ID LEU3_BUCDN Reviewed; 363 AA.
AC O85071;
DT 19-OCT-2002, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1998, sequence version 1.
DT 13-SEP-2023, entry version 101.
DE RecName: Full=3-isopropylmalate dehydrogenase {ECO:0000255|HAMAP-Rule:MF_01033};
DE EC=1.1.1.85 {ECO:0000255|HAMAP-Rule:MF_01033};
DE AltName: Full=3-IPM-DH {ECO:0000255|HAMAP-Rule:MF_01033};
DE AltName: Full=Beta-IPM dehydrogenase {ECO:0000255|HAMAP-Rule:MF_01033};
DE Short=IMDH {ECO:0000255|HAMAP-Rule:MF_01033};
GN Name=leuB {ECO:0000255|HAMAP-Rule:MF_01033};
OS Buchnera aphidicola subsp. Diuraphis noxia.
OG Plasmid pLeu-Dn (pBDn1).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Enterobacterales;
OC Erwiniaceae; Buchnera.
OX NCBI_TaxID=118101;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=9873079; DOI=10.1007/pl00006447;
RA Baumann L., Baumann P., Moran N.A., Sandstroem J.P., Thao M.L.;
RT "Genetic characterization of plasmids containing genes encoding enzymes of
RT leucine biosynthesis in endosymbionts (Buchnera) of aphids.";
RL J. Mol. Evol. 48:77-85(1999).
CC -!- FUNCTION: Catalyzes the oxidation of 3-carboxy-2-hydroxy-4-
CC methylpentanoate (3-isopropylmalate) to 3-carboxy-4-methyl-2-
CC oxopentanoate. The product decarboxylates to 4-methyl-2 oxopentanoate.
CC {ECO:0000255|HAMAP-Rule:MF_01033}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=(2R,3S)-3-isopropylmalate + NAD(+) = 4-methyl-2-oxopentanoate
CC + CO2 + NADH; Xref=Rhea:RHEA:32271, ChEBI:CHEBI:16526,
CC ChEBI:CHEBI:17865, ChEBI:CHEBI:35121, ChEBI:CHEBI:57540,
CC ChEBI:CHEBI:57945; EC=1.1.1.85; Evidence={ECO:0000255|HAMAP-
CC Rule:MF_01033};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01033};
CC Name=Mn(2+); Xref=ChEBI:CHEBI:29035;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01033};
CC Note=Binds 1 Mg(2+) or Mn(2+) ion per subunit. {ECO:0000255|HAMAP-
CC Rule:MF_01033};
CC -!- PATHWAY: Amino-acid biosynthesis; L-leucine biosynthesis; L-leucine
CC from 3-methyl-2-oxobutanoate: step 3/4. {ECO:0000255|HAMAP-
CC Rule:MF_01033}.
CC -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01033}.
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_01033}.
CC -!- SIMILARITY: Belongs to the isocitrate and isopropylmalate
CC dehydrogenases family. LeuB type 1 subfamily. {ECO:0000255|HAMAP-
CC Rule:MF_01033}.
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DR EMBL; AF041837; AAD12601.1; -; Genomic_DNA.
DR RefSeq; NP_047188.1; NC_001911.1.
DR AlphaFoldDB; O85071; -.
DR SMR; O85071; -.
DR UniPathway; UPA00048; UER00072.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0003862; F:3-isopropylmalate dehydrogenase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0000287; F:magnesium ion binding; IEA:InterPro.
DR GO; GO:0051287; F:NAD binding; IEA:InterPro.
DR GO; GO:0009098; P:leucine biosynthetic process; IEA:UniProtKB-UniRule.
DR Gene3D; 3.40.718.10; Isopropylmalate Dehydrogenase; 1.
DR HAMAP; MF_01033; LeuB_type1; 1.
DR InterPro; IPR019818; IsoCit/isopropylmalate_DH_CS.
DR InterPro; IPR024084; IsoPropMal-DH-like_dom.
DR InterPro; IPR004429; Isopropylmalate_DH.
DR NCBIfam; TIGR00169; leuB; 1.
DR PANTHER; PTHR42979; 3-ISOPROPYLMALATE DEHYDROGENASE; 1.
DR PANTHER; PTHR42979:SF1; 3-ISOPROPYLMALATE DEHYDROGENASE; 1.
DR Pfam; PF00180; Iso_dh; 1.
DR SMART; SM01329; Iso_dh; 1.
DR SUPFAM; SSF53659; Isocitrate/Isopropylmalate dehydrogenase-like; 1.
DR PROSITE; PS00470; IDH_IMDH; 1.
PE 3: Inferred from homology;
KW Amino-acid biosynthesis; Branched-chain amino acid biosynthesis; Cytoplasm;
KW Leucine biosynthesis; Magnesium; Manganese; Metal-binding; NAD;
KW Oxidoreductase; Plasmid.
FT CHAIN 1..363
FT /note="3-isopropylmalate dehydrogenase"
FT /id="PRO_0000083657"
FT BINDING 78..91
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 99
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 109
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 138
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 227
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 227
FT /ligand="substrate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 251
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 255
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT BINDING 285..297
FT /ligand="NAD(+)"
FT /ligand_id="ChEBI:CHEBI:57540"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT SITE 145
FT /note="Important for catalysis"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
FT SITE 195
FT /note="Important for catalysis"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01033"
SQ SEQUENCE 363 AA; 41056 MW; C4B5F8B3E4F00735 CRC64;
MHKQYHIAVL PGDGIGPEVM QEAYKILQVL REHFSLFIKT KEFDIGGIAI DNHGIALPKK
TLIGCENSDA ILLGSIGGKK WDTLPINERP ERASLLPLRK HFNFFCNLRP SNLYKELNFL
SPLRNDIVKH GFDILCVREL TGGIYFGKPR GRVTKKKLMY AFDTEIYYKF EIVRIAHLAF
KLARSRKHKL CSIDKANVLE SSILWREVVE EVSKEYPDVI LSHLYIDNVC MQIIKDPNQF
DVLLCSNLFG DIISDECAMI TGSIGMLPSA SLNEKNFGLY EPAGGSAPDI QGKNIANPIA
QILSLSMLIR YSMNLNKIAN KIDNAVINVL KKGYKTMDIS KDQNYLKTNE MGDVIADFLK
RDK
//
