ID A5FWZ6_ACICJ Unreviewed; 398 AA.
AC A5FWZ6;
DT 12-JUN-2007, integrated into UniProtKB/TrEMBL.
DT 12-JUN-2007, sequence version 1.
DT 27-MAR-2024, entry version 85.
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 OrderedLocusNames=Acry_0909 {ECO:0000313|EMBL:ABQ30128.1};
OS Acidiphilium cryptum (strain JF-5).
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Rhodospirillales;
OC Acetobacteraceae; Acidiphilium.
OX NCBI_TaxID=349163 {ECO:0000313|EMBL:ABQ30128.1, ECO:0000313|Proteomes:UP000000245};
RN [1] {ECO:0000313|EMBL:ABQ30128.1, ECO:0000313|Proteomes:UP000000245}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=JF-5 {ECO:0000313|EMBL:ABQ30128.1,
RC ECO:0000313|Proteomes:UP000000245};
RG US DOE Joint Genome Institute;
RA Copeland A., Lucas S., Lapidus A., Barry K., Detter J.C.,
RA Glavina del Rio T., Hammon N., Israni S., Dalin E., Tice H., Pitluck S.,
RA Sims D., Brettin T., Bruce D., Han C., Schmutz J., Larimer F., Land M.,
RA Hauser L., Kyrpides N., Kim E., Magnuson T., Richardson P.;
RT "Complete sequence of chromosome of Acidiphilium cryptum JF-5.";
RL Submitted (MAY-2007) 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|RuleBase:RU363083}.
CC -!- FUNCTION: TdcB also dehydrates serine to yield pyruvate via analogous
CC enamine/imine intermediates. {ECO:0000256|RuleBase:RU363083}.
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; CP000697; ABQ30128.1; -; Genomic_DNA.
DR RefSeq; WP_011941865.1; NC_009484.1.
DR AlphaFoldDB; A5FWZ6; -.
DR STRING; 349163.Acry_0909; -.
DR KEGG; acr:Acry_0909; -.
DR eggNOG; COG1171; Bacteria.
DR eggNOG; COG2061; Bacteria.
DR HOGENOM; CLU_021152_4_1_5; -.
DR UniPathway; UPA00052; UER00507.
DR Proteomes; UP000000245; 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:0009097; P:isoleucine biosynthetic process; IEA:UniProtKB-KW.
DR GO; GO:0070689; P:L-threonine catabolic process to propionate; IEA:UniProtKB-UniPathway.
DR CDD; cd04886; ACT_ThrD-II-like; 1.
DR CDD; cd01562; Thr-dehyd; 1.
DR Gene3D; 3.40.50.1100; -; 2.
DR InterPro; IPR045865; ACT-like_dom_sf.
DR InterPro; IPR002912; ACT_dom.
DR InterPro; IPR044561; ACT_ThrD-II-like.
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; PF01842; ACT; 1.
DR Pfam; PF00291; PALP; 1.
DR SUPFAM; SSF55021; ACT-like; 1.
DR SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1.
DR PROSITE; PS51671; ACT; 1.
PE 3: Inferred from homology;
KW Amino-acid biosynthesis {ECO:0000256|ARBA:ARBA00023304};
KW Branched-chain amino acid biosynthesis {ECO:0000256|ARBA:ARBA00023304};
KW Isoleucine biosynthesis {ECO:0000256|ARBA:ARBA00022624};
KW Lyase {ECO:0000256|RuleBase:RU363083, ECO:0000313|EMBL:ABQ30128.1};
KW Nucleotide-binding {ECO:0000256|RuleBase:RU363083};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU363083};
KW Reference proteome {ECO:0000313|Proteomes:UP000000245}.
FT DOMAIN 325..398
FT /note="ACT"
FT /evidence="ECO:0000259|PROSITE:PS51671"
SQ SEQUENCE 398 AA; 41647 MW; B8B83A6E23037509 CRC64;
MVTLADIEAA AGRIAGAVLR TPLVRADALS RATGADIHLK LENLQATGAF KERGAANRIA
LLTEAERKSG VIAMSAGNHA QAVARHAQLA GIRATIVMPR FTPTTKVTRT RAWGAQVVLH
GETLAEAAAH AHELAAREGL VFVHPYDDAD VIAGQGTLAL EVIHDLPDLD ALVIPTGGGG
FISGCAVAAR ALRPRVEILG VEVESYAGFA QALAGQEVKV GGATIAEGIA VRDIGQLPLA
LLKEHEVEVL VVPEAAVEQA IAMLAESGKI VAEGAGAAAL AAVLTFPQRF AGRRLALPIC
GGNIDTRVLA NTLLRNLMRD GRIVKVLMEI PDRPGVLADI AARIGDQGGN IIEVVHQRQF
ASPTVQAAHL EVMFEARDAA HGRSITEALE AAYTVRRL
//
