ID C5BMC7_TERTT Unreviewed; 504 AA.
AC C5BMC7;
DT 28-JUL-2009, integrated into UniProtKB/TrEMBL.
DT 28-JUL-2009, sequence version 1.
DT 27-MAR-2024, entry version 83.
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:ACR10835.1};
GN OrderedLocusNames=TERTU_0391 {ECO:0000313|EMBL:ACR10835.1};
OS Teredinibacter turnerae (strain ATCC 39867 / T7901).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Cellvibrionales;
OC Cellvibrionaceae; Teredinibacter.
OX NCBI_TaxID=377629 {ECO:0000313|EMBL:ACR10835.1, ECO:0000313|Proteomes:UP000009080};
RN [1] {ECO:0000313|EMBL:ACR10835.1, ECO:0000313|Proteomes:UP000009080}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 39867 / T7901 {ECO:0000313|Proteomes:UP000009080};
RX PubMed=19568419; DOI=10.1371/journal.pone.0006085;
RA Yang J.C., Madupu R., Durkin A.S., Ekborg N.A., Pedamallu C.S.,
RA Hostetler J.B., Radune D., Toms B.S., Henrissat B., Coutinho P.M.,
RA Schwarz S., Field L., Trindade-Silva A.E., Soares C.A.G., Elshahawi S.,
RA Hanora A., Schmidt E.W., Haygood M.G., Posfai J., Benner J., Madinger C.,
RA Nove J., Anton B., Chaudhary K., Foster J., Holman A., Kumar S.,
RA Lessard P.A., Luyten Y.A., Slatko B., Wood N., Wu B., Teplitski M.,
RA Mougous J.D., Ward N., Eisen J.A., Badger J.H., Distel D.L.;
RT "The complete genome of Teredinibacter turnerae T7901: an intracellular
RT endosymbiont of marine wood-boring bivalves (shipworms).";
RL PLoS ONE 4:E6085-E6085(2009).
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}.
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DR EMBL; CP001614; ACR10835.1; -; Genomic_DNA.
DR RefSeq; WP_015816947.1; NC_012997.1.
DR AlphaFoldDB; C5BMC7; -.
DR STRING; 377629.TERTU_0391; -.
DR KEGG; ttu:TERTU_0391; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_6_0_6; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000009080; 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; 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:ACR10835.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000009080};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 329..401
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 424..495
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 504 AA; 55884 MW; 8F0253B7C4542FB1 CRC64;
MPQSYLKRIL DARIYDLAVE TPLDMMPNIS LRTGNTILLK REDLQPVFSF KIRGAYNKLL
QLSDEQRKGG VVAASAGNHA QGLALAAKHM GISATIVMPQ TTPYIKVNGV KRHGAKVVQI
GDTYDEASAY AKTLVAEKGM TYIPPYDDPD VIAGQGTVAL ELLRQWTGNI DAVFIPVGGG
GLCAGMASYI KYVRPDIKVF AVEADESACL KAAMDAQRRV KLPQVGIFAD GVAVAQIGKE
TFRVIRECID GVITVSTDEI CSAIKDIFED TRSIAEPAGA LSLAGLKKYI EQNQCSEHTL
VAVDSGANTN FDRLRYISER TEIGEKREAI LAVTIPEKPG SYRGFCRLLG KRLITEFNYR
FADSTDAHIF VGLQVSGEQS DHDELIENLR SKDYKVVDMT DNEVAKLHIR YMVGGHAPQV
EDEIVYRFEF PERPGALLNF LNKLAGRWNI SLFHYRNHGS ASGRVLVGMQ VPKTERKQLR
ELLDDLGYPY SDETENEAYK YFLS
//
