ID ILVD_CHLCH Reviewed; 559 AA. AC Q3APB9; DT 07-MAR-2006, integrated into UniProtKB/Swiss-Prot. DT 22-NOV-2005, sequence version 1. DT 04-NOV-2026, entry version 104. 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=Cag_1906; OS Chlorobium chlorochromatii (strain CaD3). OC Bacteria; Pseudomonadati; Chlorobiota; Chlorobiia; Chlorobiales; OC Chlorobiaceae; Chlorobium/Pelodictyon group; Chlorobium. OX NCBI_TaxID=340177; RN [1] RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA]. RC STRAIN=CaD3; RG US DOE Joint Genome Institute; RA Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C., Glavina T., RA Hammon N., Israni S., Pitluck S., Bryant D., Schmutz J., Larimer F., RA Land M., Kyrpides N., Ivanova N., Richardson P.; RT "Complete sequence of Chlorobium chlorochromatii CaD3."; RL Submitted (AUG-2005) 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}. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR EMBL; CP000108; ABB29156.1; -; Genomic_DNA. DR AlphaFoldDB; Q3APB9; -. DR SMR; Q3APB9; -. DR STRING; 340177.Cag_1906; -. DR KEGG; cch:Cag_1906; -. DR eggNOG; COG0129; Bacteria. DR HOGENOM; CLU_014271_4_2_10; -. DR OMA; AADDHYS; -. DR OrthoDB; 9807077at2; -. DR UniPathway; UPA00047; UER00057. DR UniPathway; UPA00049; UER00061. 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. FT CHAIN 1..559 FT /note="Dihydroxy-acid dehydratase" FT /id="PRO_0000225382" 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 559 AA; 58691 MW; 0683F9E2FAB7B5ED CRC64; MRSDTIKSGF EKAPHRSLLK ATGAIRSSSD YRKPFIGICN SYNELIPGHT HLQELGRIAK EAVREAGGVP FEFNTIGVCD GIAMGHIGMR YSLASRELIA DSVETVAEAH RLDGLVCIPN CDKITPGMMM AALRINIPVI FVSGGPMKAG HTPEGKTVDL ISVFEAVGQC SNGSITEGEL QNIEEHACPG CGSCSGMFTA NSMNCLSEAL GFALPGNGTI VAEDPRRLEL VKAASRRIVD LVENNVRPRD ILTRQALLNA FALDFAMGGS TNTILHTLAI ANEAGLSFDF SELNALSAKT PYICQVSPAT MAVHIEDVDR AGGISAILKE LSSIDGLLDL SAITVTGKTL GENIANAEVL DRSVIRSISD PYSATGGLAV LYGNLAPQGA VVKTGAVSPQ MMQHSGPAKV YNAQDDAIKG IMEGDVKAGD VVVIRYEGPK GGPGMPEMLS PTSAIMGRGL GDSVALITDG RFSGGSRGAC IGHVSPEAAE RGPIAALQNG DIITIDIPAR TMSVALSEST IKERLAQLPP FEPKIKRGYL ARYAQLVTSA NTGAILGHL //