ID W6M6K0_9GAMM Unreviewed; 506 AA.
AC W6M6K0;
DT 16-APR-2014, integrated into UniProtKB/TrEMBL.
DT 16-APR-2014, sequence version 1.
DT 27-MAR-2024, entry version 43.
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 ECO:0000313|EMBL:CDI02244.1};
GN ORFNames=BN873_270040 {ECO:0000313|EMBL:CDI02244.1};
OS Candidatus Competibacter denitrificans Run_A_D11.
OC Bacteria; Pseudomonadota; Gammaproteobacteria;
OC Candidatus Competibacteraceae; Competibacter.
OX NCBI_TaxID=1400863 {ECO:0000313|EMBL:CDI02244.1, ECO:0000313|Proteomes:UP000035760};
RN [1] {ECO:0000313|EMBL:CDI02244.1, ECO:0000313|Proteomes:UP000035760}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Run_A_D11 {ECO:0000313|EMBL:CDI02244.1,
RC ECO:0000313|Proteomes:UP000035760};
RA McIlroy S.;
RL Submitted (JUL-2013) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:CDI02244.1, ECO:0000313|Proteomes:UP000035760}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Run_A_D11 {ECO:0000313|EMBL:CDI02244.1,
RC ECO:0000313|Proteomes:UP000035760};
RA McIlroy S.J., Albertsen M., Andresen E.K., Saunders A.M., Kristiansen R.,
RA Stokholm-Bjerregaard M., Nielsen K.L., Nielsen P.H.;
RT "Candidatus Competibacter-lineage genomes retrieved from metagenomes reveal
RT functional metabolic diversity.";
RL Submitted (FEB-2014) 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|RuleBase:RU362012}.
CC -!- SIMILARITY: Belongs to the serine/threonine dehydratase family.
CC {ECO:0000256|ARBA:ARBA00010869, ECO:0000256|RuleBase:RU362012}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:CDI02244.1}.
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DR EMBL; CBTJ020000033; CDI02244.1; -; Genomic_DNA.
DR RefSeq; WP_048672206.1; NZ_CBTJ020000033.1.
DR AlphaFoldDB; W6M6K0; -.
DR STRING; 1400863.BN873_270040; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000035760; Unassembled WGS sequence.
DR GO; GO:0016020; C:membrane; IEA:UniProtKB-KW.
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; cd04906; ACT_ThrD-I_1; 1.
DR CDD; cd04907; ACT_ThrD-I_2; 1.
DR CDD; cd01562; Thr-dehyd; 1.
DR Gene3D; 3.40.50.1100; -; 2.
DR InterPro; IPR045865; ACT-like_dom_sf.
DR InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR InterPro; IPR001721; TD_ACT-like.
DR InterPro; IPR038110; TD_ACT-like_sf.
DR InterPro; IPR005787; Thr_deHydtase_biosynth.
DR InterPro; IPR001926; TrpB-like_PALP.
DR InterPro; IPR036052; TrpB-like_PALP_sf.
DR NCBIfam; TIGR01124; ilvA_2Cterm; 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; 2.
DR SUPFAM; SSF55021; ACT-like; 2.
DR SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1.
DR PROSITE; PS51672; ACT_LIKE; 2.
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};
KW Lyase {ECO:0000256|RuleBase:RU362012, ECO:0000313|EMBL:CDI02244.1};
KW Membrane {ECO:0000256|SAM:Phobius};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000035760};
KW Repeat {ECO:0000256|ARBA:ARBA00022737};
KW Transmembrane {ECO:0000256|SAM:Phobius};
KW Transmembrane helix {ECO:0000256|SAM:Phobius}.
FT TRANSMEM 171..189
FT /note="Helical"
FT /evidence="ECO:0000256|SAM:Phobius"
FT DOMAIN 328..400
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 423..494
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 506 AA; 56422 MW; A4A6533EFFEDF757 CRC64;
MYDYIKKILT ARVYDVAIES PLEVMSRLSR RLNNRVLLKR EDLQPVFSFK LRGAYNKMAN
LPRAALEKGV ICASAGNHAQ GVALSAQRLG AKATIVMPRT TPAIKIQAVR DRGGKIVLFG
DNYDEAYQHA RQLEAEKGLT FIHPYDDPDV IAGQGTIGME ILRQHPDHIE AIFIAVGGGG
LIAGIAAFIK YLRPEIKIIG VEPDDAASMY QALKQDRRVV LDQVGIFADG VAVRQVGEET
FRLARERVDE MIVVSTDEIC AAIKDIFDDT RAIAEPAGAL GAAGLKKYVE RTGVTGANLI
ALNCGANINF DRLRHVAERA ELGERREALL AVTIPEQPGS FRRFCQTIGK RSITEFNYRY
ADTRQAQVFA GIQLTEGDGE KNRIIETLRE HSYPVLDLSD NEMAKLHIRY MVGGHAPGLR
DELLYRFEFP ERPGALLQFL TGMAHDWNIS LFHYRNHGSD HGRVLVGIQV STAERGQFDQ
FIHKLGYPYA DETDNPAYRL FLDSRG
//
