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
a/b three-layered sandwichesrepeating beta-alpha units form a sandwich with a mainly parallel beta-sheet layer stacked between two alpha-helix layers




Representatives:
e1q6zA3[A:342-524]
nonrep
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Benzoylformate decarboxylase ; ligands: CA,TZD ; X-RAY DIFFRACTION 1.0Å
e2ez9A3[A:366-593]
nonrep
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Pyruvate oxidase ; ligands: FAD,MG,NA,TDK ; X-RAY DIFFRACTION 1.60Å
e2c42A7[A:786-882,A:955-1232]
nonrep
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PYRUVATE-FERREDOXIN OXIDOREDUCTASE ; ligands: CA,MG,PYR,SF4,TPP ; X-RAY DIFFRACTION 1.78Å
e2ji7A3[A:370-552]
nonrep
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OXALYL-COA DECARBOXYLASE ; ligands: ADP,B3P,MG,OXT ; X-RAY DIFFRACTION 1.82Å
e1zpdA3[A:363-566]
nonrep
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PYRUVATE DECARBOXYLASE ; ligands: DPX,MG ; X-RAY DIFFRACTION 1.86Å
e1ozhA3[A:367-558]
nonrep
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ACETOLACTATE SYNTHASE, CATABOLIC ; ligands: HE3,MG,PEG,PO4 ; X-RAY DIFFRACTION 2.0Å
e2ihtA3[A:375-572]
nonrep
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CARBOXYETHYLARGININE SYNTHASE ; ligands: GOL,MG,SO4,TPP ; X-RAY DIFFRACTION 2.0Å
e1t9bA3[A:461-687]
nonrep
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Acetolactate synthase, mitochondrial ; ligands: 1CS,FAD,K,MG,P22,YF3 ; X-RAY DIFFRACTION 2.19Å
e1pvdA3[A:361-556]
nonrep
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PYRUVATE DECARBOXYLASE ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.30Å
e6hafA3[A:366-593] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Pyruvate oxidase ; ligands: FAD,GOL,K,MG,PO4,TDP ; X-RAY DIFFRACTION 1.300Å
e3hwwA2[A:365-556] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: AKG,GOL,MG,NA ; X-RAY DIFFRACTION 1.95Å
e6hafB2[B:366-593] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Pyruvate oxidase ; ligands: FAD,GOL,K,MG,PO4,TDP ; X-RAY DIFFRACTION 1.300Å
e6qsiA1[A:342-526] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Benzoylformate decarboxylase ; ligands: EDO,NA,TPP ; X-RAY DIFFRACTION 1.69Å
e6qsiB2[B:342-525] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Benzoylformate decarboxylase ; ligands: EDO,NA,TPP ; X-RAY DIFFRACTION 1.69Å
e5ej4A1[A:358-556] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: GOL,MN,TD6 ; X-RAY DIFFRACTION 1.77Å
e6vgsAAA3[AAA:332-548] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-keto acid decarboxylase ; ligands: MG,TPP ; X-RAY DIFFRACTION 1.800Å
e6u9dA1[A:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dF1[F:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dI1[I:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dJ3[J:461-685] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dQ3[Q:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dU3[U:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dB3[B:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dE2[E:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dM3[M:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dN3[N:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6u9dV2[V:461-687] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G,FAD,MG,TPP ; X-RAY DIFFRACTION 3.190Å
e6vgsBBB3[BBB:332-548] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-keto acid decarboxylase ; ligands: MG,TPP ; X-RAY DIFFRACTION 1.800Å
e6vgsCCC1[CCC:332-548] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-keto acid decarboxylase ; ligands: MG,TPP ; X-RAY DIFFRACTION 1.800Å
e6vgsDDD3[DDD:332-548] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Alpha-keto acid decarboxylase ; ligands: MG,TPP ; X-RAY DIFFRACTION 1.800Å
e6u9dR3[R:441-443,R:474-487,R:522-594,R:621-650] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase catalytic subunit, mitochondrial ; ligands: 60G ; X-RAY DIFFRACTION 3.190Å
e6lpiA2[A:366-560] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase isozyme 1 large subunit ; ligands: FAD,MG,TPP ; X-RAY DIFFRACTION 2.849Å
e6lpiB3[B:366-560] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase isozyme 1 large subunit ; ligands: FAD,MG,TPP ; X-RAY DIFFRACTION 2.849Å
e6lpiC3[C:366-560] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase isozyme 1 large subunit ; ligands: FAD,MG,TPP ; X-RAY DIFFRACTION 2.849Å
e6lpiD3[D:366-560] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase isozyme 1 large subunit ; ligands: FAD,MG,TPP ; X-RAY DIFFRACTION 2.849Å
e7b2eA1[A:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.800Å
e6m2yA3[A:342-526] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Benzoylformate decarboxylase ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.06Å
e7aygA3[A:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7aygB2[B:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7aygC3[C:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7aygD2[D:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7aygE1[E:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7aygF3[F:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7aygG2[G:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7aygH1[H:386-567] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 1.900Å
e7b2eB3[B:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.800Å
e7b2eC3[C:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 2.800Å
e7b2eD2[D:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: ADP,MG,TPP ; X-RAY DIFFRACTION 2.800Å
e7b2eE3[E:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.800Å
e7b2eF1[F:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.800Å
e7b2eG3[G:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.800Å
e7b2eH2[H:386-568] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Putative oxalyl-CoA decarboxylase (Oxc, yfdU) ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.800Å
e6m2zA1[A:342-526] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Benzoylformate decarboxylase ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.350Å
e7orxCCC3[CCC:343-528] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Probable benzoylformate decarboxylase ; ligands: NA,TPP ; X-RAY DIFFRACTION 2.6Å
e7eheA3[A:461-689] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase ; ligands: FAD,MG,TZD ; X-RAY DIFFRACTION 2.28Å
e6xn8B2[B:354-540] Image Pymol Jmol Links: PDB, SCOP, CATH
2-hydroxyacyl-CoA lyase 1 ; ligands: ADP,MG,TZD ; X-RAY DIFFRACTION 1.950Å
e6xn8A1[A:354-540] Image Pymol Jmol Links: PDB, SCOP, CATH
2-hydroxyacyl-CoA lyase 1 ; ligands: ADP,MG,TZD ; X-RAY DIFFRACTION 1.950Å
e7orxAAA1[AAA:343-528] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Probable benzoylformate decarboxylase ; ligands: NA,TPP ; X-RAY DIFFRACTION 2.6Å
e7orxBBB2[BBB:343-528] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Probable benzoylformate decarboxylase ; ligands: NA,TPP ; X-RAY DIFFRACTION 2.6Å
e7orxDDD3[DDD:343-528] Image Pymol Jmol Links: PDB, SCOP, CATHDOI
Probable benzoylformate decarboxylase ; ligands: NA,TPP ; X-RAY DIFFRACTION 2.6Å
e7egvA2[A:461-688] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase ; ligands: EDO,FAD,J3L,MG,SO4,TZD ; X-RAY DIFFRACTION 2.54Å
e7egvB3[B:461-669] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase ; ligands: EDO,FAD,MG,TZD ; X-RAY DIFFRACTION 2.54Å
e7eheB3[B:461-688] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase ; ligands: FAD,MG,TZD ; X-RAY DIFFRACTION 2.28Å
e7pt4B1[B:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: MG,OXT,SO4 ; X-RAY DIFFRACTION 1.640Å
e7plmA6[A:786-882,A:955-1230] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Pyruvate:ferredoxin oxidoreductase ; ligands: CA,MG,SF4,TPP ; ELECTRON MICROSCOPY
e7pt1A2[A:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: 3KK,MG,TPW ; X-RAY DIFFRACTION 1.553Å
e7pt3A3[A:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: 3KK,MG,TPW ; X-RAY DIFFRACTION 1.625Å
e7pt4A2[A:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: ACN,FYN,MG,SO4,TPP ; X-RAY DIFFRACTION 1.640Å
e7pt2A3[A:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: 3KK,MG,TPW ; X-RAY DIFFRACTION 1.762Å
e7plmB5[B:786-882,B:955-1230] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Pyruvate:ferredoxin oxidoreductase ; ligands: CA,MG,SF4,TPP ; ELECTRON MICROSCOPY
e7stqA2[A:460-667] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase, chloroplastic ; ligands: CIE,FAD,MG,SO4,TZD ; X-RAY DIFFRACTION 3.30Å
e7u1uA2[A:460-667] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase, chloroplastic ; ligands: FAD,MG,SO4,TPP ; X-RAY DIFFRACTION 3.22Å
e7tzzA2[A:460-667] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase, chloroplastic ; ligands: 6QL,AUJ,FAD,MG,PO4 ; X-RAY DIFFRACTION 2.59Å
e7u1dA1[A:460-667] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase, chloroplastic ; ligands: CIE,F50,FAD,MG,SO4,TP9 ; X-RAY DIFFRACTION 3.11Å
e7u25A3[A:460-667] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase, chloroplastic ; ligands: 6QL,FAD,MG,SO4,TZD ; X-RAY DIFFRACTION 3.19Å
e7pt1B1[B:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: 3KK,MG,TPW ; X-RAY DIFFRACTION 1.553Å
e7pt2B3[B:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: 3KK,MG,TPW ; X-RAY DIFFRACTION 1.762Å
e7pt3B3[B:379-561] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-hydroxyacyl-CoA lyase ; ligands: 3KK,MG,TPW ; X-RAY DIFFRACTION 1.625Å
e8et4A3[A:460-667] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase, chloroplastic ; ligands: AUJ,FAD,MG,SO4,TLA,WRQ ; X-RAY DIFFRACTION 2.95Å
e8et5A2[A:460-667] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
Acetolactate synthase, chloroplastic ; ligands: AUJ,FAD,MG,SO4,WRQ ; X-RAY DIFFRACTION 2.94Å
e3flmB5[B:358-470,B:494-556] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; X-RAY DIFFRACTION 2.70Å
e3hwwD5[D:358-471,D:493-556] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: AKG,GOL,MG,NA ; X-RAY DIFFRACTION 1.95Å
e7tinA1[A:357-556] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: CA,GLY,TPP ; X-RAY DIFFRACTION 2.350Å
e7tinB1[B:357-557] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: CA,CL,GLY,TPP ; X-RAY DIFFRACTION 2.350Å
e7tinC2[C:357-557] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: CA,GLY,TPP ; X-RAY DIFFRACTION 2.350Å
e7tinD3[D:357-554] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: CA,GLY,TPP ; X-RAY DIFFRACTION 2.350Å
Previouse3hwxA2[A:365-556]
nonrep
Image
Pymol
Jmol Links:
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SCOP,
CATH, PubMed,
DOI
2-succinyl-5-enolpyruvyl-6-hydroxy-3-cyclohexene-1-carboxylate synthase ; ligands: MG,TPP ; X-RAY DIFFRACTION 2.40Å

Pseudo group of domains that do not map to PFam family profiles. Domains inside should not be considered as in one family.
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