ID H8KQS5_SOLCM Unreviewed; 417 AA.
AC H8KQS5;
DT 16-MAY-2012, integrated into UniProtKB/TrEMBL.
DT 16-MAY-2012, sequence version 1.
DT 27-MAR-2024, entry version 59.
DE RecName: Full=L-threonine dehydratase {ECO:0000256|RuleBase:RU362012};
DE EC=4.3.1.19 {ECO:0000256|RuleBase:RU362012};
DE AltName: Full=Threonine deaminase {ECO:0000256|RuleBase:RU362012};
GN Name=ilvA {ECO:0000256|RuleBase:RU362012};
GN OrderedLocusNames=Solca_1885 {ECO:0000313|EMBL:AFD06946.1};
OS Solitalea canadensis (strain ATCC 29591 / DSM 3403 / NBRC 15130 / NCIMB
OS 12057 / USAM 9D) (Flexibacter canadensis).
OC Bacteria; Bacteroidota; Sphingobacteriia; Sphingobacteriales;
OC Sphingobacteriaceae; Solitalea.
OX NCBI_TaxID=929556 {ECO:0000313|EMBL:AFD06946.1, ECO:0000313|Proteomes:UP000007590};
RN [1] {ECO:0000313|Proteomes:UP000007590}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 29591 / DSM 3403 / NBRC 15130 / NCIMB 12057 / USAM 9D
RC {ECO:0000313|Proteomes:UP000007590};
RA Lucas S., Copeland A., Lapidus A., Glavina del Rio T., Dalin E., Tice H.,
RA Bruce D., Goodwin L., Pitluck S., Peters L., Ovchinnikova G., Lu M.,
RA Kyrpides N., Mavromatis K., Ivanova N., Brettin T., Detter J.C., Han C.,
RA Larimer F., Land M., Hauser L., Markowitz V., Cheng J.-F., Hugenholtz P.,
RA Woyke T., Wu D., Spring S., Schroeder M., Kopitz M., Brambilla E.,
RA Klenk H.-P., Eisen J.A.;
RT "The complete genome of Solitalea canadensis DSM 3403.";
RL Submitted (FEB-2012) to the EMBL/GenBank/DDBJ databases.
CC -!- FUNCTION: Catalyzes the anaerobic formation of alpha-ketobutyrate and
CC ammonia from threonine in a two-step reaction. The first step involved
CC a dehydration of threonine and a production of enamine intermediates
CC (aminocrotonate), which tautomerizes to its imine form (iminobutyrate).
CC Both intermediates are unstable and short-lived. The second step is the
CC nonenzymatic hydrolysis of the enamine/imine intermediates to form 2-
CC ketobutyrate and free ammonia. In the low water environment of the
CC cell, the second step is accelerated by RidA.
CC {ECO:0000256|ARBA:ARBA00025527, ECO:0000256|RuleBase:RU362012}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=L-threonine = 2-oxobutanoate + NH4(+); Xref=Rhea:RHEA:22108,
CC ChEBI:CHEBI:16763, ChEBI:CHEBI:28938, ChEBI:CHEBI:57926; EC=4.3.1.19;
CC Evidence={ECO:0000256|ARBA:ARBA00001274,
CC ECO:0000256|RuleBase:RU362012};
CC -!- COFACTOR:
CC Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC Evidence={ECO:0000256|ARBA:ARBA00001933,
CC ECO:0000256|RuleBase:RU362012};
CC -!- PATHWAY: Amino-acid biosynthesis; L-isoleucine biosynthesis; 2-
CC oxobutanoate from L-threonine: step 1/1.
CC {ECO:0000256|ARBA:ARBA00004810, ECO:0000256|RuleBase:RU362012}.
CC -!- SUBUNIT: Homotetramer. {ECO:0000256|ARBA:ARBA00011881,
CC ECO:0000256|RuleBase:RU362012}.
CC -!- SIMILARITY: Belongs to the serine/threonine dehydratase family.
CC {ECO:0000256|ARBA:ARBA00010869, ECO:0000256|RuleBase:RU362012}.
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DR EMBL; CP003349; AFD06946.1; -; Genomic_DNA.
DR RefSeq; WP_014680173.1; NC_017770.1.
DR AlphaFoldDB; H8KQS5; -.
DR STRING; 929556.Solca_1885; -.
DR KEGG; scn:Solca_1885; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_4_2_10; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000007590; Chromosome.
DR GO; GO:0004794; F:L-threonine ammonia-lyase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0030170; F:pyridoxal phosphate binding; IEA:InterPro.
DR GO; GO:0009097; P:isoleucine biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd01562; Thr-dehyd; 1.
DR Gene3D; 3.40.50.1100; -; 2.
DR InterPro; IPR045865; ACT-like_dom_sf.
DR InterPro; IPR011820; IlvA.
DR InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR InterPro; IPR001721; TD_ACT-like.
DR InterPro; IPR038110; TD_ACT-like_sf.
DR InterPro; IPR001926; TrpB-like_PALP.
DR InterPro; IPR036052; TrpB-like_PALP_sf.
DR NCBIfam; TIGR02079; THD1; 1.
DR PANTHER; PTHR48078:SF11; THREONINE DEHYDRATASE, MITOCHONDRIAL; 1.
DR PANTHER; PTHR48078; THREONINE DEHYDRATASE, MITOCHONDRIAL-RELATED; 1.
DR Pfam; PF00291; PALP; 1.
DR Pfam; PF00585; Thr_dehydrat_C; 1.
DR SUPFAM; SSF55021; ACT-like; 1.
DR SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1.
DR PROSITE; PS51672; ACT_LIKE; 1.
DR PROSITE; PS00165; DEHYDRATASE_SER_THR; 1.
PE 3: Inferred from homology;
KW Amino-acid biosynthesis {ECO:0000256|RuleBase:RU362012};
KW Branched-chain amino acid biosynthesis {ECO:0000256|ARBA:ARBA00023304,
KW ECO:0000256|RuleBase:RU362012};
KW Isoleucine biosynthesis {ECO:0000256|ARBA:ARBA00022624,
KW ECO:0000256|RuleBase:RU362012}; Lyase {ECO:0000256|RuleBase:RU362012};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000007590}.
FT DOMAIN 334..408
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 417 AA; 46400 MW; E83B018FF05DE80D CRC64;
MQTTTSNVTE QISLAAERLN GVALKTPLQY ISRLSEKYDC KMYFKREDMQ PVRSYKIRGA
YNNIIGLSDE QRSRGVVCAS AGNHAQGVAF SSSKLKIKSH IFMPQVTPRQ KIEKVRSFGG
EWVNVVLTGT TYDEAYAASK RFAEQNNLAF IHPFDDWNTI YGQATVAKEI DDELQDFDVL
VVPVGGGGLA SGASLFFKEI NPNVKVIGID PEGAPKMIAA LKEGKPVRLE SIDTFIDGAA
VKQIGDLTFR LASENIDEFL TVHEGKVCTT MIELYQNEGI ITEPAGALSV AALDKLAPQL
KGKKVVCVIS GGNNDIARYP EVIERSLIYE GLKHYFIVEF AQKPGELRNF LNDALGPNDD
IVHFQYLKKT NKEFGPALVG IELASKADLE PLLFRFRQNH INYINVNDHE MLRKYLV
//
