ID   ILVD_CHLT3              Reviewed;         560 AA.
AC   B3QSP3;
DT   24-MAR-2009, integrated into UniProtKB/Swiss-Prot.
DT   02-SEP-2008, sequence version 1.
DT   02-SEP-2026, entry version 85.
DE   RecName: Full=Dihydroxy-acid dehydratase {ECO:0000255|HAMAP-Rule:MF_00012};
DE            Short=DAD {ECO:0000255|HAMAP-Rule:MF_00012};
DE            EC=4.2.1.9 {ECO:0000255|HAMAP-Rule:MF_00012};
GN   Name=ilvD {ECO:0000255|HAMAP-Rule:MF_00012};
GN   OrderedLocusNames=Ctha_1632;
OS   Chloroherpeton thalassium (strain ATCC 35110 / GB-78).
OC   Bacteria; Pseudomonadati; Chlorobiota; Chlorobiia; Chlorobiales;
OC   Chloroherpetonaceae; Chloroherpeton.
OX   NCBI_TaxID=517418;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 35110 / GB-78;
RG   US DOE Joint Genome Institute;
RA   Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA   Bruce D., Goodwin L., Pitluck S., Schmutz J., Larimer F., Land M.,
RA   Hauser L., Kyrpides N., Mikhailova N., Liu Z., Li T., Zhao F., Overmann J.,
RA   Bryant D.A., Richardson P.;
RT   "Complete sequence of Chloroherpeton thalassium ATCC 35110.";
RL   Submitted (JUN-2008) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Functions in the biosynthesis of branched-chain amino acids.
CC       Catalyzes the dehydration of (2R,3R)-2,3-dihydroxy-3-methylpentanoate
CC       (2,3-dihydroxy-3-methylvalerate) into 2-oxo-3-methylpentanoate (2-oxo-
CC       3-methylvalerate) and of (2R)-2,3-dihydroxy-3-methylbutanoate (2,3-
CC       dihydroxyisovalerate) into 2-oxo-3-methylbutanoate (2-oxoisovalerate),
CC       the penultimate precursor to L-isoleucine and L-valine, respectively.
CC       {ECO:0000255|HAMAP-Rule:MF_00012}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(2R)-2,3-dihydroxy-3-methylbutanoate = 3-methyl-2-oxobutanoate
CC         + H2O; Xref=Rhea:RHEA:24809, ChEBI:CHEBI:11851, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:49072; EC=4.2.1.9; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00012};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:24810;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00012};
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=(2R,3R)-2,3-dihydroxy-3-methylpentanoate = (S)-3-methyl-2-
CC         oxopentanoate + H2O; Xref=Rhea:RHEA:27694, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:35146, ChEBI:CHEBI:49258; EC=4.2.1.9;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00012};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:27695;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00012};
CC   -!- COFACTOR:
CC       Name=[2Fe-2S] cluster; Xref=ChEBI:CHEBI:190135;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_00012};
CC       Note=Binds 1 [2Fe-2S] cluster per subunit. This cluster acts as a Lewis
CC       acid cofactor. {ECO:0000255|HAMAP-Rule:MF_00012};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_00012};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-isoleucine biosynthesis; L-
CC       isoleucine from 2-oxobutanoate: step 3/4. {ECO:0000255|HAMAP-
CC       Rule:MF_00012}.
CC   -!- PATHWAY: Amino-acid biosynthesis; L-valine biosynthesis; L-valine from
CC       pyruvate: step 3/4. {ECO:0000255|HAMAP-Rule:MF_00012}.
CC   -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_00012}.
CC   -!- SIMILARITY: Belongs to the IlvD/Edd family. {ECO:0000255|HAMAP-
CC       Rule:MF_00012}.
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DR   EMBL; CP001100; ACF14090.1; -; Genomic_DNA.
DR   RefSeq; WP_012500174.1; NC_011026.1.
DR   AlphaFoldDB; B3QSP3; -.
DR   SMR; B3QSP3; -.
DR   STRING; 517418.Ctha_1632; -.
DR   KEGG; cts:Ctha_1632; -.
DR   eggNOG; COG0129; Bacteria.
DR   HOGENOM; CLU_014271_4_2_10; -.
DR   OrthoDB; 9807077at2; -.
DR   UniPathway; UPA00047; UER00057.
DR   UniPathway; UPA00049; UER00061.
DR   Proteomes; UP000001208; Chromosome.
DR   GO; GO:0005829; C:cytosol; IEA:TreeGrafter.
DR   GO; GO:0051537; F:2 iron, 2 sulfur cluster binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0004160; F:dihydroxy-acid dehydratase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0009099; P:L-valine biosynthetic process; IEA:UniProtKB-UniRule.
DR   FunFam; 3.50.30.80:FF:000001; Dihydroxy-acid dehydratase; 1.
DR   Gene3D; 3.50.30.80; IlvD/EDD C-terminal domain-like; 1.
DR   HAMAP; MF_00012; IlvD; 1.
DR   InterPro; IPR042096; Dihydro-acid_dehy_C.
DR   InterPro; IPR004404; DihydroxyA_deHydtase.
DR   InterPro; IPR020558; DiOHA_6PGluconate_deHydtase_CS.
DR   InterPro; IPR056740; ILV_EDD_C.
DR   InterPro; IPR000581; ILV_EDD_N.
DR   InterPro; IPR037237; IlvD/EDD_N.
DR   NCBIfam; TIGR00110; ilvD; 1.
DR   NCBIfam; NF002068; PRK00911.1; 1.
DR   PANTHER; PTHR43661; D-XYLONATE DEHYDRATASE; 1.
DR   PANTHER; PTHR43661:SF3; D-XYLONATE DEHYDRATASE YAGF-RELATED; 1.
DR   Pfam; PF24877; ILV_EDD_C; 1.
DR   Pfam; PF00920; ILVD_EDD_N; 1.
DR   SUPFAM; SSF143975; IlvD/EDD N-terminal domain-like; 1.
DR   SUPFAM; SSF52016; LeuD/IlvD-like; 1.
DR   PROSITE; PS00886; ILVD_EDD_1; 1.
DR   PROSITE; PS00887; ILVD_EDD_2; 1.
PE   3: Inferred from homology;
KW   2Fe-2S; Amino-acid biosynthesis; Branched-chain amino acid biosynthesis;
KW   Iron; Iron-sulfur; Lyase; Magnesium; Metal-binding; Reference proteome.
FT   CHAIN           1..560
FT                   /note="Dihydroxy-acid dehydratase"
FT                   /id="PRO_1000089375"
FT   ACT_SITE        473
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         80
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         121
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         122
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         123
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /note="via carbamate group"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         194
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         447
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   MOD_RES         123
FT                   /note="N6-carboxylysine"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
SQ   SEQUENCE   560 AA;  59118 MW;  248541FFEFBD7899 CRC64;
     MRSDKIKLGF DKAPHRSLLK ATGAIQSDED FQKPFIGIAN SYIDIIPGHV HLHDFAKRIK
     EAVRKAGGIP FEFNTIGVDD GIAMGHIGMR YSLASRELIA DAVETVVGAH WLDAMICIPN
     CDKIVPGMMM AAVRLDIPTI FISGGPMKVG VMADGEKVDL ISVFEGVGEY SSGKIDDARL
     KELENNGCPT CGSCSGMFTA NSMNCLAEAL GLALPGNGTI LAVDPKREAL AEAAAKQIMT
     LVEKDIKPSD LLSRESFLNA FALDLAMGGS TNTILHTLAI ANEAGINFDL AELNTLAAKT
     PYICKVSPAT KNVHIEDVDR AGGISAILKE LSKLDGVLDL SRPTVTGKTL GENIADAEVK
     DKAVIHSVED PYSATGGLAV LFGNLAPQGC VVKTGAVDPK MMQHTGPARI YESQDEAISG
     ILKGDVQAGE VVVIRYEGPK GGPGMPEMLA PTSTIMGQGL GDKVALITDG RFSGGTRGAC
     IGHVSPEAAE RGPIAALQNG DKITIDIPNK RIAVDLSDEE IEARLKALPP FEPKIKRGYL
     ARYSQMVTSA GSGAVLKSFD
//