ID A2SKI9_METPP Unreviewed; 526 AA.
AC A2SKI9;
DT 06-MAR-2007, integrated into UniProtKB/TrEMBL.
DT 06-MAR-2007, sequence version 1.
DT 27-MAR-2024, entry version 104.
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=Mpe_A3125 {ECO:0000313|EMBL:ABM96078.1};
OS Methylibium petroleiphilum (strain ATCC BAA-1232 / LMG 22953 / PM1).
OC Bacteria; Pseudomonadota; Betaproteobacteria; Burkholderiales;
OC Sphaerotilaceae; Methylibium.
OX NCBI_TaxID=420662 {ECO:0000313|EMBL:ABM96078.1, ECO:0000313|Proteomes:UP000000366};
RN [1] {ECO:0000313|EMBL:ABM96078.1, ECO:0000313|Proteomes:UP000000366}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC BAA-1232 / LMG 22953 / PM1
RC {ECO:0000313|Proteomes:UP000000366};
RX PubMed=17158667; DOI=10.1128/JB.01259-06;
RA Kane S.R., Chakicherla A.Y., Chain P.S.G., Schmidt R., Shin M.W.,
RA Legler T.C., Scow K.M., Larimer F.W., Lucas S.M., Richardson P.M.,
RA Hristova K.R.;
RT "Whole-genome analysis of the methyl tert-butyl ether-degrading beta-
RT proteobacterium Methylibium petroleiphilum PM1.";
RL J. Bacteriol. 189:1931-1945(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; CP000555; ABM96078.1; -; Genomic_DNA.
DR RefSeq; WP_011830701.1; NC_008825.1.
DR AlphaFoldDB; A2SKI9; -.
DR STRING; 420662.Mpe_A3125; -.
DR KEGG; mpt:Mpe_A3125; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_6_0_4; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000000366; 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:ABM96078.1};
KW Pyridoxal phosphate {ECO:0000256|ARBA:ARBA00022898,
KW ECO:0000256|RuleBase:RU362012};
KW Reference proteome {ECO:0000313|Proteomes:UP000000366};
KW Repeat {ECO:0000256|ARBA:ARBA00022737}.
FT DOMAIN 352..423
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT DOMAIN 446..517
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
FT REGION 1..20
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
SQ SEQUENCE 526 AA; 58237 MW; CFE7D4F66B96F9A9 CRC64;
MARAAPRPAP RTSVAKPALR KAGAKPDYLQ RILTARVYDV AIESALQFAP QLSERMGNQV
WLKREDEQAV FSFKLRGAYN KMAHLSPQQL GRGVICASAG NHAQGVALSA RKLRCQATVV
MPVTTPQLKI EAVRALGGKV VLHGESYSDA YAHALKLERE HGQTFVHPFD DPDVIAGQGT
IAMEILRQHQ GPIDAVFVAV GGGGLISGIA AYIKAVRPEI QVIGVQTTDS DAMLRSVRAG
KRVTLHDVGL FSDGTAVKLV GEETFRLTKQ WVDDFEVVDT DAVCAAIKDV FQDTRSILEP
AGALGVAAIK QYTARTGCKG KTFVAITCGA NMNFDRLRFV AERAEVGEER EALFAVTIPE
ERGSFKRFCE LLGPRSVTEF NYRISDAQTA QVFVGLSTRE HGESARIAER FEKQGFATVD
LTHDELAKTH IRHMVGGRSE LAREERLFRF VFPERPGALM RFLTRMHPDW NISLFHYRNQ
GADYGRILVG LQIPRGAQRA LREFLSTLDY PCVEETDNPV YQLFLR
//
