ID   THRC_HAEIN              Reviewed;         425 AA.
AC   P44503;
DT   01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1995, sequence version 1.
DT   03-AUG-2022, entry version 129.
DE   RecName: Full=Threonine synthase;
DE            Short=TS;
DE            EC=4.2.3.1;
GN   Name=thrC; OrderedLocusNames=HI_0087;
OS   Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Pasteurellales;
OC   Pasteurellaceae; Haemophilus.
OX   NCBI_TaxID=71421;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC 51907 / DSM 11121 / KW20 / Rd;
RX   PubMed=7542800; DOI=10.1126/science.7542800;
RA   Fleischmann R.D., Adams M.D., White O., Clayton R.A., Kirkness E.F.,
RA   Kerlavage A.R., Bult C.J., Tomb J.-F., Dougherty B.A., Merrick J.M.,
RA   McKenney K., Sutton G.G., FitzHugh W., Fields C.A., Gocayne J.D.,
RA   Scott J.D., Shirley R., Liu L.-I., Glodek A., Kelley J.M., Weidman J.F.,
RA   Phillips C.A., Spriggs T., Hedblom E., Cotton M.D., Utterback T.R.,
RA   Hanna M.C., Nguyen D.T., Saudek D.M., Brandon R.C., Fine L.D.,
RA   Fritchman J.L., Fuhrmann J.L., Geoghagen N.S.M., Gnehm C.L., McDonald L.A.,
RA   Small K.V., Fraser C.M., Smith H.O., Venter J.C.;
RT   "Whole-genome random sequencing and assembly of Haemophilus influenzae
RT   Rd.";
RL   Science 269:496-512(1995).
CC   -!- FUNCTION: Catalyzes the gamma-elimination of phosphate from L-
CC       phosphohomoserine and the beta-addition of water to produce L-
CC       threonine. {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=H2O + O-phospho-L-homoserine = L-threonine + phosphate;
CC         Xref=Rhea:RHEA:10840, ChEBI:CHEBI:15377, ChEBI:CHEBI:43474,
CC         ChEBI:CHEBI:57590, ChEBI:CHEBI:57926; EC=4.2.3.1;
CC   -!- COFACTOR:
CC       Name=pyridoxal 5'-phosphate; Xref=ChEBI:CHEBI:597326;
CC         Evidence={ECO:0000250};
CC   -!- PATHWAY: Amino-acid biosynthesis; L-threonine biosynthesis; L-threonine
CC       from L-aspartate: step 5/5.
CC   -!- SIMILARITY: Belongs to the threonine synthase family. {ECO:0000305}.
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DR   EMBL; L42023; AAC21765.1; -; Genomic_DNA.
DR   PIR; H64047; H64047.
DR   RefSeq; NP_438260.1; NC_000907.1.
DR   RefSeq; WP_005693831.1; NC_000907.1.
DR   AlphaFoldDB; P44503; -.
DR   SMR; P44503; -.
DR   STRING; 71421.HI_0087; -.
DR   EnsemblBacteria; AAC21765; AAC21765; HI_0087.
DR   KEGG; hin:HI_0087; -.
DR   PATRIC; fig|71421.8.peg.88; -.
DR   eggNOG; COG0498; Bacteria.
DR   HOGENOM; CLU_015170_0_0_6; -.
DR   OMA; KGYLCEP; -.
DR   PhylomeDB; P44503; -.
DR   BioCyc; HINF71421:G1GJ1-92-MON; -.
DR   UniPathway; UPA00050; UER00065.
DR   Proteomes; UP000000579; Chromosome.
DR   GO; GO:0030170; F:pyridoxal phosphate binding; IEA:InterPro.
DR   GO; GO:0004795; F:threonine synthase activity; IEA:UniProtKB-EC.
DR   GO; GO:0009088; P:threonine biosynthetic process; IEA:UniProtKB-UniPathway.
DR   Gene3D; 3.40.50.1100; -; 2.
DR   Gene3D; 3.90.1380.10; -; 1.
DR   InterPro; IPR001926; PLP-dep.
DR   InterPro; IPR000634; Ser/Thr_deHydtase_PyrdxlP-BS.
DR   InterPro; IPR029144; Thr_synth_N.
DR   InterPro; IPR037158; Thr_synth_N_sf.
DR   InterPro; IPR004450; Thr_synthase-like.
DR   InterPro; IPR036052; Trypto_synt_PLP_dependent.
DR   Pfam; PF00291; PALP; 1.
DR   Pfam; PF14821; Thr_synth_N; 1.
DR   SUPFAM; SSF53686; SSF53686; 1.
DR   TIGRFAMs; TIGR00260; thrC; 1.
DR   PROSITE; PS00165; DEHYDRATASE_SER_THR; 1.
PE   3: Inferred from homology;
KW   Amino-acid biosynthesis; Lyase; Pyridoxal phosphate; Reference proteome;
KW   Threonine biosynthesis.
FT   CHAIN           1..425
FT                   /note="Threonine synthase"
FT                   /id="PRO_0000185632"
FT   MOD_RES         105
FT                   /note="N6-(pyridoxal phosphate)lysine"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   425 AA;  46682 MW;  2CC222DD201F09E0 CRC64;
     MNLYNIKHPE EQVTFSQAVR QGLGRDQGLF FPEVIPQLNN INELLELPLV ERSQKILGAL
     IDGELPQATL DAMVKNAFTF PAPLEKVEEN IYALELFHGP TLAFKDFGGR FMAQALAAVR
     GDGKITILTA TSGDTGAAVA HAFYGLENIN VVILYPKGKI SPLQEKLFCT LGGNIRTVAI
     NADFDACQAL VKQAFDDVEL RQAIGLNSAN SINISRLLAQ VCYYFEAVAQ LPKEKRDNVV
     VSVPSGNFGN LTAGLIAKTL GLPIKRFVAS TNANDTVPRY LKSGNWDPKT TVATLSNAMD
     VSRPNNWPRV EELFKRNGWD LTDLGSGMLS DSETEDTLKA MQSKGYLCEP HGAIAYQVLK
     DQLKASETGI FLCTAHPAKF KESVERILGI QLPLPETLDK HNQLPLLSDE MDNDFAQLRA
     YLLKS