ID K0DF93_LEUCJ Unreviewed; 421 AA.
AC K0DF93;
DT 28-NOV-2012, integrated into UniProtKB/TrEMBL.
DT 28-NOV-2012, sequence version 1.
DT 27-MAR-2024, entry version 62.
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 OrderedLocusNames=C270_07115 {ECO:0000313|EMBL:AFT82332.1};
OS Leuconostoc carnosum (strain JB16).
OC Bacteria; Bacillota; Bacilli; Lactobacillales; Lactobacillaceae;
OC Leuconostoc.
OX NCBI_TaxID=1229758 {ECO:0000313|EMBL:AFT82332.1, ECO:0000313|Proteomes:UP000006299};
RN [1] {ECO:0000313|EMBL:AFT82332.1, ECO:0000313|Proteomes:UP000006299}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=JB16 {ECO:0000313|EMBL:AFT82332.1,
RC ECO:0000313|Proteomes:UP000006299};
RX PubMed=23144413; DOI=10.1128/JB.01805-12;
RA Jung J.Y., Lee S.H., Jeon C.O.;
RT "Complete genome sequence of Leuconostoc carnosum strain JB16, isolated
RT from Kimchi.";
RL J. Bacteriol. 194:6672-6673(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|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}.
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DR EMBL; CP003851; AFT82332.1; -; Genomic_DNA.
DR RefSeq; WP_014974942.1; NC_018673.1.
DR AlphaFoldDB; K0DF93; -.
DR STRING; 1229758.C270_07115; -.
DR GeneID; 61187221; -.
DR KEGG; lcn:C270_07115; -.
DR PATRIC; fig|1229758.3.peg.1428; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_4_2_9; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000006299; Chromosome.
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; cd01562; Thr-dehyd; 1.
DR Gene3D; 3.40.50.1100; -; 2.
DR InterPro; IPR011820; IlvA.
DR InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR InterPro; IPR001721; TD_ACT-like.
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; 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:AFT82332.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000006299}.
FT DOMAIN 338..412
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 421 AA; 46339 MW; 6477DA51BBEF95D6 CRC64;
MTYSDFLTAK DVIEAYQTLS KVVRHTALEY DEYLSKKYHA HIYLKREDQQ RVRSFKIRGA
YYNIIKADKE KLKNGVVAAS AGNHAQGVAA TCRALDIQAT IFMPVTTPNQ KVSAVRRFGG
KNITTILVGD TFDEAQQAAL DYTQKNQMFL VAPFDDYATM AGQGSIAVEI FNDAKDQAID
VDYLITSVGG GGLISGVSTY TKYISPQTTV VGVEPETAQS MAAAFKAQQP VTVSNVDHFV
DGAAVAKVGQ LTYRQAHRYV DRLLAVPEGK VAQTVMDMYT YEAIVAEPAG AMPIASLDII
AKDIVDQTVV LVVSGGNNDI SRMQEMEQKS LMYKGQQQFY LVEFPQRPGA LRQFVNDVLG
PNDDITRFEY TKKINSETGS VMVGILLGEG TSVTSLTQRL SAFFPKYVNL QENSVLFNML
V
//
