ID   RHMD_SALCH              Reviewed;         405 AA.
AC   Q57M62;
DT   14-OCT-2008, integrated into UniProtKB/Swiss-Prot.
DT   14-OCT-2008, sequence version 2.
DT   03-AUG-2022, entry version 88.
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=SCH_2294;
OS   Salmonella choleraesuis (strain SC-B67).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Salmonella.
OX   NCBI_TaxID=321314;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=SC-B67;
RX   PubMed=15781495; DOI=10.1093/nar/gki297;
RA   Chiu C.-H., Tang P., Chu C., Hu S., Bao Q., Yu J., Chou Y.-Y., Wang H.-S.,
RA   Lee Y.-S.;
RT   "The genome sequence of Salmonella enterica serovar Choleraesuis, a highly
RT   invasive and resistant zoonotic pathogen.";
RL   Nucleic Acids Res. 33:1690-1698(2005).
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}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=AAX66200.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; AE017220; AAX66200.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; Q57M62; -.
DR   SMR; Q57M62; -.
DR   EnsemblBacteria; AAX66200; AAX66200; SCH_2294.
DR   KEGG; sec:SCH_2294; -.
DR   HOGENOM; CLU_030273_1_0_6; -.
DR   Proteomes; UP000000538; 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..405
FT                   /note="L-rhamnonate dehydratase"
FT                   /id="PRO_0000351703"
FT   ACT_SITE        329
FT                   /note="Proton acceptor"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         33
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         59
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         226
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         252
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         280
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   BINDING         349
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   SITE            302
FT                   /note="Increases basicity of active site His"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
FT   SITE            349
FT                   /note="Transition state stabilizer"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01288"
SQ   SEQUENCE   405 AA;  44607 MW;  293920BC6B923523 CRC64;
     MENIMTLPKI KHVRAWFIGG ATAEKGAGGG DYHDQGGNHW IDDHIATPMS KYRDYEQSRQ
     SFGINVLGTL IVEVEAENGQ TGFAVSTAGE MGCFIVEKHL NRFIEGKCVS DIKLIHDQML
     GATMYYSGSG GLVMNTISCV DLALWDLFGK VVGLPVYKLL GGAVRDEIQF YATGARPDLA
     KEMGFIGGKM PTHWGPHDGD AGIRKDAAMV ADMREKCGPD FWLMLDCWMS QDVNYATKLA
     HACAPFNLKW IEECLPPQQY EGYRELKRNA PAGMMVTSGE HHGTLQSFRT LAETGIDIMQ
     PDVGWCGGLT TLVEIAALAK SRGQLVVPHG SSVYSHHAVI TFTNTPFSEF LMTSPDCSTL
     RPQFDPILLD EPVPVNGRIH KSVLDKPGFG VELNRDCHLK RPYSH