ID   LEU1_BLOPB              Reviewed;         517 AA.
AC   Q493R0;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   13-SEP-2005, sequence version 1.
DT   03-AUG-2022, entry version 99.
DE   RecName: Full=2-isopropylmalate synthase {ECO:0000255|HAMAP-Rule:MF_01025};
DE            EC=2.3.3.13 {ECO:0000255|HAMAP-Rule:MF_01025};
DE   AltName: Full=Alpha-IPM synthase {ECO:0000255|HAMAP-Rule:MF_01025};
DE   AltName: Full=Alpha-isopropylmalate synthase {ECO:0000255|HAMAP-Rule:MF_01025};
GN   Name=leuA {ECO:0000255|HAMAP-Rule:MF_01025}; OrderedLocusNames=BPEN_137;
OS   Blochmannia pennsylvanicus (strain BPEN).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; ant endosymbionts; Candidatus Blochmannia.
OX   NCBI_TaxID=291272;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=BPEN;
RX   PubMed=16077009; DOI=10.1101/gr.3771305;
RA   Degnan P.H., Lazarus A.B., Wernegreen J.J.;
RT   "Genome sequence of Blochmannia pennsylvanicus indicates parallel
RT   evolutionary trends among bacterial mutualists of insects.";
RL   Genome Res. 15:1023-1033(2005).
CC   -!- FUNCTION: Catalyzes the condensation of the acetyl group of acetyl-CoA
CC       with 3-methyl-2-oxobutanoate (2-oxoisovalerate) to form 3-carboxy-3-
CC       hydroxy-4-methylpentanoate (2-isopropylmalate). {ECO:0000255|HAMAP-
CC       Rule:MF_01025}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=3-methyl-2-oxobutanoate + acetyl-CoA + H2O = (2S)-2-
CC         isopropylmalate + CoA + H(+); Xref=Rhea:RHEA:21524, ChEBI:CHEBI:1178,
CC         ChEBI:CHEBI:11851, ChEBI:CHEBI:15377, ChEBI:CHEBI:15378,
CC         ChEBI:CHEBI:57287, ChEBI:CHEBI:57288; EC=2.3.3.13;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01025};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-leucine biosynthesis; L-leucine
CC       from 3-methyl-2-oxobutanoate: step 1/4. {ECO:0000255|HAMAP-
CC       Rule:MF_01025}.
CC   -!- SUBUNIT: Homotetramer. {ECO:0000255|HAMAP-Rule:MF_01025}.
CC   -!- SIMILARITY: Belongs to the alpha-IPM synthase/homocitrate synthase
CC       family. LeuA type 1 subfamily. {ECO:0000255|HAMAP-Rule:MF_01025}.
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DR   EMBL; CP000016; AAZ40777.1; -; Genomic_DNA.
DR   RefSeq; WP_011282684.1; NC_007292.1.
DR   AlphaFoldDB; Q493R0; -.
DR   SMR; Q493R0; -.
DR   STRING; 291272.BPEN_137; -.
DR   EnsemblBacteria; AAZ40777; AAZ40777; BPEN_137.
DR   KEGG; bpn:BPEN_137; -.
DR   eggNOG; COG0119; Bacteria.
DR   HOGENOM; CLU_022158_0_1_6; -.
DR   OMA; NTMRMLV; -.
DR   BioCyc; CBLO291272:BPEN_RS00670-MON; -.
DR   UniPathway; UPA00048; UER00070.
DR   Proteomes; UP000007794; Chromosome.
DR   GO; GO:0003852; F:2-isopropylmalate synthase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0009098; P:leucine biosynthetic process; IEA:UniProtKB-UniRule.
DR   Gene3D; 3.20.20.70; -; 1.
DR   Gene3D; 3.30.160.270; -; 1.
DR   HAMAP; MF_01025; LeuA_type1; 1.
DR   InterPro; IPR013709; 2-isopropylmalate_synth_dimer.
DR   InterPro; IPR002034; AIPM/Hcit_synth_CS.
DR   InterPro; IPR013785; Aldolase_TIM.
DR   InterPro; IPR036230; LeuA_allosteric_dom_sf.
DR   InterPro; IPR005671; LeuA_bact_synth.
DR   InterPro; IPR000891; PYR_CT.
DR   Pfam; PF00682; HMGL-like; 1.
DR   Pfam; PF08502; LeuA_dimer; 1.
DR   SMART; SM00917; LeuA_dimer; 1.
DR   SUPFAM; SSF110921; SSF110921; 1.
DR   TIGRFAMs; TIGR00973; leuA_bact; 1.
DR   PROSITE; PS00815; AIPM_HOMOCIT_SYNTH_1; 1.
DR   PROSITE; PS00816; AIPM_HOMOCIT_SYNTH_2; 1.
DR   PROSITE; PS50991; PYR_CT; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; Branched-chain amino acid biosynthesis;
KW   Leucine biosynthesis; Transferase.
FT   CHAIN           1..517
FT                   /note="2-isopropylmalate synthase"
FT                   /id="PRO_1000149140"
FT   DOMAIN          5..267
FT                   /note="Pyruvate carboxyltransferase"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01151"
SQ   SEQUENCE   517 AA;  57500 MW;  83BAE68F5ADB789C CRC64;
     MSQQVIIFDT TLRDGEQALQ ASLNVKEKLQ IAFALERLGV DIMEVGFPIS SPGDFESVHT
     IAQKIKNSLV CALARCIDND IDVAAEALKV AKNFRIHIFL PTSNVHIQSK LKKNFDQIID
     MTVHAIRYAR KYTDDIEFSC EDAGRTNIDN LCRIVEIAIQ SGASTINIPD TVGYTTPYQF
     GQIITSLYNR VPIIDKAIIS VHCHDDLGMA VGNSISAIQA GARQIEGTIN GIGERAGNTA
     LEEIIMAIKV REDLLNVHTN VRCQEIYRAS QVVSQLCNIP IPANKAIVGS NAFSHSAGIH
     QDGILKNRKN YEIMTPETIG LKDVKLNLTS RSGRAAVKHH MKTMGYQESD YDMDKLYDVF
     LELADKKGQV FDYDLEALAF INNQQEQSEF FRLKCFHVDS SSSEVAHASV KLYCGNNTYT
     HSSSGNGPID AIYEALTHIS KLSINLERYQ LNAKGHGRNA LGQVDIVVSY EGRNFHGVGL
     DTDVIKSSVK AMIHVLNNIW RAKQVIIQRK YIKKNNN