ID   RHMD_SALHS              Reviewed;         401 AA.
AC   B4TBF8;
DT   28-JUL-2009, integrated into UniProtKB/Swiss-Prot.
DT   23-SEP-2008, sequence version 1.
DT   03-AUG-2022, entry version 78.
DE   RecName: Full=L-rhamnonate dehydratase {ECO:0000255|HAMAP-Rule:MF_01288};
DE            Short=RhamD {ECO:0000255|HAMAP-Rule:MF_01288};
DE            EC=4.2.1.90 {ECO:0000255|HAMAP-Rule:MF_01288};
GN   Name=rhmD {ECO:0000255|HAMAP-Rule:MF_01288}; OrderedLocusNames=SeHA_C2531;
OS   Salmonella heidelberg (strain SL476).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Salmonella.
OX   NCBI_TaxID=454169;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=SL476;
RX   PubMed=21602358; DOI=10.1128/jb.00297-11;
RA   Fricke W.F., Mammel M.K., McDermott P.F., Tartera C., White D.G.,
RA   Leclerc J.E., Ravel J., Cebula T.A.;
RT   "Comparative genomics of 28 Salmonella enterica isolates: evidence for
RT   CRISPR-mediated adaptive sublineage evolution.";
RL   J. Bacteriol. 193:3556-3568(2011).
CC   -!- FUNCTION: Catalyzes the dehydration of L-rhamnonate to 2-keto-3-deoxy-
CC       L-rhamnonate (KDR). {ECO:0000255|HAMAP-Rule:MF_01288}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=L-rhamnonate = 2-dehydro-3-deoxy-L-rhamnonate + H2O;
CC         Xref=Rhea:RHEA:23080, ChEBI:CHEBI:15377, ChEBI:CHEBI:58118,
CC         ChEBI:CHEBI:58371; EC=4.2.1.90; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01288};
CC   -!- COFACTOR:
CC       Name=Mg(2+); Xref=ChEBI:CHEBI:18420;
CC         Evidence={ECO:0000255|HAMAP-Rule:MF_01288};
CC       Note=Binds 1 Mg(2+) ion per subunit. {ECO:0000255|HAMAP-Rule:MF_01288};
CC   -!- SUBUNIT: Homooctamer; tetramer of dimers. {ECO:0000255|HAMAP-
CC       Rule:MF_01288}.
CC   -!- MISCELLANEOUS: Reaction proceeds via a syn dehydration.
CC       {ECO:0000255|HAMAP-Rule:MF_01288}.
CC   -!- SIMILARITY: Belongs to the mandelate racemase/muconate lactonizing
CC       enzyme family. RhamD subfamily. {ECO:0000255|HAMAP-Rule:MF_01288}.
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DR   EMBL; CP001120; ACF69822.1; -; Genomic_DNA.
DR   AlphaFoldDB; B4TBF8; -.
DR   SMR; B4TBF8; -.
DR   KEGG; seh:SeHA_C2531; -.
DR   HOGENOM; CLU_030273_1_0_6; -.
DR   OMA; HFVISQP; -.
DR   Proteomes; UP000001866; Chromosome.
DR   GO; GO:0050032; F:L-rhamnonate dehydratase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0000287; F:magnesium ion binding; IEA:UniProtKB-UniRule.
DR   GO; GO:0009063; P:cellular amino acid catabolic process; IEA:InterPro.
DR   CDD; cd03327; MR_like_2; 1.
DR   Gene3D; 3.20.20.120; -; 1.
DR   Gene3D; 3.30.390.10; -; 1.
DR   HAMAP; MF_01288; Rhamnon_dehydrat; 1.
DR   InterPro; IPR036849; Enolase-like_C_sf.
DR   InterPro; IPR029017; Enolase-like_N.
DR   InterPro; IPR029065; Enolase_C-like.
DR   InterPro; IPR023444; L-Rhamnon_dehydrat.
DR   InterPro; IPR018110; Mandel_Rmase/mucon_lact_enz_CS.
DR   InterPro; IPR013342; Mandelate_racemase_C.
DR   InterPro; IPR013341; Mandelate_racemase_N_dom.
DR   Pfam; PF13378; MR_MLE_C; 1.
DR   Pfam; PF02746; MR_MLE_N; 1.
DR   SFLD; SFLDF00006; rhamnonate_dehydratase; 1.
DR   SMART; SM00922; MR_MLE; 1.
DR   SUPFAM; SSF51604; SSF51604; 1.
DR   SUPFAM; SSF54826; SSF54826; 1.
DR   PROSITE; PS00908; MR_MLE_1; 1.
PE   3: Inferred from homology;
KW   Lyase; Magnesium; Metal-binding.
FT   CHAIN           1..401
FT                   /note="L-rhamnonate dehydratase"
FT                   /id="PRO_1000165264"
FT   ACT_SITE        325
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         29
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         55
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         222
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         248
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         276
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         345
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   SITE            298
FT                   /note="Increases basicity of active site His"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   SITE            345
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
SQ   SEQUENCE   401 AA;  44091 MW;  5B6953E74B32555E CRC64;
     MTLPKIKHVR AWFIGGATAE KGAGGGDYHD QGGNHWIADH IATPMSKYRD YEQSRQSFGI
     NVLGTLIVEV EAENGQTGFA VSTAGEMGCF IVEKHLNRFI EGKCVSDIKL IHDQMLGATM
     YYSGSGGLVM NTISCVDLAL WDLFGKVVGL PVYKLLGGAV RDEIQFYATG ARPDLAKEMG
     FIGGKMPTHW GPHDGDAGIR KDAAMVADMR EKCGPDFWLM LDCWMSQDVN YATKLAHACA
     PFNLKWIEEC LPPQQYEGYR ELKRNAPAGM MVTSGEHHGT LQSFRTLSET GIDIMQPDVG
     WCGGLTTLVE IAALAKSRGQ LVVPHGSSVY SHHAVITFTN TPFSEFLMTS PDCSTLRPQF
     DPILLDEPVP VNGRIHKSVL DKPGFGVELN RDCHLKRPYS H