ID B5REK0_SALG2 Unreviewed; 329 AA.
AC B5REK0;
DT 04-NOV-2008, integrated into UniProtKB/TrEMBL.
DT 04-NOV-2008, sequence version 1.
DT 27-MAR-2024, entry version 79.
DE RecName: Full=L-threonine dehydratase catabolic TdcB {ECO:0000256|RuleBase:RU363083};
DE EC=4.3.1.17 {ECO:0000256|RuleBase:RU363083};
DE EC=4.3.1.19 {ECO:0000256|RuleBase:RU363083};
DE AltName: Full=L-serine dehydratase {ECO:0000256|RuleBase:RU363083};
DE AltName: Full=Threonine deaminase {ECO:0000256|RuleBase:RU363083};
GN Name=tdcB {ECO:0000313|EMBL:CAR38940.1};
GN OrderedLocusNames=SG3141 {ECO:0000313|EMBL:CAR38940.1};
OS Salmonella gallinarum (strain 287/91 / NCTC 13346).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Enterobacterales;
OC Enterobacteriaceae; Salmonella.
OX NCBI_TaxID=550538 {ECO:0000313|EMBL:CAR38940.1, ECO:0000313|Proteomes:UP000008321};
RN [1] {ECO:0000313|EMBL:CAR38940.1, ECO:0000313|Proteomes:UP000008321}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=287/91 / NCTC 13346 {ECO:0000313|Proteomes:UP000008321};
RX PubMed=18583645; DOI=10.1101/gr.077404.108;
RA Thomson N.R., Clayton D.J., Windhorst D., Vernikos G., Davidson S.,
RA Churcher C., Quail M.A., Stevens M., Jones M.A., Watson M., Barron A.,
RA Layton A., Pickard D., Kingsley R.A., Bignell A., Clark L., Harris B.,
RA Ormond D., Abdellah Z., Brooks K., Cherevach I., Chillingworth T.,
RA Woodward J., Norberczak H., Lord A., Arrowsmith C., Jagels K., Moule S.,
RA Mungall K., Sanders M., Whitehead S., Chabalgoity J.A., Maskell D.,
RA Humphrey T., Roberts M., Barrow P.A., Dougan G., Parkhill J.;
RT "Comparative genome analysis of Salmonella enteritidis PT4 and Salmonella
RT gallinarum 287/91 provides insights into evolutionary and host adaptation
RT pathways.";
RL Genome Res. 18:1624-1637(2008).
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. TdcB also dehydrates
CC serine to yield pyruvate via analogous enamine/imine intermediates.
CC {ECO:0000256|ARBA:ARBA00025594}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=L-serine = NH4(+) + pyruvate; Xref=Rhea:RHEA:19169,
CC ChEBI:CHEBI:15361, ChEBI:CHEBI:28938, ChEBI:CHEBI:33384; EC=4.3.1.17;
CC Evidence={ECO:0000256|RuleBase:RU363083};
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|RuleBase:RU363083};
CC -!- COFACTOR:
CC Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC Evidence={ECO:0000256|ARBA:ARBA00001933,
CC ECO:0000256|RuleBase:RU363083};
CC -!- PATHWAY: Amino-acid degradation; L-threonine degradation via propanoate
CC pathway; propanoate from L-threonine: step 1/4.
CC {ECO:0000256|RuleBase:RU363083}.
CC -!- SUBUNIT: In the native structure, TdcB is in a dimeric form, whereas in
CC the TdcB-AMP complex, it exists in a tetrameric form (dimer of dimers).
CC {ECO:0000256|RuleBase:RU363083}.
CC -!- SIMILARITY: Belongs to the serine/threonine dehydratase family.
CC {ECO:0000256|RuleBase:RU363083}.
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DR EMBL; AM933173; CAR38940.1; -; Genomic_DNA.
DR RefSeq; WP_000548371.1; NC_011274.1.
DR AlphaFoldDB; B5REK0; -.
DR KEGG; seg:SG3141; -.
DR HOGENOM; CLU_021152_4_1_6; -.
DR UniPathway; UPA00052; UER00507.
DR Proteomes; UP000008321; Chromosome.
DR GO; GO:0003941; F:L-serine ammonia-lyase activity; IEA:UniProtKB-EC.
DR GO; GO:0004794; F:L-threonine ammonia-lyase activity; IEA:UniProtKB-EC.
DR GO; GO:0000166; F:nucleotide binding; IEA:UniProtKB-KW.
DR GO; GO:0030170; F:pyridoxal phosphate binding; IEA:InterPro.
DR GO; GO:0070689; P:L-threonine catabolic process to propionate; IEA:UniProtKB-UniPathway.
DR CDD; cd01562; Thr-dehyd; 1.
DR Gene3D; 3.40.50.1100; -; 2.
DR InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR InterPro; IPR005789; Thr_deHydtase_catblc.
DR InterPro; IPR001926; TrpB-like_PALP.
DR InterPro; IPR036052; TrpB-like_PALP_sf.
DR NCBIfam; TIGR01127; ilvA_1Cterm; 1.
DR PANTHER; PTHR48078:SF6; ACT DOMAIN-CONTAINING PROTEIN; 1.
DR PANTHER; PTHR48078; THREONINE DEHYDRATASE, MITOCHONDRIAL-RELATED; 1.
DR Pfam; PF00291; PALP; 1.
DR SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1.
DR PROSITE; PS00165; DEHYDRATASE_SER_THR; 1.
PE 3: Inferred from homology;
KW Lyase {ECO:0000256|RuleBase:RU363083};
KW Nucleotide-binding {ECO:0000256|RuleBase:RU363083};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU363083}.
FT DOMAIN 25..312
FT /note="Tryptophan synthase beta chain-like PALP"
FT /evidence="ECO:0000259|Pfam:PF00291"
SQ SEQUENCE 329 AA; 35139 MW; 3557DEA7EBAA133F CRC64;
MHITYDLPVA IEDILEAKKR LAGKIYKTGM PRSNYFSERC KGEIFLKFEN MQRTGSFKIR
GAFNKLSSLT EAEKRKGVVA CSAGNHAQGV SLSCAMLGID GKVVMPKGAP KSKVAATCDY
SAEVVLHGDN FNDTIAKVSE IVETEGRIFI PPYDDPKVIA GQGTIGLEIM EDLYDVDNVI
VPIGGGGLIA GIAIAIKSIN PTIKVIGVQA ENVHGMAVSY YAGEITTHRT TGTLADGCDV
SRPGNLTYEI VRELVDDIVL VSEDEIRNSM IALIQRNKVI TEGAGALACA ALLSGKLDSH
IQNRKTVSII SGGNIDLSRV SQITGLVDA
//
