Browsing Pathways

The pathway begins with the introduction of deoxycytidine into the cytosol, either through a nupG symporter or a nupC symporter. Once inside it is deaminated when reacting with a water molecule, a hydrogen ion and a deoxycytidine deaminase resulting in the release of an ammonium and a deoxyuridine. Deoxyuridine can also be imported through a nupG symporter or a nupC symporter. Deoxyuridine can react with an ATP through a deoxyuridine kinase resulting in the release of a ADP , a hydrogen ion and a dUMP. Deoxyuridine can also react with a phosphate through a uracil phosphorylase resulting in the release of a uracil and a deoxy-alpha-D-ribose 1-phosphate. This compound in turn reacts with a thymine through a thymidine phosphorylase resulting in the release of a phosphate and a thymidine. Thymidine in turn reacts with an ATP through a thymidine kinase resulting in a release of an ADP, a hydrogen ion and a dTMP

The salvage of adenine begins with adenine being transporter into the cytosol through a adeP hydrogen symporter. Once in the cytosol adenine is degraded by reacting with a ribose-1-phosphate through an adenosine phosphorylase resulting in the release of a phosphate and adenosine. Adenosine is then deaminated by reacting with water, a hydrogen ion and an adenosine deaminase resulting in the release of an ammonium and a inosine . Inosine then reacts with a phosphate through a inosine phosphorylase resulting in the release of a ribose 1-phosphate and a hypoxanthine. Hypoxanthine reacts with a PRPP through a hypoxanthine phosphoribosyltransferase resulting in the release of a pyrophosphate and a IMP molecule.

The salvage of adenine begins with adenine being transporter into the cytosol through a adeP hydrogen symporter. Once in the cytosol adenine is degraded by reacting with a ribose-1-phosphate through an adenosine phosphorylase resulting in the release of a phosphate and adenosine. Adenosine is then deaminated by reacting with water, a hydrogen ion and an adenosine deaminase resulting in the release of an ammonium and a inosine . Inosine then reacts with a phosphate through a inosine phosphorylase resulting in the release of a ribose 1-phosphate and a hypoxanthine. Hypoxanthine reacts with a PRPP through a hypoxanthine phosphoribosyltransferase resulting in the release of a pyrophosphate and a IMP molecule.

The degradation of propanoyl-CoA starts with propanoyl-CoA undergoing a decarboxylase reaction by reacting with hydrogen carbonate and ATP resulting in the release of a phosphate, an ADP, a hydrogen ion and an S-methylmalonyl-CoA. This compound in turn reacts through an epimerase reaction resulting in the release of a R-methylmalonyl-CoA. This compound in turn can undergo a reversible reaction through a methylmalonyl-CoA mutase resulting in the release of a succinyl-CoA. This compound can be converted back to R-methylmalonyl-CoA through a methylmalonyl-CoA mutase. Methylmalonyl-CoA can then be converted into propanoyl-CoA through a methylmalonyl CoA decarboxylase . This compound in turn reacts with a succinate through a propionyl-CoA succinate CoA transferase resulting in the release of a propanoate and a succinyl-CoA.

The degradation of propanoyl-CoA starts with propanoyl-CoA undergoing a decarboxylase reaction by reacting with hydrogen carbonate and ATP resulting in the release of a phosphate, an ADP, a hydrogen ion and an S-methylmalonyl-CoA. This compound in turn reacts through an epimerase reaction resulting in the release of a R-methylmalonyl-CoA. This compound in turn can undergo a reversible reaction through a methylmalonyl-CoA mutase resulting in the release of a succinyl-CoA. This compound can be converted back to R-methylmalonyl-CoA through a methylmalonyl-CoA mutase. Methylmalonyl-CoA can then be converted into propanoyl-CoA through a methylmalonyl CoA decarboxylase . This compound in turn reacts with a succinate through a propionyl-CoA succinate CoA transferase resulting in the release of a propanoate and a succinyl-CoA.

Thiosulfate sulfurtransferase (also known as rhodanese) can facilitate the transfer of a sulfur atom from sulfur donors to nucleophilic sulfur acceptors, and it has been found in many major phyla (prokaryotic and eukaryotic). The role of thiosulfate sulfurtransferase might be the detoxification of cyanide in both bacteria and mammals, or it might also involve in formation of prosthetic groups in iron-sulfur proteins. In this pathway, thiosulfate and hydrogen cyanide have been catalyzed by thiosulfate sulfurtransferase to form thiocyanate and sulfite. Sulfite is used in later sulfur metabolism.

This pathway demonstrates the degradation of extracellular putrescine in E.coli. Putrescine is imported by putrescine transporter (encoded by puuP gene). Putrescine is γ-glutamylated by activation of ATP which generates γ-glutamyl-putrescine, phosphate, and ADP. γ-glutamyl-putrescine is oxidized by gamma-glutamylputrescine oxidoreductase to form γ-glutamyl-γ-butyraldehyde, also produce ammonium and water. Gamma-glutamyl-gamma-aminobutyraldehyde dehydrogenase dehydrogenates γ-glutamyl-γ-butyraldehyde to γ-glutamyl-γ-aminobutyrate, which is then dehydrogenated into γ-Aminobutyric acid and L-Glutamic acid by γ-glutamyl-γ-aminobutyrate hydrolase.

Most bacteria, including Escherichia coli, are composed of murein which protects and stabilizes the cell wall. Over half of the murein is broken down by Escherichia coli and recycled for the next generation. The main muropeptide is GlcNAc-anhydro-N-acetylmuramic acid (anhMurNAc)-l-Ala-γ-d-Glu-meso-Dap-d-Ala which enters the cytoplasm by AmpG protein. The peptide is then released from the muropeptide. 1,6-Anhydro-N-acetylmuramic acid (anhMurNAc) is recycled by its conversion to N-acetylglucosamine-phosphate (GlcNAc-P). The sugar is phosphorylated by anhydro-N-acetylmuramic acid kinase (AnmK) to produce MurNAc-P. Etherase cleaves MurNAc-P to produce N-acetyl-D-glucosamine 6-phosphate. The product can undergo further degradation or be recycled into peptidoglycan monomers. The pathway's final product is a peptidoglycan biosynthesis precursor, UDP-N-acetyl-α-D-muramate. The enzyme muropeptide ligase (mpl), attaches the recovered Ala-Glu-DAP tripeptide to the precursor UDP-N-acetyl-α-D-muramate to return to the peptide to the peptidoglycan biosynthetic pathway to synthesize the cell wall.

The degradation of propanoyl-CoA starts with propanoyl-CoA undergoing a decarboxylase reaction by reacting with hydrogen carbonate and ATP resulting in the release of a phosphate, an ADP, a hydrogen ion and an S-methylmalonyl-CoA. This compound in turn reacts through an epimerase reaction resulting in the release of a R-methylmalonyl-CoA. This compound in turn can undergo a reversible reaction through a methylmalonyl-CoA mutase resulting in the release of a succinyl-CoA. This compound can be converted back to R-methylmalonyl-CoA through a methylmalonyl-CoA mutase. Methylmalonyl-CoA can then be converted into propanoyl-CoA through a methylmalonyl CoA decarboxylase . This compound in turn reacts with a succinate through a propionyl-CoA succinate CoA transferase resulting in the release of a propanoate and a succinyl-CoA.

Fructosamines are compounds that result from glycation reactions between a sugar and a primary amine, followed by isomerization via the Amadori rearrangement. In fructoselysine degradation, fructoselysine firstly converts to 1-[(5-Amino-5-carboxypentyl)amino]-1-deoxyfructose by protein frlC, and then 1-[(5-Amino-5-carboxypentyl)amino]-1-deoxyfructose is transformed to fructoselysine-6-phosphate by fructoselysine kinase which is powered by ATP. Fructoselysine-6-phosphate finally degrades to β-D-Glucose 6-phosphate and L-lysine by fructoselysine 6-phosphate deglycase.