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ILVD_BUCAT
ID   ILVD_BUCAT              Reviewed;         617 AA.
AC   B8D8B5;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   03-MAR-2009, sequence version 1.
DT   03-AUG-2022, entry version 64.
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=BUAPTUC7_593;
OS   Buchnera aphidicola subsp. Acyrthosiphon pisum (strain Tuc7).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Erwiniaceae; Buchnera.
OX   NCBI_TaxID=561501;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=Tuc7;
RX   PubMed=19150844; DOI=10.1126/science.1167140;
RA   Moran N.A., McLaughlin H.J., Sorek R.;
RT   "The dynamics and time scale of ongoing genomic erosion in symbiotic
RT   bacteria.";
RL   Science 323:379-382(2009).
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;
CC         Evidence={ECO:0000255|HAMAP-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; CP001158; ACL30380.1; -; Genomic_DNA.
DR   RefSeq; WP_009874548.1; NC_011834.1.
DR   AlphaFoldDB; B8D8B5; -.
DR   SMR; B8D8B5; -.
DR   KEGG; bau:BUAPTUC7_593; -.
DR   HOGENOM; CLU_014271_4_2_6; -.
DR   OMA; TQGRNMA; -.
DR   UniPathway; UPA00047; UER00057.
DR   UniPathway; UPA00049; UER00061.
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:0009097; P:isoleucine biosynthetic process; IEA:UniProtKB-UniRule.
DR   GO; GO:0009099; P:valine biosynthetic process; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.50.30.80; -; 1.
DR   HAMAP; MF_00012; IlvD; 1.
DR   InterPro; IPR042096; Dihydro-acid_dehy_C.
DR   InterPro; IPR004404; DihydroxyA_deHydtase.
DR   InterPro; IPR000581; DiOHA_6PGluconate_deHydtase.
DR   InterPro; IPR020558; DiOHA_6PGluconate_deHydtase_CS.
DR   InterPro; IPR037237; IlvD/EDD_N.
DR   Pfam; PF00920; ILVD_EDD; 1.
DR   SUPFAM; SSF143975; SSF143975; 1.
DR   TIGRFAMs; TIGR00110; ilvD; 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..617
FT                   /note="Dihydroxy-acid dehydratase"
FT                   /id="PRO_1000190654"
FT   ACT_SITE        517
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         81
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         122
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         123
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         124
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         195
FT                   /ligand="[2Fe-2S] cluster"
FT                   /ligand_id="ChEBI:CHEBI:190135"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   BINDING         491
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
FT   MOD_RES         124
FT                   /note="N6-carboxylysine"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_00012"
SQ   SEQUENCE   617 AA;  67356 MW;  CF73637CC71365FB CRC64;
     MPKYRSFTTT QGRNMSGARS LWRATGMTEK DFTKPIIAVV NSFSQFVPGH IHLQEVGKLI
     CGEIQKSGGV AKEFNTIAID DGIAMGHSGM LYSLPSRELI ADSIEYVVNA HCADAMICIS
     NCDKITPGML MASLRLNIPS VFISGGPMEA GKIQKNNKTI KIDLVDAIIN GGKSHISDDF
     IKDIEASACP TCGSCSGMFT ANSMNCLTEA IGLALPGNGT LLATHIDRKN LFIKSAQIIV
     KITEDYYKKN NTNVLPRNIA NKESFENAMM LDIAMGGSTN TILHLLAAAQ EAKVDFKMSN
     INKLSKKIPH ICKVAPSTSL YHVEDVHRAG GVMGILGELN RFNLLHKNTR NILQLNLEET
     LDEYDIFSTN NPDVINMFQA GPGGIRTTKA YSQNFRWTRL DYDRKNGCIR SCKHAYSQDG
     GLAILYGNLA KNGCIIKTAG IDAKNYIFSG VAKVYESQEE AASSILNGEI ISGDIIVIRY
     EGPKGGPGMQ EMLYPTTYLK SMNLDKTCAL ITDGRFSGGT SGISIGHISP EAANKGIIAL
     VKNGDIININ IPERTIHLNI TEKELSHRIL QEESKGPLSY KPHSRKRYIS SALKAYAFFS
     TSADQGAVRD YKKISNI
 
 
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