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Pathway Description
Amino Sugar and Nucleotide Sugar Metabolism II
Escherichia coli O157:H7 str. Sakai
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2025-01-21
Last Updated: 2025-01-21
The synthesis of amino sugars and nucleotide sugars starts with the phosphorylation of N-Acetylmuramic acid (MurNac) through its transport from the periplasmic space to the cytoplasm. Once in the cytoplasm, MurNac and water undergo a reversible reaction through a N-acetylmuramic acid 6-phosphate etherase, producing a D-lactic acid and N-Acetyl-D-Glucosamine 6-phosphate. This latter compound can also be introduced into the cytoplasm through a phosphorylating PTS permase in the inner membrane that allows for the transport of N-Acetyl-D-glucosamine from the periplasmic space. N-Acetyl-D-Glucosamine 6-phosphate can also be obtained from chitin dependent reactions. Chitin is hydrated through a bifunctional chitinase to produce chitobiose. This in turn gets hydrated by a beta-hexosaminidase to produce N-acetyl-D-glucosamine. The latter undergoes an atp dependent phosphorylation leading to the production of N-Acetyl-D-Glucosamine 6-phosphate.
N-Acetyl-D-Glucosamine 6-phosphate is then be deacetylated in order to produce Glucosamine 6-phosphate through a N-acetylglucosamine-6-phosphate deacetylase. This compound can either be isomerized or deaminated into Beta-D-fructofuranose 6-phosphate through a glucosamine-fructose-6-phosphate aminotransferase and a glucosamine-6-phosphate deaminase respectively.
Glucosamine 6-phosphate undergoes a reversible reaction to glucosamine 1 phosphate through a phosphoglucosamine mutase. This compound is then acetylated through a bifunctional protein glmU to produce a N-Acetyl glucosamine 1-phosphate.
N-Acetyl glucosamine 1-phosphate enters the nucleotide sugar synthesis by reacting with UTP and hydrogen ion through a bifunctional protein glmU releasing pyrophosphate and a Uridine diphosphate-N-acetylglucosamine.This compound can either be isomerized into a UDP-N-acetyl-D-mannosamine or undergo a reaction with phosphoenolpyruvic acid through UDP-N-acetylglucosamine 1-carboxyvinyltransferase releasing a phosphate and a UDP-N-Acetyl-alpha-D-glucosamine-enolpyruvate.
UDP-N-acetyl-D-mannosamine undergoes a NAD dependent dehydrogenation through a UDP-N-acetyl-D-mannosamine dehydrogenase, releasing NADH, a hydrogen ion and a UDP-N-Acetyl-alpha-D-mannosaminuronate, This compound is then used in the production of enterobacterial common antigens.
UDP-N-Acetyl-alpha-D-glucosamine-enolpyruvate is reduced through a NADPH dependent UDP-N-acetylenolpyruvoylglucosamine reductase, releasing a NADP and a UDP-N-acetyl-alpha-D-muramate. This compound is involved in the D-glutamine and D-glutamate metabolism.
References
Amino Sugar and Nucleotide Sugar Metabolism II References
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This pathway was propagated using PathWhiz -
Pon, A. et al. Pathways with PathWhiz (2015) Nucleic Acids Res. 43(Web Server issue): W552–W559.
Propagated from SMP0000906
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