ID A4INX8_GEOTN Unreviewed; 350 AA.
AC A4INX8;
DT 01-MAY-2007, integrated into UniProtKB/TrEMBL.
DT 01-MAY-2007, sequence version 1.
DT 27-MAR-2024, entry version 91.
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=GTNG_1668 {ECO:0000313|EMBL:ABO67032.1};
OS Geobacillus thermodenitrificans (strain NG80-2).
OC Bacteria; Bacillota; Bacilli; Bacillales; Bacillaceae; Geobacillus.
OX NCBI_TaxID=420246 {ECO:0000313|EMBL:ABO67032.1, ECO:0000313|Proteomes:UP000001578};
RN [1] {ECO:0000313|EMBL:ABO67032.1, ECO:0000313|Proteomes:UP000001578}
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=NG80-2 {ECO:0000313|EMBL:ABO67032.1,
RC ECO:0000313|Proteomes:UP000001578};
RX PubMed=17372208; DOI=10.1073/pnas.0609650104;
RA Feng L., Wang W., Cheng J., Ren Y., Zhao G., Gao C., Tang Y., Liu X.,
RA Han W., Peng X., Liu R., Wang L.;
RT "Genome and proteome of long-chain alkane degrading Geobacillus
RT thermodenitrificans NG80-2 isolated from a deep-subsurface oil reservoir.";
RL Proc. Natl. Acad. Sci. U.S.A. 104:5602-5607(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|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; CP000557; ABO67032.1; -; Genomic_DNA.
DR AlphaFoldDB; A4INX8; -.
DR KEGG; gtn:GTNG_1668; -.
DR eggNOG; COG1171; Bacteria.
DR HOGENOM; CLU_021152_4_2_9; -.
DR UniPathway; UPA00047; UER00054.
DR Proteomes; UP000001578; Chromosome.
DR GO; GO:0004794; F:L-threonine ammonia-lyase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0009097; P:isoleucine biosynthetic process; IEA:UniProtKB-UniRule.
DR CDD; cd04907; ACT_ThrD-I_2; 1.
DR CDD; cd01562; Thr-dehyd; 1.
DR Gene3D; 3.40.50.1100; -; 1.
DR InterPro; IPR045865; ACT-like_dom_sf.
DR InterPro; IPR011820; IlvA.
DR InterPro; IPR001721; TD_ACT-like.
DR InterPro; IPR038110; TD_ACT-like_sf.
DR InterPro; IPR001926; TrpB-like_PALP.
DR InterPro; IPR036052; TrpB-like_PALP_sf.
DR NCBIfam; TIGR02079; THD1; 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; 1.
DR SUPFAM; SSF55021; ACT-like; 1.
DR SUPFAM; SSF53686; Tryptophan synthase beta subunit-like PLP-dependent enzymes; 1.
DR PROSITE; PS51672; ACT_LIKE; 1.
DR PROSITE; PS51257; PROKAR_LIPOPROTEIN; 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}.
FT DOMAIN 267..341
FT /note="ACT-like"
FT /evidence="ECO:0000259|PROSITE:PS51672"
SQ SEQUENCE 350 AA; 38279 MW; 66FE239931BD72F8 CRC64;
MRSEETGSYA PAPATMPQGV AYSCRALGVH GKIYMPATTP RQKVSQVQLF GKDKVEIVLV
GDTFDDSYSE AVKCAEAEGR TFIHPFDDEY VIAGQGTIGV EVLNDCDEPI DFLFASIGGG
GLMAGLGTYV KSISPATKVI GVEPGGAPSM KAALEQGHVV TLGEIDKFVD GAAVKTVGEK
TFALCREVLD DIIVVPEGKV CTTILELYNE NAIVAEPAGA LPIAALEFYK EQIRDKTVVC
VVSGGNNDID RMQEIKERSM IYEGLQHYFI VNFPQRAGAL REFLDEVLGP TDDITRFEYT
KKNNKESGPA LVGIELKRRE DYAPLIERMK KKGFPFQEVN KDQNLFHLLI
//
