ID A0A099GBQ3_9RHOB Unreviewed; 415 AA.
AC A0A099GBQ3;
DT 07-JAN-2015, integrated into UniProtKB/TrEMBL.
DT 07-JAN-2015, sequence version 1.
DT 24-JAN-2024, entry version 44.
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 ORFNames=IX56_14960 {ECO:0000313|EMBL:KGJ19992.1};
OS Paracoccus sanguinis.
OC Bacteria; Pseudomonadota; Alphaproteobacteria; Rhodobacterales;
OC Paracoccaceae; Paracoccus.
OX NCBI_TaxID=1545044 {ECO:0000313|EMBL:KGJ19992.1, ECO:0000313|Proteomes:UP000029858};
RN [1] {ECO:0000313|EMBL:KGJ19992.1, ECO:0000313|Proteomes:UP000029858}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=5503 {ECO:0000313|EMBL:KGJ19992.1,
RC ECO:0000313|Proteomes:UP000029858};
RA McGinnis J.M., Wolfgang W.J.;
RL Submitted (SEP-2014) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:KGJ19992.1, ECO:0000313|Proteomes:UP000029858}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=5503 {ECO:0000313|EMBL:KGJ19992.1,
RC ECO:0000313|Proteomes:UP000029858};
RA Mingle L.A., Cole J.A., Lapierre P., Musser K.A.;
RT "Paracoccus sanguinis sp. nov., isolated from clinical specimens of New
RT York State patients.";
RL Submitted (OCT-2014) 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|ARBA:ARBA00011881,
CC ECO:0000256|RuleBase:RU362012}.
CC -!- SIMILARITY: Belongs to the serine/threonine dehydratase family.
CC {ECO:0000256|ARBA:ARBA00010869, ECO:0000256|RuleBase:RU362012}.
CC -!- CAUTION: The sequence shown here is derived from an EMBL/GenBank/DDBJ
CC whole genome shotgun (WGS) entry which is preliminary data.
CC {ECO:0000313|EMBL:KGJ19992.1}.
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DR EMBL; JRKQ01000108; KGJ19992.1; -; Genomic_DNA.
DR RefSeq; WP_036711809.1; NZ_JRKQ01000108.1.
DR AlphaFoldDB; A0A099GBQ3; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000029858; Unassembled WGS sequence.
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; cd04907; ACT_ThrD-I_2; 1.
DR Gene3D; 3.40.50.1100; -; 2.
DR InterPro; IPR045865; ACT-like_dom_sf.
DR InterPro; IPR011820; IlvA.
DR InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR InterPro; IPR001721; TD_ACT-like.
DR InterPro; IPR038110; TD_ACT-like_sf.
DR InterPro; IPR001926; TrpB-like_PALP.
DR InterPro; IPR036052; TrpB-like_PALP_sf.
DR NCBIfam; TIGR02079; THD1; 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; 1.
DR SUPFAM; SSF55021; ACT-like; 1.
DR SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1.
DR PROSITE; PS51672; ACT_LIKE; 1.
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:KGJ19992.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000029858}.
FT DOMAIN 333..406
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 415 AA; 44203 MW; 6E7353CD6B9C7F9B CRC64;
MSDFLAAVAD AEAALRTLFD PTPLQRNDHL SARYDADIWL KREDLTPVRS YKLRGAFNAM
RHAGAGPGAR FVCASAGNHA QGVAFACRHF GAQGVIFMPV TTPRQKIDKT RMFGAGAVEI
VLTGDYFDQT LKAAQDYTAA HGAVFLSPFD DARVIEGQAT VAAEMLAQID AAPDLVVLPV
GGGGLAAGVT EYCALSAPQT GFAFVEPAGG ASLAAALAEG APVTLPRVDS FVDGAAVARI
GALPFARLGR FAVSDTLQAP EDRISATMLE MLNGEGIVLE PAGALAIDAL RDLAAQGRLA
GRRVVCICSG GNFDFERLPE VRERAQRWAG LKKYFILRLP QRPGALREFL NLLGPEDDIA
RFEYLKKSAR NFGSVLIGIE TTDPANLDAL NARLAEAGFD WRDITGDPVL AEFLI
//
