ID   ILVA_STAS1              Reviewed;         422 AA.
AC   Q49Z16;
DT   16-MAY-2006, integrated into UniProtKB/Swiss-Prot.
DT   13-SEP-2005, sequence version 1.
DT   03-AUG-2022, entry version 108.
DE   RecName: Full=L-threonine dehydratase biosynthetic IlvA;
DE            EC=4.3.1.19;
DE   AltName: Full=Threonine deaminase;
GN   Name=ilvA; OrderedLocusNames=SSP0817;
OS   Staphylococcus saprophyticus subsp. saprophyticus (strain ATCC 15305 / DSM
OS   20229 / NCIMB 8711 / NCTC 7292 / S-41).
OC   Bacteria; Firmicutes; Bacilli; Bacillales; Staphylococcaceae;
OC   Staphylococcus.
OX   NCBI_TaxID=342451;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 15305 / DSM 20229 / NCIMB 8711 / NCTC 7292 / S-41;
RX   PubMed=16135568; DOI=10.1073/pnas.0502950102;
RA   Kuroda M., Yamashita A., Hirakawa H., Kumano M., Morikawa K., Higashide M.,
RA   Maruyama A., Inose Y., Matoba K., Toh H., Kuhara S., Hattori M., Ohta T.;
RT   "Whole genome sequence of Staphylococcus saprophyticus reveals the
RT   pathogenesis of uncomplicated urinary tract infection.";
RL   Proc. Natl. Acad. Sci. U.S.A. 102:13272-13277(2005).
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 (By similarity).
CC       {ECO:0000250}.
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   -!- COFACTOR:
CC       Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC         Evidence={ECO:0000250};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-isoleucine biosynthesis; 2-
CC       oxobutanoate from L-threonine: step 1/1.
CC   -!- SUBUNIT: Homotetramer. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the serine/threonine dehydratase family.
CC       {ECO:0000305}.
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DR   EMBL; AP008934; BAE17962.1; -; Genomic_DNA.
DR   RefSeq; WP_011302710.1; NZ_MTGA01000028.1.
DR   AlphaFoldDB; Q49Z16; -.
DR   SMR; Q49Z16; -.
DR   STRING; 342451.SSP0817; -.
DR   PRIDE; Q49Z16; -.
DR   EnsemblBacteria; BAE17962; BAE17962; SSP0817.
DR   KEGG; ssp:SSP0817; -.
DR   PATRIC; fig|342451.11.peg.819; -.
DR   eggNOG; COG1171; Bacteria.
DR   HOGENOM; CLU_021152_4_2_9; -.
DR   OMA; VNFPQRA; -.
DR   OrthoDB; 1876944at2; -.
DR   UniPathway; UPA00047; UER00054.
DR   Proteomes; UP000006371; Chromosome.
DR   GO; GO:0004794; F:L-threonine ammonia-lyase activity; IEA:UniProtKB-EC.
DR   GO; GO:0030170; F:pyridoxal phosphate binding; IEA:InterPro.
DR   GO; GO:0009097; P:isoleucine biosynthetic process; IEA:UniProtKB-UniPathway.
DR   GO; GO:0006566; P:threonine metabolic process; ISS:UniProtKB.
DR   Gene3D; 3.40.50.1100; -; 2.
DR   InterPro; IPR045865; ACT-like_dom_sf.
DR   InterPro; IPR011820; IlvA.
DR   InterPro; IPR001926; PLP-dep.
DR   InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR   InterPro; IPR001721; TD_ACT-like.
DR   InterPro; IPR036052; Trypto_synt_PLP_dependent.
DR   Pfam; PF00291; PALP; 1.
DR   Pfam; PF00585; Thr_dehydrat_C; 1.
DR   SUPFAM; SSF53686; SSF53686; 1.
DR   SUPFAM; SSF55021; SSF55021; 1.
DR   TIGRFAMs; TIGR02079; THD1; 1.
DR   PROSITE; PS51672; ACT_LIKE; 1.
DR   PROSITE; PS00165; DEHYDRATASE_SER_THR; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; Branched-chain amino acid biosynthesis;
KW   Isoleucine biosynthesis; Lyase; Pyridoxal phosphate; Reference proteome.
FT   CHAIN           1..422
FT                   /note="L-threonine dehydratase biosynthetic IlvA"
FT                   /id="PRO_0000234315"
FT   DOMAIN          339..413
FT                   /note="ACT-like"
FT                   /evidence="ECO:0000255|PROSITE-ProRule:PRU01008"
FT   BINDING         83
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250"
FT   BINDING         189..193
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250"
FT   BINDING         315
FT                   /ligand="pyridoxal 5'-phosphate"
FT                   /ligand_id="ChEBI:CHEBI:597326"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         56
FT                   /note="N6-(pyridoxal phosphate)lysine"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   422 AA;  46840 MW;  4BADCC7143465109 CRC64;
     MTVKTTVSSK DIDEAYLQLK DIVKETPLQK DHYLSQKYDC KVYLKREDLQ WVRSFKLRGA
     YNAIIALDEA DRQNGITCAS AGNHAQGVAY TASKLNLNAV IFMPVTTPLQ KINQVKFFGG
     DNTEVVLTGD TFDDCLKEAL VYTEENKMNF IDPFNNIYTI AGQGTLAKEI LEQSKDNDIQ
     FDYLFAAIGG GGLISGVGTY FKTHSPETSI IGVEPAGAAS MYTSVVLENQ LVTLPDIDKF
     VDGASVARVG QITFDISKDI VDDYIQVHEG AVCSTILDMY SKQAIIAEPA GALSIAALDQ
     YQAEIKGKTV VCVVSGGNND INRMKEIEER SLLFEEMKHY FILNFPQRPG ALREFVNEVL
     GPKDDITKFE YLKKSSQNTG TVIIGIQLNN HKDLGHLKAN VDEFDKSNIY INENKMLYSL
     LI