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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

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

X: TIM beta/alpha-barrel
H: TIM barrels
T: TIM barrels
F: IGPS

PF00218 CL0036

Representatives:

e1vc4A1[A:1-254] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-Glycerol Phosphate Synthase ; ligands: ACY,SO4 ; X-RAY DIFFRACTION 1.8Å

e1a53A1[A:2-248] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROLPHOSPHATE SYNTHASE ; ligands: IGP ; X-RAY DIFFRACTION 2.0Å

e1i4nA1[A:2-252] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.5Å

e1piiA2[A:1-254] nonrep Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

N-(5'PHOSPHORIBOSYL)ANTHRANILATE ISOMERASE ; ligands: PO4 ; X-RAY DIFFRACTION

e5an7A1[A:1002-1249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RA95.5-8F ; ligands: LLK,PO4 ; X-RAY DIFFRACTION 1.10Å

e5aouA1[A:1002-2249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: EDO,PO4 ; X-RAY DIFFRACTION 1.10Å

e1jcmP1[P:1-254] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL-PHOSPHATE SYNTHASE ; ligands: 137,PO4 ; X-RAY DIFFRACTION 2.10Å

e1jukA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.5Å

e1julA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: MES ; X-RAY DIFFRACTION 2.0Å

e1lbfA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: 137 ; X-RAY DIFFRACTION 2.05Å

e1lblA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: 137 ; X-RAY DIFFRACTION 2.4Å

e1igsA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROLPHOSPHATE SYNTHASE ; ligands: PO4 ; X-RAY DIFFRACTION 2.0Å

e1j5tA1[A:-3-230] Image Pymol Jmol Links: PDB, SCOP, CATH

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: CL ; X-RAY DIFFRACTION 3.000Å

e1i4nB1[B:2-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.5Å

e1vc4B1[B:1-254] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-Glycerol Phosphate Synthase ; ligands: ACY,GOL,SO4 ; X-RAY DIFFRACTION 1.8Å

e3qjaA1[A:4-270] Image Pymol Jmol Links: PDB, SCOP, CATH

Indole-3-glycerol phosphate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 1.290Å

e3tsmA1[A:4-264] Image Pymol Jmol Links: PDB, SCOP, CATH

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: GOL,UNL ; X-RAY DIFFRACTION 2.15Å

e3hojA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RETROALDOLASE-22 ; X-RAY DIFFRACTION 2.200Å

e3tc6A1[A:2-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: PEG,PO4 ; X-RAY DIFFRACTION 1.6Å

e3tc7A1[A:2-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: ACY,PO4 ; X-RAY DIFFRACTION 1.5Å

e3ud6A1[A:2-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RETRO-ALDOLASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.09Å

e3uz5A1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R13 3/11H ; ligands: 0CU,NA,PO4 ; X-RAY DIFFRACTION 1.9Å

e3uxaA1[A:1-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R1 7/10H ; ligands: PO4 ; X-RAY DIFFRACTION 2.5Å

e3uy7A1[A:1-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R1 7/10H ; ligands: NA,SO4 ; X-RAY DIFFRACTION 1.45Å

e4a29A1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

ENGINEERED RETRO-ALDOL ENZYME RA95.0 ; ligands: 3NK,MLT ; X-RAY DIFFRACTION 1.100Å

e4ijbA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH

ENGINEERED PROTEIN OR288 ; X-RAY DIFFRACTION 1.74Å

e4fb7A1[A:4-270] Image Pymol Jmol Links: PDB, SCOP, CATH

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: BTB ; X-RAY DIFFRACTION 1.3Å

e2c3zA1[A:29-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: SO4 ; X-RAY DIFFRACTION 2.8Å

e3nyzA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 1.51Å

e3tsmB1[B:5-264] Image Pymol Jmol Links: PDB, SCOP, CATH

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: GOL,SO4,UNL ; X-RAY DIFFRACTION 2.15Å

e3nxfA1[A:2-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Retro-Aldolase ; ligands: SO4 ; X-RAY DIFFRACTION 2.09Å

e3o6yX1[X:2-249] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Retro-Aldolase ; ligands: SO4 ; X-RAY DIFFRACTION 2.09Å

e3nyzB1[B:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: SO4 ; X-RAY DIFFRACTION 1.51Å

e3nz1A1[A:2-250] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 3NY,SO4,TLA ; X-RAY DIFFRACTION 1.560Å

e3uy8B1[B:2-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R5_11/5F ; ligands: SO4 ; X-RAY DIFFRACTION 2.41Å

e3uzjA1[A:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R13 3/11H ; ligands: 0CT,PO4 ; X-RAY DIFFRACTION 1.69Å

e3uy8A1[A:2-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R5_11/5F ; ligands: SO4 ; X-RAY DIFFRACTION 2.41Å

e3uycB1[B:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R8_2/7A ; ligands: PO4 ; X-RAY DIFFRACTION 2.2Å

e3uxdB1[B:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R1 7/10H ; ligands: 0CU,PO4 ; X-RAY DIFFRACTION 1.8Å

e3uy7B1[B:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R1 7/10H ; ligands: SO4 ; X-RAY DIFFRACTION 1.45Å

e3uzjB1[B:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R13 3/11H ; ligands: 0CT,PO4 ; X-RAY DIFFRACTION 1.69Å

e3uycA1[A:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R8_2/7A ; ligands: PO4 ; X-RAY DIFFRACTION 2.2Å

e3uxaB1[B:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R1 7/10H ; ligands: PO4 ; X-RAY DIFFRACTION 2.5Å

e3uz5B1[B:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R13 3/11H ; ligands: 0CU,NA,PO4 ; X-RAY DIFFRACTION 1.9Å

e3uxdA1[A:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

KEMP ELIMINASE KE59 R1 7/10H ; ligands: 0CU,PO4 ; X-RAY DIFFRACTION 1.8Å

e4a2rA1[A:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: 3NK ; X-RAY DIFFRACTION 1.30Å

e4a2sA1[A:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: 3NK ; X-RAY DIFFRACTION 1.40Å

e3t55A1[A:1-263] Image Pymol Jmol Links: PDB, SCOP, CATH

INDOLE-3-GLYCEROL PHOSPHATE SYNTHASE ; ligands: 4RG,MLI,SO4 ; X-RAY DIFFRACTION 2.06Å

e3t78A1[A:1-263] Image Pymol Jmol Links: PDB, SCOP, CATH

Indole-3-glycerol phosphate synthase ; ligands: 5RG,ACT,MLI ; X-RAY DIFFRACTION 1.600Å

e3t44A1[A:4-270] Image Pymol Jmol Links: PDB, SCOP, CATH

Indole-3-glycerol phosphate synthase ; ligands: BE2,IGP ; X-RAY DIFFRACTION 1.600Å

e3t40A1[A:5-269] Image Pymol Jmol Links: PDB, SCOP, CATH

Indole-3-glycerol phosphate synthase ; ligands: 3RG,SO4 ; X-RAY DIFFRACTION 1.750Å

e4lnyA1[A:2-249] Image Pymol Jmol Links: PDB, SCOP, CATH

ENGINEERED PROTEIN OR422 ; ligands: CD,CL ; X-RAY DIFFRACTION 1.93Å

e4lt9A1[A:2-259] Image Pymol Jmol Links: PDB, SCOP, CATH

ENGINEERED PROTEIN OR404 ; X-RAY DIFFRACTION 2.15Å

e4iwwA1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UNNATURAL AMINO ACID MEDIATED METALLOPROTEIN ; ligands: CO,SO4 ; X-RAY DIFFRACTION 2.3Å

e4iwwB1[B:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

UNNATURAL AMINO ACID MEDIATED METALLOPROTEIN ; ligands: CO,SO4 ; X-RAY DIFFRACTION 2.3Å

e4ix0A1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Unnatural Amino Acid Mediated Metalloprotein ; ligands: NI,SO4 ; X-RAY DIFFRACTION 2.5Å

e4ou1A1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RETRO-ALDOLASE, DESIGN RA114 ; ligands: 2V7,BEZ,PO4 ; X-RAY DIFFRACTION 1.25Å

e4pa8A1[A:1002-1247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

retro-aldolase ; ligands: 2K6,GOL,SO4 ; X-RAY DIFFRACTION 1.200Å

e4pekA1[A:2-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Retro-aldolase ; X-RAY DIFFRACTION 1.60Å

e5k7jB1[B:1-247] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: ZN ; X-RAY DIFFRACTION 1.39Å

e6bmaA1[A:0-258] Image Pymol Jmol Links: PDB, SCOP, CATH

Indole-3-glycerol phosphate synthase ; ligands: ACT,CL,EDO,K,PO4 ; X-RAY DIFFRACTION 1.98Å

e6bmaB1[B:0-258] Image Pymol Jmol Links: PDB, SCOP, CATH

Indole-3-glycerol phosphate synthase ; ligands: ACT,CL,FMT,K,PO4 ; X-RAY DIFFRACTION 1.98Å

e6nw4A1[A:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 6NT,SO4 ; X-RAY DIFFRACTION 3.000Å

e6tf8A1[A:2-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RA95.5-8F_133F ; X-RAY DIFFRACTION 1.9Å

e6tf8B1[B:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RA95.5-8F_133F ; X-RAY DIFFRACTION 1.9Å

e6tf8C1[C:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RA95.5-8F_133F ; X-RAY DIFFRACTION 1.9Å

e6tf8D1[D:2-251] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

RA95.5-8F_133F ; X-RAY DIFFRACTION 1.9Å

e6tfaA1[A:2-252] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

F112L RA95.5-8F ; X-RAY DIFFRACTION 2.16Å

e6tfaB1[B:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

F112L RA95.5-8F ; X-RAY DIFFRACTION 2.16Å

e6tfaC1[C:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

F112L RA95.5-8F ; X-RAY DIFFRACTION 2.16Å

e6tfaD1[D:2-248] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

F112L RA95.5-8F ; X-RAY DIFFRACTION 2.16Å

e6y88A1[A:3-266] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 137,GOL ; X-RAY DIFFRACTION 2.099Å

e6y88B1[B:2-266] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 137,GOL ; X-RAY DIFFRACTION 2.099Å

e6y88C1[C:2-265] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 137,GOL ; X-RAY DIFFRACTION 2.099Å

e6y88E1[E:2-266] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 137,CIT,GOL ; X-RAY DIFFRACTION 2.099Å

e6y88F1[F:2-266] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 137 ; X-RAY DIFFRACTION 2.099Å

e6y88H1[H:2-265] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 137,GOL ; X-RAY DIFFRACTION 2.099Å

e6y88D1[D:4-268] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase ; ligands: 137 ; X-RAY DIFFRACTION 2.099Å

e6y88G1[G:9-267] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Indole-3-glycerol phosphate synthase,Indole-3-glycerol phosphate synthase ; ligands: PO4 ; X-RAY DIFFRACTION 2.099Å

e7etxA1[A:4-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tryptophan biosynthesis protein TrpCF ; ligands: GOL ; X-RAY DIFFRACTION 2.100Å

e7etyA1[A:6-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tryptophan biosynthesis protein TrpCF ; ligands: 137,GOL ; X-RAY DIFFRACTION 2.200Å

e7etyB1[B:5-260] Image Pymol Jmol Links: PDB, SCOP, CATH, PubMed, DOI

Tryptophan biosynthesis protein TrpCF ; ligands: 137,GOL ; X-RAY DIFFRACTION 2.200Å

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-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