NANM_SHIBS
ID NANM_SHIBS Reviewed; 368 AA.
AC Q31T32;
DT 20-MAY-2008, integrated into UniProtKB/Swiss-Prot.
DT 20-MAY-2008, sequence version 2.
DT 25-MAY-2022, entry version 86.
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}; OrderedLocusNames=SBO_4360;
OS Shigella boydii serotype 4 (strain Sb227).
OC Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC Enterobacteriaceae; Shigella.
OX NCBI_TaxID=300268;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=Sb227;
RX PubMed=16275786; DOI=10.1093/nar/gki954;
RA Yang F., Yang J., Zhang X., Chen L., Jiang Y., Yan Y., Tang X., Wang J.,
RA Xiong Z., Dong J., Xue Y., Zhu Y., Xu X., Sun L., Chen S., Nie H., Peng J.,
RA Xu J., Wang Y., Yuan Z., Wen Y., Yao Z., Shen Y., Qiang B., Hou Y., Yu J.,
RA Jin Q.;
RT "Genome dynamics and diversity of Shigella species, the etiologic agents of
RT bacillary dysentery.";
RL Nucleic Acids Res. 33:6445-6458(2005).
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}.
CC -!- SEQUENCE CAUTION:
CC Sequence=ABB68776.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR EMBL; CP000036; ABB68776.1; ALT_INIT; Genomic_DNA.
DR RefSeq; WP_004988667.1; NC_007613.1.
DR AlphaFoldDB; Q31T32; -.
DR SMR; Q31T32; -.
DR EnsemblBacteria; ABB68776; ABB68776; SBO_4360.
DR KEGG; sbo:SBO_4360; -.
DR HOGENOM; CLU_061535_0_0_6; -.
DR Proteomes; UP000007067; 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; IPR006652; Kelch_1.
DR InterPro; IPR019936; Mutatrotase_YjhT-like.
DR Pfam; PF01344; Kelch_1; 1.
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_0000333069"
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; 39662 MW; 7233D90F03CF523D CRC64;
MNKTITALAI MMASFAANAS VLPETPVPFK SGTGAIDNDT VYIGLGSAGT AWYKLDTQAK
DKKWTALAAF PGGPRDQATS AFIDGNLYVF GGIGKNREGL TQVFNDVHKY NPKTNSWVKL
MSHAPMGMAG HVTFVHNGKA YVTGGVNQNI FNGYFEDLNE AGKDSTAVDK INAYYFDKKA
EDYFFNKFLL SFDPSTQQWS YAGESPWYGT AGAAVVNKGD KTWLINGEAK PGLRTDAVFE
LDFTGNNLKW NKLAPVSSPD GVAGGFAGIS NDSLIFAGGA GFKGSRENYQ HGKNYAHEGL
KKSYSTDIHL WHNGKWDKSG ELSQGRAYGV SLPWNNSLLI IGGETAGGKA VTDSVLISVK
DNKVTVQN
