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Pathway Description
Colanic Acid Building Blocks Biosynthesis
Pseudomonas aeruginosa
Category:
Metabolite Pathway
Sub-Category:
Metabolic
Created: 2025-06-16
Last Updated: 2025-06-16
The colonic acid building blocks biosynthesis starts with a Beta-D-Glucose undergoing a transport reaction mediated by a glucose PTS permease. The permease phosphorylates the Beta-D-Glucose, producing a Beta-D-Glucose 6-phosphate. This compound can either change to an Alpha-D-Glucose 6-phosphate spontaneously or into a fructose 6-phosphate through a glucose-6-phosphate isomerase. The latter compound can also be present in E.coli through the interaction of D-fructose and a mannose PTS permease which phosphorylate the D-fructose.
Fructose 6-phosphate interacts in a reversible reaction with mannose-6-phosphate isomerase in order to produce a Alpha-D-mannose 6-phosphate. This compound can also be present in E.coli through the interaction of Alpha-D-mannose and a mannose PTS permease which phosphorylates the alpha-D-mannose. Alpha-D-mannose 6-phosphate interacts in a reversible reaction with a phosphomannomutase to produce a alpha-D-mannose 1-phosphate. This compound in turn with a hydrogen ion and gtp undergoes a reaction with a mannose-1-phosphate guanylyltransferase, releasing a pyrophosphate and producing a guanosine diphosphate mannose. Guanosine diphosphate mannose interacts with gdp-mannose 4,6-dehydratase releasing a water, and gdp-4-dehydro-6-deoxy-D-mannose. This compound in turn with hydrogen ion and NADPH interact with GDP-L-fucose synthase releasing NADP and producing a GDP-L-fucose.
The Alpha-D-Glucose 6-phosphate interacts in a reversible reaction with phosphoglucomutase-1 to produce a alpha-D-glucose 1-phosphate. This in turn with UTP and hydrogen ion interact with UTP--glucose-1-phosphate uridyleltransferase releasing a pyrophosphate and UDP-glucose.
UDP-glucose can either interact with galactose-1-phosphate uridylyltransferase to produce a UDP-galactose or in turn with NAD and water interact with UDP-glucose 6-dehydrogenase releasing a NADH and a hydrogen ion and producing a UDP-glucuronate.
GDP-L-fucose, UDP-glucose, UDP-galactose and UDP-glucuronate are sugars that need to be activated in the form of nucleotide sugar prior to their assembly into colanic acid, also known as M antigen.
Colanic acid is an extracellular polysaccharide which has been linked to a cluster of 19 genes(wca).
References
Colanic Acid Building Blocks Biosynthesis References
Zielinski NA, Chakrabarty AM, Berry A: Characterization and regulation of the Pseudomonas aeruginosa algC gene encoding phosphomannomutase. J Biol Chem. 1991 May 25;266(15):9754-63.
Pubmed: 1903398
Coyne MJ Jr, Russell KS, Coyle CL, Goldberg JB: The Pseudomonas aeruginosa algC gene encodes phosphoglucomutase, required for the synthesis of a complete lipopolysaccharide core. J Bacteriol. 1994 Jun;176(12):3500-7. doi: 10.1128/jb.176.12.3500-3507.1994.
Pubmed: 7515870
Stover CK, Pham XQ, Erwin AL, Mizoguchi SD, Warrener P, Hickey MJ, Brinkman FS, Hufnagle WO, Kowalik DJ, Lagrou M, Garber RL, Goltry L, Tolentino E, Westbrock-Wadman S, Yuan Y, Brody LL, Coulter SN, Folger KR, Kas A, Larbig K, Lim R, Smith K, Spencer D, Wong GK, Wu Z, Paulsen IT, Reizer J, Saier MH, Hancock RE, Lory S, Olson MV: Complete genome sequence of Pseudomonas aeruginosa PAO1, an opportunistic pathogen. Nature. 2000 Aug 31;406(6799):959-64. doi: 10.1038/35023079.
Pubmed: 10984043
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 SMP0000967
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