ID A0A2D2M752_9PSED Unreviewed; 520 AA.
AC A0A2D2M752;
DT 31-JAN-2018, integrated into UniProtKB/TrEMBL.
DT 31-JAN-2018, sequence version 1.
DT 24-JAN-2024, entry version 27.
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:ATR83312.1};
GN ORFNames=CS390_12525 {ECO:0000313|EMBL:ATR83312.1};
OS Pseudomonas sp. HLS-6.
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Pseudomonadales;
OC Pseudomonadaceae; Pseudomonas.
OX NCBI_TaxID=2049589 {ECO:0000313|EMBL:ATR83312.1, ECO:0000313|Proteomes:UP000230810};
RN [1] {ECO:0000313|EMBL:ATR83312.1, ECO:0000313|Proteomes:UP000230810}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=HLS-6 {ECO:0000313|EMBL:ATR83312.1,
RC ECO:0000313|Proteomes:UP000230810};
RA Hu Y., Zhang T., Lei D., Yao S., Lin K., Chen X., Cui C.;
RT "Complete genome of Pseudomonas sp. HSL-6, a multiple-antibiotic-resistant
RT bacteria isolated from drinking water source in East China.";
RL Submitted (OCT-2017) 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}.
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DR EMBL; CP024478; ATR83312.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A2D2M752; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000230810; 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; 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:ATR83312.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000230810};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 345..417
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 440..511
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 520 AA; 56110 MW; 1412C1D8F32EEB58 CRC64;
MTSLTACPSV PTVLTTMLSD YVRRILAAPV YDLAIETPLQ SARALSAALG NEVLLKREDL
QPTFSFKIRG AYTRLSALTA AQRASGVVTA SAGNHAQGVA LAARELAMTA TIVMPTTTPE
LKVEGVRSRG GHVVLHGDSF PQALAHALTL ADTEGMTFVP PFDDPDVIAG QGTVAMEILR
QQPGNLDAIF VPVGGGGLIA GIAAYVKYLR PQVKVIGVEP ADSNCLQAAM AAGERVVLSQ
VGSFADGVAV AQIGAHCFDV CRHFVDEVIT VGNDEICAAI KDIYDDTRSI TEPSGALAVA
GIKRYVASRG VTGQTLVAID SGANVNFDRL RHVAERAELG EQREAIIAVT IPEQPGSFRA
FCQALGKRQI TEFNYRYYPG KEARLFVGVQ THPQRDPRAQ LLASLRDQGY SVLDLTDNEL
AKLHIRHTVG GHAGPGANER VLRFEFPERP GALLAFLERL GKRWNISLFH YRNHGAAEAR
VFTALEVPEE ERAELPAMLD AIGYRYWDET DNPAYQLFLG
//
