Entry
Name
UDP-N-acetylglucosamine 2-epimerase (hydrolysing);
UDP-N-acetylglucosamine 2-epimerase (ambiguous);
GNE (gene name);
siaA (gene name);
neuC (gene name)
Class
Hydrolases;
Glycosylases;
Glycosidases, i.e. enzymes that hydrolyse O- and S-glycosyl compounds
BRITE hierarchy
Sysname
UDP-N-acetyl-alpha-D-glucosamine hydrolase (2-epimerising)
Reaction(IUBMB)
UDP-N-acetyl-alpha-D-glucosamine + H2O = N-acetyl-D-mannosamine + UDP [RN:
R00414 ]
Reaction(KEGG)
Substrate
UDP-N-acetyl-alpha-D-glucosamine [CPD:
C00043 ];
H2O [CPD:
C00001 ]
Product
Comment
The enzyme is found in mammalian liver, as well as in some pathogenic bacteria including Neisseria meningitidis and Staphylococcus aureus. It catalyses the first step of sialic acid (N-acetylneuraminic acid) biosynthesis. The initial product formed is the alpha anomer, which rapidly mutarotates to a mixture of anomers [2]. The mammalian enzyme is bifunctional and also catalyses EC
2.7.1.60 , N-acetylmannosamine kinase.
cf. EC
5.1.3.14 , UDP-N-acetylglucosamine 2-epimerase (non-hydrolysing).
History
EC 3.2.1.183 created 2012
Pathway
ec00520 Amino sugar and nucleotide sugar metabolism
ec00541 O-Antigen nucleotide sugar biosynthesis
Orthology
K08068 UDP-N-acetylglucosamine 2-epimerase (hydrolysing)
K12409 bifunctional UDP-N-acetylglucosamine 2-epimerase / N-acetylmannosamine kinase
K24257 UDP-N-acetylglucosamine 2-epimerase (hydrolysing)
Genes
PVT : 110070094 110077833(GNE)
XLA : 108703722(gne.S) 108713394(gne.L)
SANH : 107665959 107692604
CAUA : 113044323 113105655
CGIB : 127949382 127975837
MASI : 127443665 127445270
CUD : 121508197(gne) 121508704
SSEN : 122760387 122771022(gne)
SASA : 106602595 106609886
STRU : 115191847 115202183
OMY : 110498664 110534456(gne)
OGO : 124001482 124012377(gne)
SALP : 111971595 112068287
SNH : 120034994(gne) 120052903
AANG : 118227328(gne) 118231256
ARUT : 117408557 117421398
BBEL : 109474908 109478571
ECOO : ECRM13514_2760(nnaA)
ECOH : ECRM13516_2628(nnaA)
ECOI : ECOPMV1_03250(neuC)
LRI : NCTC12151_01028(neuC)
ASI : ASU2_01195 ASU2_10555
ADP : NCTC12871_01318(neuC)
RPNE : NCTC8284_01160(neuC_1)
NMQ : NMBM04240196_0080(siaA)
NMZ : NMBNZ0533_0076(siaA)
NWE : SAMEA3174300_1368(synX)
LVS : LOKVESSMR4R_00716(siaA)
HCL : NCTC13205_00837(neuC)
SYNW : SynWH8103_00492(neuC)
FPOL : ERS445057_00377(neuC)
PHG : KCTC32516_01883(siaA)
PROC : Ptc2401_00367(siaA)
» show all
Taxonomy
Reference
Authors
Stasche R, Hinderlich S, Weise C, Effertz K, Lucka L, Moormann P, Reutter W
Title
A bifunctional enzyme catalyzes the first two steps in N-acetylneuraminic acid biosynthesis of rat liver. Molecular cloning and functional expression of UDP-N-acetyl-glucosamine 2-epimerase/N-acetylmannosamine kinase.
Journal
Sequence
Reference
Authors
Chou WK, Hinderlich S, Reutter W, Tanner ME
Title
Sialic acid biosynthesis: stereochemistry and mechanism of the reaction catalyzed by the mammalian UDP-N-acetylglucosamine 2-epimerase.
Journal
Reference
Authors
Blume A, Ghaderi D, Liebich V, Hinderlich S, Donner P, Reutter W, Lucka L
Title
UDP-N-acetylglucosamine 2-epimerase/N-acetylmannosamine kinase, functionally expressed in and purified from Escherichia coli, yeast, and insect cells.
Journal
Reference
Authors
Murkin AS, Chou WK, Wakarchuk WW, Tanner ME
Title
Identification and mechanism of a bacterial hydrolyzing UDP-N-acetylglucosamine 2-epimerase.
Journal
Sequence
Other DBs
ExPASy - ENZYME nomenclature database: 3.2.1.183