ID L0IC89_HALRX Unreviewed; 419 AA.
AC L0IC89;
DT 06-MAR-2013, integrated into UniProtKB/TrEMBL.
DT 06-MAR-2013, sequence version 1.
DT 27-MAR-2024, entry version 54.
DE RecName: Full=Ketol-acid reductoisomerase (NADP(+)) {ECO:0000256|HAMAP-Rule:MF_00435};
DE Short=KARI {ECO:0000256|HAMAP-Rule:MF_00435};
DE EC=1.1.1.86 {ECO:0000256|HAMAP-Rule:MF_00435};
DE AltName: Full=Acetohydroxy-acid isomeroreductase {ECO:0000256|HAMAP-Rule:MF_00435};
DE Short=AHIR {ECO:0000256|HAMAP-Rule:MF_00435};
DE AltName: Full=Alpha-keto-beta-hydroxylacyl reductoisomerase {ECO:0000256|HAMAP-Rule:MF_00435};
GN Name=ilvC {ECO:0000256|HAMAP-Rule:MF_00435};
GN OrderedLocusNames=Halru_2611 {ECO:0000313|EMBL:AGB17190.1};
OS Halovivax ruber (strain DSM 18193 / JCM 13892 / XH-70).
OC Archaea; Euryarchaeota; Stenosarchaea group; Halobacteria; Natrialbales;
OC Natrialbaceae; Halovivax.
OX NCBI_TaxID=797302 {ECO:0000313|EMBL:AGB17190.1, ECO:0000313|Proteomes:UP000010846};
RN [1] {ECO:0000313|Proteomes:UP000010846}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=DSM 18193 / JCM 13892 / XH-70
RC {ECO:0000313|Proteomes:UP000010846};
RA Lucas S., Han J., Lapidus A., Cheng J.-F., Goodwin L., Pitluck S.,
RA Peters L., Mikhailova N., Davenport K., Detter J.C., Han C., Tapia R.,
RA Land M., Hauser L., Kyrpides N., Ivanova N., Pagani I., Sproer C.,
RA Anderson I., Woyke T.;
RT "Complete sequence of Halovivax ruber XH-70.";
RL Submitted (SEP-2011) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Involved in the biosynthesis of branched-chain amino acids
CC (BCAA). Catalyzes an alkyl-migration followed by a ketol-acid reduction
CC of (S)-2-acetolactate (S2AL) to yield (R)-2,3-dihydroxy-isovalerate. In
CC the isomerase reaction, S2AL is rearranged via a Mg-dependent methyl
CC migration to produce 3-hydroxy-3-methyl-2-ketobutyrate (HMKB). In the
CC reductase reaction, this 2-ketoacid undergoes a metal-dependent
CC reduction by NADPH to yield (R)-2,3-dihydroxy-isovalerate.
CC {ECO:0000256|HAMAP-Rule:MF_00435}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=(2R)-2,3-dihydroxy-3-methylbutanoate + NADP(+) = (2S)-2-
CC acetolactate + H(+) + NADPH; Xref=Rhea:RHEA:22068, ChEBI:CHEBI:15378,
CC ChEBI:CHEBI:49072, ChEBI:CHEBI:57783, ChEBI:CHEBI:58349,
CC ChEBI:CHEBI:58476; EC=1.1.1.86; Evidence={ECO:0000256|HAMAP-
CC Rule:MF_00435};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=(2R,3R)-2,3-dihydroxy-3-methylpentanoate + NADP(+) = (S)-2-
CC ethyl-2-hydroxy-3-oxobutanoate + H(+) + NADPH; Xref=Rhea:RHEA:13493,
CC ChEBI:CHEBI:15378, ChEBI:CHEBI:49256, ChEBI:CHEBI:49258,
CC ChEBI:CHEBI:57783, ChEBI:CHEBI:58349; EC=1.1.1.86;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00435};
CC -!- COFACTOR:
CC Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC Evidence={ECO:0000256|HAMAP-Rule:MF_00435};
CC Note=Binds 2 magnesium ions per subunit. {ECO:0000256|HAMAP-
CC Rule:MF_00435};
CC -!- PATHWAY: Amino-acid biosynthesis; L-isoleucine biosynthesis; L-
CC isoleucine from 2-oxobutanoate: step 2/4.
CC {ECO:0000256|ARBA:ARBA00004885, ECO:0000256|HAMAP-Rule:MF_00435}.
CC -!- PATHWAY: Amino-acid biosynthesis; L-valine biosynthesis; L-valine from
CC pyruvate: step 2/4. {ECO:0000256|ARBA:ARBA00004864, ECO:0000256|HAMAP-
CC Rule:MF_00435}.
CC -!- SIMILARITY: Belongs to the ketol-acid reductoisomerase family.
CC {ECO:0000256|ARBA:ARBA00010318, ECO:0000256|HAMAP-Rule:MF_00435,
CC ECO:0000256|PROSITE-ProRule:PRU01198}.
CC -!- CAUTION: Lacks conserved residue(s) required for the propagation of
CC feature annotation. {ECO:0000256|HAMAP-Rule:MF_00435}.
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DR EMBL; CP003050; AGB17190.1; -; Genomic_DNA.
DR AlphaFoldDB; L0IC89; -.
DR STRING; 797302.Halru_2611; -.
DR KEGG; hru:Halru_2611; -.
DR eggNOG; arCOG04465; Archaea.
DR HOGENOM; CLU_033821_0_1_2; -.
DR UniPathway; UPA00047; UER00056.
DR UniPathway; UPA00049; UER00060.
DR Proteomes; UP000010846; Chromosome.
DR GO; GO:0016853; F:isomerase activity; IEA:UniProtKB-KW.
DR GO; GO:0004455; F:ketol-acid reductoisomerase 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; 6.10.240.10; -; 1.
DR Gene3D; 3.40.50.720; NAD(P)-binding Rossmann-like Domain; 1.
DR HAMAP; MF_00435; IlvC; 1.
DR InterPro; IPR008927; 6-PGluconate_DH-like_C_sf.
DR InterPro; IPR013023; KARI.
DR InterPro; IPR000506; KARI_C.
DR InterPro; IPR013116; KARI_N.
DR InterPro; IPR036291; NAD(P)-bd_dom_sf.
DR NCBIfam; TIGR00465; ilvC; 1.
DR PANTHER; PTHR21371; KETOL-ACID REDUCTOISOMERASE, MITOCHONDRIAL; 1.
DR PANTHER; PTHR21371:SF1; KETOL-ACID REDUCTOISOMERASE, MITOCHONDRIAL; 1.
DR Pfam; PF01450; IlvC; 1.
DR Pfam; PF07991; IlvN; 1.
DR SUPFAM; SSF48179; 6-phosphogluconate dehydrogenase C-terminal domain-like; 1.
DR SUPFAM; SSF51735; NAD(P)-binding Rossmann-fold domains; 1.
DR PROSITE; PS51851; KARI_C; 1.
DR PROSITE; PS51850; KARI_N; 1.
PE 3: Inferred from homology;
KW Amino-acid biosynthesis {ECO:0000256|ARBA:ARBA00022605, ECO:0000256|HAMAP-
KW Rule:MF_00435};
KW Branched-chain amino acid biosynthesis {ECO:0000256|ARBA:ARBA00023304,
KW ECO:0000256|HAMAP-Rule:MF_00435}; Isomerase {ECO:0000313|EMBL:AGB17190.1};
KW Magnesium {ECO:0000256|HAMAP-Rule:MF_00435, ECO:0000256|PROSITE-
KW ProRule:PRU01198};
KW Metal-binding {ECO:0000256|HAMAP-Rule:MF_00435, ECO:0000256|PROSITE-
KW ProRule:PRU01198}; NADP {ECO:0000256|HAMAP-Rule:MF_00435};
KW Oxidoreductase {ECO:0000256|ARBA:ARBA00023002, ECO:0000256|HAMAP-
KW Rule:MF_00435}; Reference proteome {ECO:0000313|Proteomes:UP000010846}.
FT DOMAIN 89..269
FT /note="KARI N-terminal Rossmann"
FT /evidence="ECO:0000259|PROSITE:PS51850"
FT DOMAIN 270..412
FT /note="KARI C-terminal knotted"
FT /evidence="ECO:0000259|PROSITE:PS51851"
FT REGION 1..81
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 1..20
FT /note="Polar residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 21..39
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 48..77
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 195
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435"
FT BINDING 112..115
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435"
FT BINDING 135
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435"
FT BINDING 138
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435"
FT BINDING 140
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435"
FT BINDING 221
FT /ligand="NADP(+)"
FT /ligand_id="ChEBI:CHEBI:58349"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435"
FT BINDING 278
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435,
FT ECO:0000256|PROSITE-ProRule:PRU01198"
FT BINDING 278
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435,
FT ECO:0000256|PROSITE-ProRule:PRU01198"
FT BINDING 282
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="1"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435,
FT ECO:0000256|PROSITE-ProRule:PRU01198"
FT BINDING 314
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435,
FT ECO:0000256|PROSITE-ProRule:PRU01198"
FT BINDING 318
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_label="2"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435,
FT ECO:0000256|PROSITE-ProRule:PRU01198"
FT BINDING 339
FT /ligand="substrate"
FT /evidence="ECO:0000256|HAMAP-Rule:MF_00435,
FT ECO:0000256|PROSITE-ProRule:PRU01198"
SQ SEQUENCE 419 AA; 45856 MW; 82D168B38626275F CRC64;
MTRTHPQHDT TTTHATDSGR TNHEQTVERM AERRAERTTV TVTGRTAGET DPDDRTATDE
AVEASTERTK RCLTDGGTDV ADESPSFDAT VYYERDADRH ALDDETVAVL GYGSQGHAHA
QNLAESGVDV VVGLRADSSS WTAAEEDGLR VATPDEAAAQ ASVVSVLLPD TVQPAVYEEA
IEPTLEPGDT LQFAHGFNVH YNQIQPPEGV DVTMIAPKSP GHLVRRNYEN GQGTPGLLAI
YQDATGEARE QALAYADALG CTRAGVVETT FREETETDLF GEQAVLCGGV TELVKAGFET
LVDAGYAPEM AYFECLNELK LIVDLLYEGG HMEMWNSVSD TAEYGGLTRG ESVVDREGMD
EILQNVQNGE FAREWISENQ ANRPAYTQYR RAEETHEIER VGAELRTLFA WDEDAEGER
//
