ID H0PWV7_9RHOO Unreviewed; 506 AA.
AC H0PWV7;
DT 22-FEB-2012, integrated into UniProtKB/TrEMBL.
DT 22-FEB-2012, sequence version 1.
DT 24-JAN-2024, entry version 55.
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:BAL26606.1};
GN ORFNames=AZKH_4329 {ECO:0000313|EMBL:BAL26606.1};
OS Azoarcus sp. KH32C.
OC Bacteria; Pseudomonadota; Betaproteobacteria; Rhodocyclales; Zoogloeaceae;
OC Azoarcus.
OX NCBI_TaxID=748247 {ECO:0000313|EMBL:BAL26606.1, ECO:0000313|Proteomes:UP000007106};
RN [1] {ECO:0000313|EMBL:BAL26606.1, ECO:0000313|Proteomes:UP000007106}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=KH32C {ECO:0000313|EMBL:BAL26606.1,
RC ECO:0000313|Proteomes:UP000007106};
RA Nishizawa T., Tago T., Oshima K., Hattori M., Ishii S., Otsuka S.,
RA Senoo K.;
RT "Complete genome sequence of Azoarcus sp. KH32C.";
RL Submitted (NOV-2011) to the EMBL/GenBank/DDBJ databases.
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; AP012304; BAL26606.1; -; Genomic_DNA.
DR RefSeq; WP_015437906.1; NC_020516.1.
DR AlphaFoldDB; H0PWV7; -.
DR STRING; 748247.AZKH_4329; -.
DR KEGG; aza:AZKH_4329; -.
DR PATRIC; fig|748247.4.peg.4287; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_6_3_4; -.
DR OrthoDB; 9811476at2; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000007106; 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}; Lyase {ECO:0000256|RuleBase:RU362012};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000007106};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 332..403
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 426..497
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 506 AA; 56013 MW; BF4368E7DB626185 CRC64;
MTAEHPDYLE KILNARVYDV AEETPLDLAS NLSARIHNRI FLKREDMQPV FSFKLRGAYN
KMAHLSPQAL KRGVICASAG NHAQGVALSA QKLGVRAVIV MPTSTPQIKV DAVKARGGEV
VLAGDSYSDA YAHAVELEKT EKLTFVHPYD DPDVIAGQGT IGMEILRAHP DPIHAVFCAV
GGGGLISGVA AYIKRLRPET KIIGVETVDA DAMTRSLAEG RRVALDQVGL FADGTAVKLV
GEETFRLCQQ YVDEMILVDN DAICAALKDV FEDTRSILEP SGALAVAGAK EYAKLHNLHG
KNLVAVASGA NMNFDRLRFV AERAEVGEQR EAVFAVTIPE RPGSFRKFCS LIGNRHITEF
NYRYADPRQA HIFVGVSVHN RAEATRIIEM LDRHELPAVD LTDDEMAKSH IRYMVGGRAP
HVNHELVYRF EFPERPGALM NFLSNLHSDW NISLFHYRNH GADFGRVLVG MQVPPEDKTA
FQDFLDRLGY EYVDESANPA YRMFLG
//
