NANM_ECO24
ID NANM_ECO24 Reviewed; 368 AA.
AC A7ZVK8;
DT 20-MAY-2008, integrated into UniProtKB/Swiss-Prot.
DT 23-OCT-2007, sequence version 1.
DT 25-MAY-2022, entry version 81.
DE RecName: Full=N-acetylneuraminate epimerase {ECO:0000255|HAMAP-Rule:MF_01195};
DE EC=5.1.3.24 {ECO:0000255|HAMAP-Rule:MF_01195};
DE AltName: Full=N-acetylneuraminate mutarotase {ECO:0000255|HAMAP-Rule:MF_01195};
DE Short=Neu5Ac mutarotase {ECO:0000255|HAMAP-Rule:MF_01195};
DE AltName: Full=Sialic acid epimerase {ECO:0000255|HAMAP-Rule:MF_01195};
DE Flags: Precursor;
GN Name=nanM {ECO:0000255|HAMAP-Rule:MF_01195};
GN OrderedLocusNames=EcE24377A_4909;
OS Escherichia coli O139:H28 (strain E24377A / ETEC).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC Enterobacteriaceae; Escherichia.
OX NCBI_TaxID=331111;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=E24377A / ETEC;
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: Converts alpha-N-acetylneuranimic acid (Neu5Ac) to the beta-
CC anomer, accelerating the equilibrium between the alpha- and beta-
CC anomers. Probably facilitates sialidase-negative bacteria to compete
CC sucessfully for limited amounts of extracellular Neu5Ac, which is
CC likely taken up in the beta-anomer. In addition, the rapid removal of
CC sialic acid from solution might be advantageous to the bacterium to
CC damp down host responses. {ECO:0000255|HAMAP-Rule:MF_01195}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=N-acetyl-alpha-neuraminate = N-acetyl-beta-neuraminate;
CC Xref=Rhea:RHEA:25233, ChEBI:CHEBI:58705, ChEBI:CHEBI:58770;
CC EC=5.1.3.24; Evidence={ECO:0000255|HAMAP-Rule:MF_01195};
CC -!- SUBUNIT: Homodimer. {ECO:0000255|HAMAP-Rule:MF_01195}.
CC -!- SUBCELLULAR LOCATION: Periplasm {ECO:0000255|HAMAP-Rule:MF_01195}.
CC -!- SIMILARITY: Belongs to the NanM family. {ECO:0000255|HAMAP-
CC Rule:MF_01195}.
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DR EMBL; CP000800; ABV19768.1; -; Genomic_DNA.
DR RefSeq; WP_001407302.1; NC_009801.1.
DR AlphaFoldDB; A7ZVK8; -.
DR SMR; A7ZVK8; -.
DR EnsemblBacteria; ABV19768; ABV19768; EcE24377A_4909.
DR KEGG; ecw:EcE24377A_4909; -.
DR HOGENOM; CLU_061535_0_0_6; -.
DR OMA; PSTNKWR; -.
DR Proteomes; UP000001122; Chromosome.
DR GO; GO:0042597; C:periplasmic space; IEA:UniProtKB-SubCell.
DR GO; GO:0016857; F:racemase and epimerase activity, acting on carbohydrates and derivatives; IEA:UniProtKB-UniRule.
DR GO; GO:0005975; P:carbohydrate metabolic process; IEA:UniProtKB-KW.
DR Gene3D; 2.120.10.80; -; 2.
DR HAMAP; MF_01195; NanM; 1.
DR InterPro; IPR015915; Kelch-typ_b-propeller.
DR InterPro; IPR019936; Mutatrotase_YjhT-like.
DR SUPFAM; SSF117281; SSF117281; 1.
DR TIGRFAMs; TIGR03547; muta_rot_YjhT; 1.
PE 3: Inferred from homology;
KW Carbohydrate metabolism; Isomerase; Kelch repeat; Periplasm; Repeat;
KW Signal.
FT SIGNAL 1..19
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01195"
FT CHAIN 20..368
FT /note="N-acetylneuraminate epimerase"
FT /id="PRO_0000333054"
FT REPEAT 40..84
FT /note="Kelch 1"
FT REPEAT 86..137
FT /note="Kelch 2"
FT REPEAT 139..173
FT /note="Kelch 3"
FT REPEAT 174..219
FT /note="Kelch 4"
FT REPEAT 222..265
FT /note="Kelch 5"
FT REPEAT 287..336
FT /note="Kelch 6"
FT REPEAT 338..367
FT /note="Kelch 7"
FT ACT_SITE 228
FT /note="Proton acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01195"
SQ SEQUENCE 368 AA; 39586 MW; 72549F4C0A779A8F CRC64;
MNKTITALAI IMASFAANAS VLPETPVPFK SGTGAIDNDT VYIGLGSAGT AWYKLDTQAK
DKKWTALAAF PGGPRDQATS AFIDGNLYVF GGIGKNSEGL TQVFNDVHKY NPKTNSWVKL
MSHAPMGMAG HVTFVHNGKA YVTGGVNQNI FNGYFEDLNE AGKDSTAVDK INAYYFDKKA
EDYFFNKFLL SFDPSTQQWS YAGESPWYGT AGAAVVNKGD KTWLINGEAK PGLRTDAVFE
LDFTGNNLKW NKLAPVSSPD GVAGGFAGIS NDSLIFAGGA GFKGSRENYQ NGKNYAHEGL
KKSYSTDIHL WHNGKWDKSG ELSQGRAYGV SLPWNNSLLI IGGETAGGKA VTDSVFISVK
DNKVTVQN