ID Q87YJ0_PSESM Unreviewed; 507 AA.
AC Q87YJ0;
DT 01-JUN-2003, integrated into UniProtKB/TrEMBL.
DT 01-JUN-2003, sequence version 1.
DT 27-MAR-2024, entry version 127.
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-1 {ECO:0000313|EMBL:AAO57275.1};
GN Synonyms=ilvA {ECO:0000256|RuleBase:RU362012};
GN OrderedLocusNames=PSPTO_3806 {ECO:0000313|EMBL:AAO57275.1};
OS Pseudomonas syringae pv. tomato (strain ATCC BAA-871 / DC3000).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Pseudomonadales;
OC Pseudomonadaceae; Pseudomonas.
OX NCBI_TaxID=223283 {ECO:0000313|EMBL:AAO57275.1, ECO:0000313|Proteomes:UP000002515};
RN [1] {ECO:0000313|EMBL:AAO57275.1, ECO:0000313|Proteomes:UP000002515}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC BAA-871 / DC3000 {ECO:0000313|Proteomes:UP000002515};
RX PubMed=12928499; DOI=10.1073/pnas.1731982100;
RA Buell C.R., Joardar V., Lindeberg M., Selengut J., Paulsen I.T.,
RA Gwinn M.L., Dodson R.J., Deboy R.T., Durkin A.S., Kolonay J.F., Madupu R.,
RA Daugherty S., Brinkac L., Beanan M.J., Haft D.H., Nelson W.C., Davidsen T.,
RA Zafar N., Zhou L., Liu J., Yuan Q., Khouri H., Fedorova N., Tran B.,
RA Russell D., Berry K., Utterback T., Van Aken S.E., Feldblyum T.V.,
RA D'Ascenzo M., Deng W.L., Ramos A.R., Alfano J.R., Cartinhour S.,
RA Chatterjee A.K., Delaney T.P., Lazarowitz S.G., Martin G.B.,
RA Schneider D.J., Tang X., Bender C.L., White O., Fraser C.M., Collmer A.;
RT "The complete genome sequence of the Arabidopsis and tomato pathogen
RT Pseudomonas syringae pv. tomato DC3000.";
RL Proc. Natl. Acad. Sci. U.S.A. 100:10181-10186(2003).
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; AE016853; AAO57275.1; -; Genomic_DNA.
DR RefSeq; NP_793580.1; NC_004578.1.
DR AlphaFoldDB; Q87YJ0; -.
DR STRING; 223283.PSPTO_3806; -.
DR KEGG; pst:PSPTO_3806; -.
DR PATRIC; fig|223283.9.peg.3903; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_6_2_6; -.
DR OrthoDB; 9811476at2; -.
DR PhylomeDB; Q87YJ0; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000002515; 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}; Lyase {ECO:0000256|RuleBase:RU362012};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000002515};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 332..404
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 427..498
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 507 AA; 55457 MW; 9B6C55871C64488D CRC64;
MTDLLNHYAR KILTSRVYDV AVETPLHGAR QLSERLGNQV LLKREDLQPV FSFKIRGAYN
KLAQLTAEEA ARGVVTASAG NHAQGLALAA KELGILATIV MPRTTPEIKV EGVRSRGATV
VLHGDSFPEA LAYSLKLVEQ QGFVYIHPYD DPDTIAGQGT VAMEILRQQP GKLDAIFVPV
GGGGLIAGIA AYVKYLRPEI KVIGVEPDDS NCLQAAMAAG ERVVLSQVGL FADGVAVAQI
GYHTFEVCRH YVDEVITVST DEICAAIKDI YDDTRSITEP AGALGVAGIK KYVEQRGVTG
QTLVAIDSGA NVNFDRLRHV AERAELGEGR EAIIAVTIPE QPGSFKAFCE AIGKRQITEF
NYRYHTDREA HIFVGVQTHP ENDPRSALVA SLTGQGFPVL DLTDNELAKL HIRHMVGGHA
ERVNDEVVLR FEFPERPGAL FNFLNRLGGR WTISMFHYRN HGAADGRVVA GLVVPEEERH
LVGAALDEIG YRYWDESENP AYRLFLG
//
