ID A0A2N7QVQ5_9GAMM Unreviewed; 520 AA.
AC A0A2N7QVQ5;
DT 25-APR-2018, integrated into UniProtKB/TrEMBL.
DT 25-APR-2018, sequence version 1.
DT 24-JAN-2024, entry version 37.
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 ECO:0000313|EMBL:PMQ05726.1};
GN ORFNames=DyAD56_08015 {ECO:0000313|EMBL:PMQ05726.1};
OS Dyella sp. AD56.
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Xanthomonadales;
OC Rhodanobacteraceae; Dyella.
OX NCBI_TaxID=1528744 {ECO:0000313|EMBL:PMQ05726.1, ECO:0000313|Proteomes:UP000235676};
RN [1] {ECO:0000313|EMBL:PMQ05726.1, ECO:0000313|Proteomes:UP000235676}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=AD56 {ECO:0000313|EMBL:PMQ05726.1,
RC ECO:0000313|Proteomes:UP000235676};
RA Schulz-Bohm K., Janssens T.K., De Jager V., Gawehns F., De Boer W.,
RA Garbeva P.;
RT "Bacterial performance in fungal presence.";
RL Submitted (AUG-2017) 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|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:PMQ05726.1}.
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DR EMBL; NRDP01000009; PMQ05726.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A2N7QVQ5; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000235676; 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; 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; 1.
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};
KW Lyase {ECO:0000256|RuleBase:RU362012, ECO:0000313|EMBL:PMQ05726.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000235676};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 346..417
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 440..511
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 520 AA; 56748 MW; 6DDEDA60E9E007C4 CRC64;
MNALVAAADA TDSLSEHELL RQTVGARVYD VARETSLDAA PLLSTRLGQH VLLKREDQQP
VFSFKLRGAY NRMAQLGPEQ RARGVIAASA GNHAQGVALA AARLGIHAVI VMPVTAPQVK
VDAVRRFGGP RVEVVLAGDS YSDAQAAASR LQAERGYTFV HPFDDAAVIA GQATVGMEIL
RQHPGALHAI FVPVGGGGLL AGVAGYVKAL RPEIKVIGVQ TCDSDAMVQS LQAGVPVTLP
EVGLFADGTA VKRVGDLTFE LCQRYVDDMV RVDTDAICAA IRDVFHDTRS VPEPAGALAL
AGLKQYVATH GASEHPMVAI VSGANLNFDR LRFVAERAEV GEQREAVFAV TIPEERGSFR
RFCAALDQRS ITEFNYRIGN ASEAHIFVGV QTTHRDERET LIDAFRSHGF GVLDLTDDEL
AKLHLRHMIG GSSPLARDEL LYRFEFPERP GALTRFLSHM HPDWNISLFH YRNQGADYGR
ILVGIQVPQD ERTLFQAFLD TLGYPFRDES ENPAYRLLLR
//
