ID   RHMD_ECOHS              Reviewed;         405 AA.
AC   A8A2B3;
DT   14-OCT-2008, integrated into UniProtKB/Swiss-Prot.
DT   23-OCT-2007, sequence version 1.
DT   03-AUG-2022, entry version 81.
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=EcHS_A2389;
OS   Escherichia coli O9:H4 (strain HS).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Escherichia.
OX   NCBI_TaxID=331112;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=HS;
RX   PubMed=18676672; DOI=10.1128/jb.00619-08;
RA   Rasko D.A., Rosovitz M.J., Myers G.S.A., Mongodin E.F., Fricke W.F.,
RA   Gajer P., Crabtree J., Sebaihia M., Thomson N.R., Chaudhuri R.,
RA   Henderson I.R., Sperandio V., Ravel J.;
RT   "The pangenome structure of Escherichia coli: comparative genomic analysis
RT   of E. coli commensal and pathogenic isolates.";
RL   J. Bacteriol. 190:6881-6893(2008).
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; CP000802; ABV06667.1; -; Genomic_DNA.
DR   AlphaFoldDB; A8A2B3; -.
DR   SMR; A8A2B3; -.
DR   KEGG; ecx:EcHS_A2389; -.
DR   HOGENOM; CLU_030273_1_0_6; -.
DR   OMA; HFVISQP; -.
DR   Proteomes; UP000001123; 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_0000351699"
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;  44684 MW;  BFF3E82809BD6E17 CRC64;
     MENIMTLPKI KQVRAWFTGG ATAEKGAGGG DYHDQGANHW IDDHIATPMS KYRDYEQSRQ
     SFGINVLGTL VVEVEAENGQ TGFAVSTAGE MGCFIVEKHL NRFIEGKCVS DIKLIHDQML
     SATLYYSGSG GLVMNTISCV DLALWDLFGK VVGLPVYKLL GGAVRDEIQF YATGARPDLA
     KEMGFIGGKM PTHWGPHDGD AGIRKDAAMV ADMREKCGED FWLMLDCWMS QDVNYATKLA
     HACAPYNLKW IEECLPPQQY EGYRELKRNA PVGMMVTSGE HHGTLQSFRT LSETGIDIMQ
     PDVGWCGGLT TLVEIAAIAK SRGQLVVPHG SSVYSHHAVI TFTNTPFSEF LMTSPDCSTM
     RPQFDPILLN EPVPVNGRIH KSVLDKPGFG VELNRDCNLK RPYSH