ID I4W9D0_9GAMM Unreviewed; 522 AA.
AC I4W9D0;
DT 19-FEB-2014, integrated into UniProtKB/TrEMBL.
DT 19-FEB-2014, 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=UU5_08353 {ECO:0000313|EMBL:EIL96071.1};
OS Rhodanobacter sp. 115.
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Xanthomonadales;
OC Rhodanobacteraceae; Rhodanobacter.
OX NCBI_TaxID=1162282 {ECO:0000313|EMBL:EIL96071.1, ECO:0000313|Proteomes:UP000004557};
RN [1] {ECO:0000313|EMBL:EIL96071.1, ECO:0000313|Proteomes:UP000004557}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=115 {ECO:0000313|EMBL:EIL96071.1,
RC ECO:0000313|Proteomes:UP000004557};
RX PubMed=22843592; DOI=10.1128/JB.00871-12;
RA Kostka J.E., Green S.J., Rishishwar L., Prakash O., Katz L.S.,
RA Marino-Ramirez L., Jordan I.K., Munk C., Ivanova N., Mikhailova N.,
RA Watson D.B., Brown S.D., Palumbo A.V., Brooks S.C.;
RT "Genome sequences for six rhodanobacter strains, isolated from soils and
RT the terrestrial subsurface, with variable denitrification capabilities.";
RL J. Bacteriol. 194:4461-4462(2012).
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:EIL96071.1}.
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DR EMBL; AJXS01000206; EIL96071.1; -; Genomic_DNA.
DR RefSeq; WP_008211732.1; NZ_AJXS01000206.1.
DR AlphaFoldDB; I4W9D0; -.
DR PATRIC; fig|1162282.3.peg.1601; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000004557; 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}; Lyase {ECO:0000256|RuleBase:RU362012};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012}; Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 347..418
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 441..512
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 522 AA; 56562 MW; E6B4B6D6F09DE3BD CRC64;
MNARLAEQAT ADAAATDREL LQRAQASRVY DVAHETALDD APLLSARLGA RVLLKREDQQ
PVFSFKLRGA YNRMVQLDAA QRACGVVAAS AGNHAQGVAL AAAKLGIRAV IVMPVTAPQV
KIDAVRRLGG DFVEVMLAGD SYSDAQEAAA RVQAERGSVF VHPFDDLDVI AGQATVGLEL
LRQCPDNLHA VFVPVGGGGL LSGIAACIKA QRPGVKVIGV QATDSDAMAR SLENGERALL
NEVGLFADGT AVKQVGALTF ALCQRHVDAM LRVDTDAICA AIRDVYQETR CVPEPSGALA
LAGLKQYAAA HGDIDGALAA VVSGANMNFD RLRFVAERAE VGEQREAVFA VTIPEERGSF
RRFCAALGQH SITEFNYRIG DATRAHLFVG IQTTGRNERE ALATAFRAQA FDVLDLTDDE
LAKLHLRHMI GGRSPLADDE RIYRFEFPER PGALTRFLGH MHPDWNISLF HYRNQGADYG
RILVGIQVPA DEQPAFRQFL DTLGYPHCDE SENPAYRLLL RE
//
