ID A0A0Q7LI66_9BURK Unreviewed; 525 AA.
AC A0A0Q7LI66;
DT 20-JAN-2016, integrated into UniProtKB/TrEMBL.
DT 20-JAN-2016, sequence version 1.
DT 24-JAN-2024, entry version 39.
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=ASD34_23320 {ECO:0000313|EMBL:KQX95027.1};
OS Variovorax sp. Root473.
OC Bacteria; Pseudomonadota; Betaproteobacteria; Burkholderiales;
OC Comamonadaceae; Variovorax.
OX NCBI_TaxID=1736541 {ECO:0000313|EMBL:KQX95027.1, ECO:0000313|Proteomes:UP000051275};
RN [1] {ECO:0000313|Proteomes:UP000051275}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Root473 {ECO:0000313|Proteomes:UP000051275};
RA Garrido-Oter R., Bai Y.;
RL Submitted (OCT-2015) to the EMBL/GenBank/DDBJ databases.
RN [2] {ECO:0000313|EMBL:KQX95027.1, ECO:0000313|Proteomes:UP000051275}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Root473 {ECO:0000313|EMBL:KQX95027.1,
RC ECO:0000313|Proteomes:UP000051275};
RA Schulze-Lefert P.;
RT "Functional overlap of the Arabidopsis leaf and root microbiotas.";
RL Submitted (NOV-2015) 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:KQX95027.1}.
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DR EMBL; LMEV01000002; KQX95027.1; -; Genomic_DNA.
DR AlphaFoldDB; A0A0Q7LI66; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000051275; 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; 2.
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:KQX95027.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000051275};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 444..515
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 525 AA; 57171 MW; EF4C2DCF58AF0563 CRC64;
MDKILRNAPV TAALTPADYL RKILNARVYD VAVESALEKA RALSERLGNT VLLKREDQQP
VFSFKLRGAY NKMAHLSKAQ LASGVICASA GNHAQGVALG ARKLGTRAVI VMPVTTPQLK
IDAVRGFGGE IVLHGDSYSD AYLHALELQA QQSLTFVHPF DDPDVIAGQG TIAMEILRQH
QGPLDAVFVA IGGGGLISGV ANYIKAVRPE IKVIGVQMND SDAMMQSVAA HQRVNLPDVG
LFSDGTAVKL VGEETFRIAQ NLVDSYITVD TDAVCAAIKD VFVDTRSIVE PAGALAVAAI
KQYAAEHGRQ GETYAAILCG ANMNFDRLRF VAERAEVGEE REALFAVTIP EERGSFRRFC
ELISELPASG APRNVTEFNY RISDAAKAHV FVGLTTSARG ESATIAKVFI EHGFDALDLT
HDELAKEHLR HLVGGRTGLA HDERLLRFVF PERPGALLKF LSLMRPNWNI SLFHYRNQGA
DYGRILVGLQ VPAEESAAFD DFLETLGYPY VEETANPAYR LFLQA
//
