA1[A:1-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; ligands: PT1 ; X-RAY DIFFRACTION 2.700Å
e4hb7A1[A:2-264] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: EDO ; X-RAY DIFFRACTION 1.900Å
e3tyaA1[A:2-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: 78H,SO4 ; X-RAY DIFFRACTION 2.61Å
e4d8zA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 0J2,SO4 ; X-RAY DIFFRACTION 2.198Å
e4d8aA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 0HY,LYS,SO4 ; X-RAY DIFFRACTION 2.180Å
e4djdA1[A:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: B12,CA ; X-RAY DIFFRACTION 2.38Å
e2vefA1[A:7-303] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: PO4 ; X-RAY DIFFRACTION 1.8Å
e2dqwA1[A:14-287] Image Pymol Jmol Links: PDB, SCOP, CATH
DIHYDROPTEROATE SYNTHASE ; X-RAY DIFFRACTION 1.65Å
e2e7fA1[A:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-METHYLTETRAHYDROFOLATE CORRINOID/IRON SULFUR PROTEIN METHYLTRANSFERASE ; ligands: C2F,CA ; X-RAY DIFFRACTION 2.2Å
e2ogyA1[A:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: C2F,CA ; X-RAY DIFFRACTION 2.30Å
e2ogyB1[B:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: C2F,CA ; X-RAY DIFFRACTION 2.30Å
e2e7fB1[B:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-METHYLTETRAHYDROFOLATE CORRINOID/IRON SULFUR PROTEIN METHYLTRANSFERASE ; ligands: C2F,CA ; X-RAY DIFFRACTION 2.2Å
e2dqwB1[B:15-286] Image Pymol Jmol Links: PDB, SCOP, CATH
DIHYDROPTEROATE SYNTHASE ; X-RAY DIFFRACTION 1.65Å
e2vegA1[A:7-303] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: PMM,PO4 ; X-RAY DIFFRACTION 2.4Å
e2vefB1[B:6-302] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: PO4 ; X-RAY DIFFRACTION 1.8Å
e2vegB1[B:6-302] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; X-RAY DIFFRACTION 2.4Å
e2dzaA1[A:14-287] Image Pymol Jmol Links: PDB, SCOP, CATH
DIHYDROPTEROATE SYNTHASE ; X-RAY DIFFRACTION 1.9Å
e2dzaB1[B:15-286] Image Pymol Jmol Links: PDB, SCOP, CATH
DIHYDROPTEROATE SYNTHASE ; ligands: PAB ; X-RAY DIFFRACTION 1.9Å
e2dzbA1[A:14-287] Image Pymol Jmol Links: PDB, SCOP, CATH
DIHYDROPTEROATE SYNTHASE ; ligands: HH2 ; X-RAY DIFFRACTION 1.9Å
e2dzbB1[B:15-286] Image Pymol Jmol Links: PDB, SCOP, CATH
DIHYDROPTEROATE SYNTHASE ; ligands: HH2 ; X-RAY DIFFRACTION 1.9Å
e3h2aA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B57,SO4 ; X-RAY DIFFRACTION 2.4Å
e3h2cA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B58,SO4 ; X-RAY DIFFRACTION 2.4Å
e3h2mB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B61,SO4 ; X-RAY DIFFRACTION 2.31Å
e3h21B1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B52,SO4 ; X-RAY DIFFRACTION 2.32Å
e3h22A1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B53,SO4 ; X-RAY DIFFRACTION 2.31Å
e3h24B1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B55,SO4 ; X-RAY DIFFRACTION 2.4Å
e3h2eB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B59,SO4 ; X-RAY DIFFRACTION 2.0Å
e3h2oB1[B:1-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B63,SO4 ; X-RAY DIFFRACTION 2.61Å
e3h24A1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B55,SO4 ; X-RAY DIFFRACTION 2.4Å
e3h2eA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 2.0Å
e3h2fA1[A:1-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B60,SO4 ; X-RAY DIFFRACTION 2.2Å
e3h2mA1[A:1-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B61,SO4 ; X-RAY DIFFRACTION 2.31Å
e3h2nA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B62,SO4 ; X-RAY DIFFRACTION 2.4Å
e3h2nB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B62,SO4 ; X-RAY DIFFRACTION 2.4Å
e3h2oA1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B63,SO4 ; X-RAY DIFFRACTION 2.61Å
e3h23A1[A:2-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B54,SO4 ; X-RAY DIFFRACTION 2.1Å
e3h23B1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B54,SO4 ; X-RAY DIFFRACTION 2.1Å
e3h26A1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B56,SO4 ; X-RAY DIFFRACTION 2.5Å
e3h2cB1[B:-7-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B58,SO4 ; X-RAY DIFFRACTION 2.4Å
e3h2fB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: B60,SO4 ; X-RAY DIFFRACTION 2.2Å
e3tr9D1[D:12-293] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: PT1 ; X-RAY DIFFRACTION 1.895Å
e2y5sB1[B:2-292] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: 78H,CL,EDO ; X-RAY DIFFRACTION 1.95Å
e2y5sA1[A:3-292] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: 78H,CL,EDO ; X-RAY DIFFRACTION 1.95Å
e3tr9B1[B:12-293] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: CL,PT1 ; X-RAY DIFFRACTION 1.895Å
e3tr9C1[C:11-292] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: NA,PT1 ; X-RAY DIFFRACTION 1.895Å
e3tzfA1[A:-2-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; ligands: HH2,MG ; X-RAY DIFFRACTION 2.100Å
e3tyzA1[A:-2-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; ligands: MG,PAB,POP,XHP ; X-RAY DIFFRACTION 2.070Å
e3tzfB1[B:-2-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; ligands: 08D,HH2,MG ; X-RAY DIFFRACTION 2.100Å
e3tyzB1[B:-2-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; ligands: MG,PAB,POP,XHP ; X-RAY DIFFRACTION 2.070Å
e4hb7B1[B:-2-250] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: EDO ; X-RAY DIFFRACTION 1.900Å
e4djeA1[A:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: B12,C2F,CA ; X-RAY DIFFRACTION 3.50Å
e4djfB1[B:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: C2F,CA,COB ; X-RAY DIFFRACTION 3.03Å
e4djfA1[A:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: C2F,CA,COB ; X-RAY DIFFRACTION 3.03Å
e4djeB1[B:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: B12,C2F,CA ; X-RAY DIFFRACTION 3.50Å
e4djdB1[B:1-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate corrinoid/iron sulfur protein methyltransferase ; ligands: B12,CA ; X-RAY DIFFRACTION 2.38Å
e3tznB2[B:1-57,B:77-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; X-RAY DIFFRACTION 2.080Å
e3tyuB2[B:-1-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; ligands: PT1 ; X-RAY DIFFRACTION 2.700Å
e3mcoA3[A:165-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinase/dihydropteroate synthase ; ligands: PH2 ; X-RAY DIFFRACTION 2.3Å
e3tydB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: POP,SO4,XHP ; X-RAY DIFFRACTION 2.5Å
e3tyaB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: 78H,SO4 ; X-RAY DIFFRACTION 2.61Å
e3tydA2[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: POP,SO4,XHP ; X-RAY DIFFRACTION 2.5Å
e3tycB2[B:2-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: SO4,XHP ; X-RAY DIFFRACTION 2.3Å
e4d9pA2[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: SO4,Z17 ; X-RAY DIFFRACTION 2.26Å
e3tyeB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: SO4,XHP,YTZ ; X-RAY DIFFRACTION 2.3Å
e4d9pB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: SO4,Z17 ; X-RAY DIFFRACTION 2.26Å
e4d8aB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 0HY,LYS,SO4 ; X-RAY DIFFRACTION 2.180Å
e3tybB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: PHB,SO4,XHP ; X-RAY DIFFRACTION 2.6Å
e3tyeA2[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: SO4,XTZ ; X-RAY DIFFRACTION 2.3Å
e3v5oB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 2.5Å
e3tycA2[A:2-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: SO4,XHP ; X-RAY DIFFRACTION 2.3Å
e4dafB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 0J4,SO4 ; X-RAY DIFFRACTION 2.500Å
e4d8zB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 0J2,SO4 ; X-RAY DIFFRACTION 2.198Å
e3tybA2[A:1-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE ; ligands: PHB,SO4,XHP ; X-RAY DIFFRACTION 2.6Å
e3v5oA2[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 2.5Å
e4daiB2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 0J5,SO4 ; X-RAY DIFFRACTION 2.500Å
e4daiA2[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 0J5,SO4 ; X-RAY DIFFRACTION 2.500Å
e4dafA2[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 0J4,SO4 ; X-RAY DIFFRACTION 2.500Å
e4db7B2[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: SO4,Z25 ; X-RAY DIFFRACTION 2.500Å
e4db7A2[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: SO4,Z25 ; X-RAY DIFFRACTION 2.500Å
e3mcnA4[A:165-303,A:325-350,A:374-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinase/dihydropteroate synthase ; X-RAY DIFFRACTION 2.2Å
e4cczA3[A:351-651] Image Pymol Jmol Links: PDB, SCOP, CATH
METHIONINE SYNTHASE ; ligands: THG ; X-RAY DIFFRACTION 2.70Å
e3k13B2[B:350-636] Image Pymol Jmol Links: PDB, SCOP, CATH
5-methyltetrahydrofolate-homocysteine methyltransferase ; ligands: GOL,NA,THH ; X-RAY DIFFRACTION 2.000Å
e3k13C2[C:350-637] Image Pymol Jmol Links: PDB, SCOP, CATH
5-methyltetrahydrofolate-homocysteine methyltransferase ; ligands: GOL,NA,THH ; X-RAY DIFFRACTION 2.000Å
e3k13A2[A:350-636] Image Pymol Jmol Links: PDB, SCOP, CATH
5-methyltetrahydrofolate-homocysteine methyltransferase ; ligands: GOL,K,NA,THH ; X-RAY DIFFRACTION 2.000Å
e4nhvA1[A:1-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 2O6,SO4 ; X-RAY DIFFRACTION 1.99Å
e4nilA1[A:1-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 2O8,SO4 ; X-RAY DIFFRACTION 2.180Å
e4nilB1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 2O8,SO4 ; X-RAY DIFFRACTION 2.180Å
e4nirA1[A:1-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 6DH,SO4 ; X-RAY DIFFRACTION 1.770Å
e4nl1A1[A:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: SO4,Z13 ; X-RAY DIFFRACTION 2.300Å
e4nl1B1[B:2-274] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: SO4,Z13 ; X-RAY DIFFRACTION 2.300Å
e4nhvB1[B:2-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 2O6,SO4 ; X-RAY DIFFRACTION 1.99Å
e4nirB1[B:1-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate Synthase ; ligands: 6DH,SO4 ; X-RAY DIFFRACTION 1.770Å
e3tznA1[A:-1-275] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
7,8-dihydropteroate synthase ; X-RAY DIFFRACTION 2.080Å
e3mcmA2[A:146-422] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-amino-4-hydroxy-6-hydroxymethyldihydropteridine pyrophosphokinase/dihydropteroate synthase ; X-RAY DIFFRACTION 2.2Å
e2vp8A1[A:27-311] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE 2 ; ligands: EDO ; X-RAY DIFFRACTION 2.64Å
e2vp8B1[B:29-310] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
DIHYDROPTEROATE SYNTHASE 2 ; ligands: EDO ; X-RAY DIFFRACTION 2.64Å
e4o1eA1[A:-2-268] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase DHPS ; ligands: C2F ; X-RAY DIFFRACTION 1.600Å
e4o1fB1[B:1-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase DHPS ; ligands: THG ; X-RAY DIFFRACTION 1.800Å
e4o0qA1[A:-4-268] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase DHPS ; X-RAY DIFFRACTION 1.920Å
e4o1fA1[A:1-268] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase DHPS ; ligands: THG ; X-RAY DIFFRACTION 1.800Å
e4o0qB1[B:0-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase DHPS ; X-RAY DIFFRACTION 1.920Å
e4o1eB1[B:0-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase DHPS ; ligands: C2F ; X-RAY DIFFRACTION 1.600Å
e2yckX1[X:-8-263] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-METHYLTETRAHYDROFOLATE CORRINOID/IRON SULFUR PROTEIN METHYLTRANSFERASE ; ligands: GOL,SO4,THG ; X-RAY DIFFRACTION 2.15Å
e2yciX1[X:-7-263] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-METHYLTETRAHYDROFOLATE CORRINOID/IRON SULFUR PROTEIN METHYLTRANSFERASE ; ligands: SO4 ; X-RAY DIFFRACTION 1.78Å
e2ycjA1[A:-7-263] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-METHYLTETRAHYDROFOLATE CORRINOID/IRON SULFUR PROTEIN METHYLTRANSFERASE ; ligands: C2F,GOL,SO4 ; X-RAY DIFFRACTION 1.96Å
e5umgA1[A:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; X-RAY DIFFRACTION 2.600Å
e5umgB1[B:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: GOL ; X-RAY DIFFRACTION 2.600Å
e5uswA1[A:0-278] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: ACT,FMT,GOL ; X-RAY DIFFRACTION 1.64Å
e5uswB1[B:0-277] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: FMT,GOL ; X-RAY DIFFRACTION 1.64Å
e5uswC1[C:0-278] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: GOL ; X-RAY DIFFRACTION 1.64Å
e5uswD1[D:0-277] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: GOL ; X-RAY DIFFRACTION 1.64Å
e5visA1[A:-2-272] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate Synthase ; ligands: MLA,TAR ; X-RAY DIFFRACTION 1.73Å
e5visB1[B:-1-271] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate Synthase ; ligands: CL,GOL,K,MLA,TAR ; X-RAY DIFFRACTION 1.73Å
e5u0wB1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 9MG ; X-RAY DIFFRACTION 1.968Å
e5vonA1[A:367-648] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: GOL ; X-RAY DIFFRACTION 2.10Å
e5u0wA1[A:1-277,A:280-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 9MG,ACY ; X-RAY DIFFRACTION 1.968Å
e5u0yA1[A:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PJ,EDO ; X-RAY DIFFRACTION 1.879Å
e5u0zA1[A:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PM ; X-RAY DIFFRACTION 2.29Å
e5u10A1[A:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: PO4,PT1 ; X-RAY DIFFRACTION 2.04Å
e5u11A1[A:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PS ; X-RAY DIFFRACTION 1.99Å
e5u13A1[A:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: YH5 ; X-RAY DIFFRACTION 1.951Å
e5u14A1[A:1-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PV ; X-RAY DIFFRACTION 1.941Å
e5u0vA1[A:1-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7VJ,NA ; X-RAY DIFFRACTION 1.70Å
e5u0vB1[B:0-277] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7VJ,ACY,NA ; X-RAY DIFFRACTION 1.70Å
e5u0yB1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PJ,EDO ; X-RAY DIFFRACTION 1.879Å
e5u0zB1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PM ; X-RAY DIFFRACTION 2.29Å
e5u10B1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: PO4,PT1 ; X-RAY DIFFRACTION 2.04Å
e5u11B1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PS ; X-RAY DIFFRACTION 1.99Å
e5u12A1[A:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 5RU ; X-RAY DIFFRACTION 1.839Å
e5u12B1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 5RU ; X-RAY DIFFRACTION 1.839Å
e5u13B1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: YH5 ; X-RAY DIFFRACTION 1.951Å
e5u14B1[B:0-282] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 7PV ; X-RAY DIFFRACTION 1.941Å
e5v79A1[A:1-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 8Y4,NO3 ; X-RAY DIFFRACTION 2.25Å
e5v79B1[B:0-277] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 8Y4 ; X-RAY DIFFRACTION 2.25Å
e5v7aA1[A:1-276] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 8Y7 ; X-RAY DIFFRACTION 2.35Å
e5v7aB1[B:0-277] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 8Y7,CL ; X-RAY DIFFRACTION 2.35Å
e5vooA1[A:367-648] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,CL,NA ; X-RAY DIFFRACTION 2.40Å
e5vooB1[B:367-648] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,GOL,NA ; X-RAY DIFFRACTION 2.40Å
e5vooC1[C:366-647] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,CL,NA ; X-RAY DIFFRACTION 2.40Å
e5vooD1[D:367-646] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,NA,PEG ; X-RAY DIFFRACTION 2.40Å
e5vooE1[E:367-647] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,NA,PEG ; X-RAY DIFFRACTION 2.40Å
e5vooF1[F:367-646] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,NA ; X-RAY DIFFRACTION 2.40Å
e5vopA1[A:367-648] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,FLC,GOL,NA ; X-RAY DIFFRACTION 2.10Å
e5vopB1[B:367-648] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
5-methyltetrahydrofolate homocysteine S-methyltransferase ; ligands: C2F,GOL,NA ; X-RAY DIFFRACTION 2.10Å
e5uurA1[A:4-282] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: GOL,PAB,SO4
e5uurB1[B:4-282] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: GOL,PAB,SO4
e5uurC1[C:5-282] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: GOL,PAB,SO4
e5uurD1[D:5-282] Image Pymol Jmol Links: PDB, SCOP, CATH
; ligands: PAB,SO4
e6dayC1[C:3-282] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: GOL,PAB,SO4 ; X-RAY DIFFRACTION 1.65Å
e6dayD1[D:4-282] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: GOL,PAB,SO4 ; X-RAY DIFFRACTION 1.65Å
e6dayA1[A:5-282] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: PAB,SO4 ; X-RAY DIFFRACTION 1.65Å
e6dayB1[B:5-282] Image Pymol Jmol Links: PDB, SCOP, CATH
Dihydropteroate synthase ; ligands: PAB,SO4 ; X-RAY DIFFRACTION 1.65Å
e6cluB1[B:2-199,B:220-264] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; X-RAY DIFFRACTION 1.95Å
e6clvC1[C:2-264] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 6MB ; X-RAY DIFFRACTION 2.3Å
e5z79E1[E:329-588,E:657-716] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroxymethyldihydropterin pyrophosphokinase-dihydropteroate synthase, putative ; ligands: HH2,MG,PAB ; X-RAY DIFFRACTION 2.79Å
e6cluA1[A:2-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; X-RAY DIFFRACTION 1.95Å
e6cluC1[C:2-262] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; X-RAY DIFFRACTION 1.95Å
e6cluD1[D:2-263] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; X-RAY DIFFRACTION 1.95Å
e6clvA1[A:2-263] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 6MB ; X-RAY DIFFRACTION 2.3Å
e6clvB1[B:2-263] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; ligands: 6MB ; X-RAY DIFFRACTION 2.3Å
e6clvD1[D:2-264] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Dihydropteroate synthase ; X-RAY DIFFRACTION 2.3Å
e5z79A2[A:329-588,A:658-716] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroxymethyldihydropterin pyrophosphokinase-dihydropteroate synthase, putative ; ligands: HH2,MG,PAB ; X-RAY DIFFRACTION 2.79Å
e5z79B1[B:329-588,B:672-717] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Hydroxymethyldihydropterin pyrophosphokinase-dihydropteroate synthase, putative ; ligands: HH2,PAB ; X-RAY DIFFRACTION 2.79Å
Nexte3bofA2[A:301-560]
nonrep
Image
Pymol
Jmol Links:
PDB,
SCOP,
CATH, PubMed,
DOI
5-methyltetrahydrofolate S-homocysteine methyltransferase ; ligands: YT3 ; X-RAY DIFFRACTION 1.70Å

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-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