ID Q1ZKZ3_PHOAS Unreviewed; 517 AA.
AC Q1ZKZ3;
DT 02-MAY-2006, integrated into UniProtKB/TrEMBL.
DT 02-MAY-2006, sequence version 1.
DT 24-JAN-2024, entry version 82.
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=VAS14_22542 {ECO:0000313|EMBL:EAS62871.1};
OS Photobacterium angustum (strain S14 / CCUG 15956) (Vibrio sp. (strain S14 /
OS CCUG 15956)).
OC Bacteria; Pseudomonadota; Gammaproteobacteria; Vibrionales; Vibrionaceae;
OC Photobacterium.
OX NCBI_TaxID=314292 {ECO:0000313|EMBL:EAS62871.1, ECO:0000313|Proteomes:UP000001603};
RN [1] {ECO:0000313|EMBL:EAS62871.1, ECO:0000313|Proteomes:UP000001603}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=S14 {ECO:0000313|EMBL:EAS62871.1,
RC ECO:0000313|Proteomes:UP000001603};
RX PubMed=19805210; DOI=10.1073/pnas.0903507106;
RA Lauro F.M., McDougald D., Thomas T., Williams T.J., Egan S., Rice S.,
RA DeMaere M.Z., Ting L., Ertan H., Johnson J., Ferriera S., Lapidus A.,
RA Anderson I., Kyrpides N., Munk A.C., Detter C., Han C.S., Brown M.V.,
RA Robb F.T., Kjelleberg S., Cavicchioli R.;
RT "The genomic basis of trophic strategy in marine bacteria.";
RL Proc. Natl. Acad. Sci. U.S.A. 106:15527-15533(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}.
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:EAS62871.1}.
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DR EMBL; AAOJ01000013; EAS62871.1; -; Genomic_DNA.
DR RefSeq; WP_005372343.1; NZ_CH902603.1.
DR AlphaFoldDB; Q1ZKZ3; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_6_0_6; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000001603; 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; 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:EAS62871.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012}; Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 341..413
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 436..507
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 517 AA; 56778 MW; C13AC4251D226041 CRC64;
MSEVKQATDE ELLSGADYLR NILRAPVYEV AQVTPLQNMS RLSARIANQI QLKREDRQPV
HSFKLRGAYN MMSQLTEPQK AAGVIAASAG NHAQGLALSS QKLGVKATIV MPRTTPDIKV
DAVRSFGGVV VLHGSNFDEA KGYAEQLAQQ HGYTFIPPFD HPSVIAGQGT IGIELVQQNG
HLDCVFVPVG GGGLAAGVAV LLKQLLPEIK VVGVEAEDSA CLKAALDAGK PVSLDQVGMF
ADGVAVKQIG SETFRLCQQY LDDVVTVSSD EICSAVKDIF EDTRAIAEPS GALSLAGLKK
YVEQHQIRDQ QLAAILSGAN LNFHGLRYVS ERCELGEKRE GLLAVTIPER PGAFLDFCHL
IGGRAVTEFN YRYNDDALAN VFVGVRLMQG QEELDGIIKD LRKGGYPVVD LSDDEMAKVH
VRYMIGGRPS KPLKERLYSF EFPEYPGALI RFLNTLGCHW NISLFNYRNH GADYGRVLCG
FELEDKDLLS FTSHLRELGY QWKDETENPA YKFFLAQ
//
