ID A4G8Y8_HERAR Unreviewed; 507 AA.
AC A4G8Y8;
DT 17-APR-2007, integrated into UniProtKB/TrEMBL.
DT 17-APR-2007, sequence version 1.
DT 27-MAR-2024, entry version 98.
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:CAL62975.1};
GN OrderedLocusNames=HEAR2861 {ECO:0000313|EMBL:CAL62975.1};
OS Herminiimonas arsenicoxydans.
OC Bacteria; Pseudomonadota; Betaproteobacteria; Burkholderiales;
OC Oxalobacteraceae; Herminiimonas.
OX NCBI_TaxID=204773 {ECO:0000313|EMBL:CAL62975.1, ECO:0000313|Proteomes:UP000006697};
RN [1] {ECO:0000313|EMBL:CAL62975.1, ECO:0000313|Proteomes:UP000006697}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ULPAs1 {ECO:0000313|Proteomes:UP000006697};
RX PubMed=17432936; DOI=10.1371/journal.pgen.0030053;
RA Muller D., Medigue C., Koechler S., Barbe V., Barakat M., Talla E.,
RA Bonnefoy V., Krin E., Arsene-Ploetze F., Carapito C., Chandler M.,
RA Cournoyer B., Cruveiller S., Dossat C., Duval S., Heymann M., Leize E.,
RA Lieutaud A., Lievremont D., Makita Y., Mangenot S., Nitschke W., Ortet P.,
RA Perdrial N., Schoepp B., Siguier N., Simeonova D.D., Rouy Z., Segurens B.,
RA Turlin E., Vallenet D., Van Dorsselaer A., Weiss S., Weissenbach J.,
RA Lett M.C., Danchin A., Bertin P.N.;
RT "A tale of two oxidation states: bacterial colonization of arsenic-rich
RT environments.";
RL PLoS Genet. 3:518-530(2007).
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; CU207211; CAL62975.1; -; Genomic_DNA.
DR AlphaFoldDB; A4G8Y8; -.
DR STRING; 204773.HEAR2861; -.
DR KEGG; har:HEAR2861; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_6_2_4; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000006697; 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:CAL62975.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000006697};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 334..405
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 428..499
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 507 AA; 55930 MW; 216F929B2EA365C4 CRC64;
MTTDYLKKIL TARVYDVAVE SPLELAPTLS QRFGNQIYFK REDIQSVFSF KLRGAYNKMA
HLPPAQMKRG VICASAGNHA QGVALSAARL GCRAVIVMPT TTPSVKIEAV KARGGEVVLF
GDSYSDAYQH ALTLEKKLKL TFVHPFDDPD VIAGQGTIGM EILRQHSGPI HAIFVPIGGG
GLIAGIGAYV KAVRPDIKII GVQTVDSDAM ARSLQSNRRV TMTDVGLFAD GTAVKLVGEE
TFRLAKLYVD DIILVSTDEV CSAIKDVFQD TRSILEPSGA LSVAGAKAYI ERAHADKKPI
KNETLITIAS GANMNFDRLR FVAEMADVGA AREGVFAVTI PEERGSFKRF CELVGPRNVT
EFNYRLSDAK QAHIFVGLQI ADRDEAGKIA RRFEKHGFKT LDLTHDELAK GHIRHLVGGK
SDLTHDELLY RFEFPERPGA LMRFLDSVAP HWNISLFHYR NEGGDVSRIL VGIQVPKKEM
KTFRASLAGL GYRHWDETDN PVYKLFL
//
