TDCB_SHIFL
ID TDCB_SHIFL Reviewed; 329 AA.
AC P0AGF9; P05792;
DT 20-DEC-2005, integrated into UniProtKB/Swiss-Prot.
DT 20-DEC-2005, sequence version 1.
DT 03-AUG-2022, entry version 104.
DE RecName: Full=L-threonine dehydratase catabolic TdcB;
DE EC=4.3.1.19;
DE AltName: Full=L-serine dehydratase;
DE EC=4.3.1.17;
DE AltName: Full=Threonine deaminase;
GN Name=tdcB; OrderedLocusNames=SF3157, S3369;
OS Shigella flexneri.
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC Enterobacteriaceae; Shigella.
OX NCBI_TaxID=623;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=301 / Serotype 2a;
RX PubMed=12384590; DOI=10.1093/nar/gkf566;
RA Jin Q., Yuan Z., Xu J., Wang Y., Shen Y., Lu W., Wang J., Liu H., Yang J.,
RA Yang F., Zhang X., Zhang J., Yang G., Wu H., Qu D., Dong J., Sun L.,
RA Xue Y., Zhao A., Gao Y., Zhu J., Kan B., Ding K., Chen S., Cheng H.,
RA Yao Z., He B., Chen R., Ma D., Qiang B., Wen Y., Hou Y., Yu J.;
RT "Genome sequence of Shigella flexneri 2a: insights into pathogenicity
RT through comparison with genomes of Escherichia coli K12 and O157.";
RL Nucleic Acids Res. 30:4432-4441(2002).
RN [2]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 700930 / 2457T / Serotype 2a;
RX PubMed=12704152; DOI=10.1128/iai.71.5.2775-2786.2003;
RA Wei J., Goldberg M.B., Burland V., Venkatesan M.M., Deng W., Fournier G.,
RA Mayhew G.F., Plunkett G. III, Rose D.J., Darling A., Mau B., Perna N.T.,
RA Payne S.M., Runyen-Janecky L.J., Zhou S., Schwartz D.C., Blattner F.R.;
RT "Complete genome sequence and comparative genomics of Shigella flexneri
RT serotype 2a strain 2457T.";
RL Infect. Immun. 71:2775-2786(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. TdcB also dehydrates
CC serine to yield pyruvate via analogous enamine/imine intermediates (By
CC similarity). {ECO:0000250}.
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 -!- 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 -!- COFACTOR:
CC Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC Evidence={ECO:0000250};
CC -!- ACTIVITY REGULATION: Each protein molecule can bind up to four
CC molecules of AMP, which act as an allosteric activator to the enzyme.
CC {ECO:0000250}.
CC -!- PATHWAY: Amino-acid degradation; L-threonine degradation via propanoate
CC pathway; propanoate from L-threonine: step 1/4.
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:0000250}.
CC -!- SIMILARITY: Belongs to the serine/threonine dehydratase family.
CC {ECO:0000305}.
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DR EMBL; AE005674; AAN44628.1; -; Genomic_DNA.
DR EMBL; AE014073; AAP18442.1; -; Genomic_DNA.
DR RefSeq; NP_708921.1; NC_004337.2.
DR RefSeq; WP_000548347.1; NZ_WPGW01000077.1.
DR AlphaFoldDB; P0AGF9; -.
DR SMR; P0AGF9; -.
DR STRING; 198214.SF3157; -.
DR EnsemblBacteria; AAN44628; AAN44628; SF3157.
DR EnsemblBacteria; AAP18442; AAP18442; S3369.
DR GeneID; 1027202; -.
DR GeneID; 66672982; -.
DR KEGG; sfl:SF3157; -.
DR KEGG; sfx:S3369; -.
DR PATRIC; fig|198214.7.peg.3747; -.
DR HOGENOM; CLU_021152_4_2_6; -.
DR OMA; LIHPFDH; -.
DR OrthoDB; 1876944at2; -.
DR UniPathway; UPA00052; UER00507.
DR Proteomes; UP000001006; Chromosome.
DR Proteomes; UP000002673; 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 Gene3D; 3.40.50.1100; -; 2.
DR InterPro; IPR001926; PLP-dep.
DR InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR InterPro; IPR005789; Thr_deHydtase_catblc.
DR InterPro; IPR036052; Trypto_synt_PLP_dependent.
DR Pfam; PF00291; PALP; 1.
DR SUPFAM; SSF53686; SSF53686; 1.
DR TIGRFAMs; TIGR01127; ilvA_1Cterm; 1.
DR PROSITE; PS00165; DEHYDRATASE_SER_THR; 1.
PE 3: Inferred from homology;
KW Allosteric enzyme; Lyase; Nucleotide-binding; Pyridoxal phosphate;
KW Reference proteome.
FT CHAIN 1..329
FT /note="L-threonine dehydratase catabolic TdcB"
FT /id="PRO_0000185586"
FT BINDING 53..54
FT /ligand="AMP"
FT /ligand_id="ChEBI:CHEBI:456215"
FT /evidence="ECO:0000250"
FT BINDING 88
FT /ligand="AMP"
FT /ligand_id="ChEBI:CHEBI:456215"
FT /evidence="ECO:0000250"
FT BINDING 119..120
FT /ligand="AMP"
FT /ligand_id="ChEBI:CHEBI:456215"
FT /evidence="ECO:0000250"
FT BINDING 314
FT /ligand="AMP"
FT /ligand_id="ChEBI:CHEBI:456215"
FT /evidence="ECO:0000250"
FT MOD_RES 58
FT /note="N6-(pyridoxal phosphate)lysine"
FT /evidence="ECO:0000250"
SQ SEQUENCE 329 AA; 35232 MW; E7DF018FCCF743B1 CRC64;
MHITYDLPVA IDDIIEAKQR LAGRIYKTGM PRSNYFSERC KGEIFLKFEN MQRTGSFKIR
GAFNKLSSLT DAEKRKGVVA CSAGNHAQGV SLSCAMLGID GKVVMPKGAP KSKVAATCDY
SAEVVLHGDN FNDTIAKVSE IVEMEGRIFI PPYDDPKVIA GQGTIGLEIM EDLYDVDNVI
VPIGGGGLIA GIAVAIKSIN PTIRVIGVQS ENVHGMAASF HSGEITTHRT TGTLADGCDV
SRPGNLTYEI VRELVDDIVL VSEDEIRNSM IALIQRNKVV TEGAGALACA ALLSGKLDQY
IQNRKTVSII SGGNIDLSRV SQITGFVDA
