Escherichia coli K-12 substr. MG1655 Pathway: L-ascorbate degradation I (bacterial, anaerobic)
Inferred from experiment

Pathway diagram: L-ascorbate degradation I (bacterial, anaerobic)

If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.

Locations of Mapped Genes:

Schematic showing all replicons, marked with selected genes

Genetic Regulation Schematic

Genetic regulation schematic for L-ascorbate degradation I (bacterial, anaerobic)

Synonyms: ascorbic acid degradation I

Superclasses: Degradation/Utilization/AssimilationCarboxylates DegradationL-Ascorbate Degradation

E. coli is able to utilize L-ascorbate (vitamin C) as the sole source of carbon under anaerobic conditions [Yew02].

L-ascorbate is imported and converted to L-ascorbate-6-phosphate by the L-ascorbate PTS transporter [Zhang03d]. L-ascorbate-6-phosphate is subsequently metabolized by UlaG, UlaD, UlaE and UlaF to D-xylulose-5-phosphate, which can enter central metabolism via the non-oxidative branch of the pentose phosphate pathway [Yew02].

Expression of the ula regulon is regulated by the L-ascorbate 6-phosphate-binding repressor UlaR and by cAMP-CRP [Campos04, Garces08].

Variants: L-ascorbate degradation II (bacterial, aerobic)

Created 18-Dec-2002 by Arnaud M, SRI International
Last-Curated 10-Nov-2008 by Keseler I, SRI International


Campos04: Campos E, Baldoma L, Aguilar J, Badia J (2004). "Regulation of expression of the divergent ulaG and ulaABCDEF operons involved in LaAscorbate dissimilation in Escherichia coli." J Bacteriol 186(6);1720-8. PMID: 14996803

Garces08: Garces F, Fernandez FJ, Gomez AM, Perez-Luque R, Campos E, Prohens R, Aguilar J, Baldoma L, Coll M, Badia J, Vega MC (2008). "Quaternary structural transitions in the DeoR-type repressor UlaR control transcriptional readout from the L-ascorbate utilization regulon in Escherichia coli." Biochemistry 47(44);11424-33. PMID: 18844374

Yew02: Yew WS, Gerlt JA (2002). "Utilization of L-ascorbate by Escherichia coli K-12: assignments of functions to products of the yjf-sga and yia-sgb operons." J Bacteriol 2002;184(1);302-6. PMID: 11741871

Zhang03d: Zhang Z, Aboulwafa M, Smith MH, Saier MH (2003). "The ascorbate transporter of Escherichia coli." J Bacteriol 185(7);2243-50. PMID: 12644495

Other References Related to Enzymes, Genes, Subpathways, and Substrates of this Pathway

BRENDA14: BRENDA team (2014). Imported from BRENDA version existing on Aug 2014.

Campos02: Campos E, Aguilar J, Baldoma L, Badia J (2002). "The gene yjfQ encodes the repressor of the yjfR-X regulon (ula), which is involved in L-ascorbate metabolism in Escherichia coli." J Bacteriol 184(21);6065-8. PMID: 12374842

DiazMejia09: Diaz-Mejia JJ, Babu M, Emili A (2009). "Computational and experimental approaches to chart the Escherichia coli cell-envelope-associated proteome and interactome." FEMS Microbiol Rev 33(1);66-97. PMID: 19054114

Fernandez11: Fernandez FJ, Garces F, Lopez-Estepa M, Aguilar J, Baldoma L, Coll M, Badia J, Vega MC (2011). "The UlaG protein family defines novel structural and functional motifs grafted on an ancient RNase fold." BMC Evol Biol 11;273. PMID: 21943130

Garces08a: Garces F, Fernandez FJ, Perez-Luque R, Aguilar J, Baldoma L, Coll M, Badia J, Vega MC (2008). "Overproduction, crystallization and preliminary X-ray analysis of the putative L-ascorbate-6-phosphate lactonase UlaG from Escherichia coli." Acta Crystallogr Sect F Struct Biol Cryst Commun 64(Pt 1);36-8. PMID: 18097099

Garces10: Garces F, Fernandez FJ, Montella C, Penya-Soler E, Prohens R, Aguilar J, Baldoma L, Coll M, Badia J, Vega MC (2010). "Molecular architecture of the Mn2+-dependent lactonase UlaG reveals an RNase-like metallo-beta-lactamase fold and a novel quaternary structure." J Mol Biol 398(5);715-29. PMID: 20359483

GOA01: GOA, MGI (2001). "Gene Ontology annotation based on Enzyme Commission mapping." Genomics 74;121-128.

GOA01a: GOA, DDB, FB, MGI, ZFIN (2001). "Gene Ontology annotation through association of InterPro records with GO terms."

GOA06: GOA, SIB (2006). "Electronic Gene Ontology annotations created by transferring manual GO annotations between orthologous microbial proteins."

Ibanez00: Ibanez E, Gimenez R, Pedraza T, Baldoma L, Aguilar J, Badia J (2000). "Role of the yiaR and yiaS genes of Escherichia coli in metabolism of endogenously formed L-xylulose." J Bacteriol 2000;182(16);4625-7. PMID: 10913097

Johnson98: Johnson AE, Tanner ME (1998). "Epimerization via carbon-carbon bond cleavage. L-ribulose-5-phosphate 4-epimerase as a masked class II aldolase." Biochemistry 37(16);5746-54. PMID: 9548961

Kuznetsova05: Kuznetsova E, Proudfoot M, Sanders SA, Reinking J, Savchenko A, Arrowsmith CH, Edwards AM, Yakunin AF (2005). "Enzyme genomics: Application of general enzymatic screens to discover new enzymes." FEMS Microbiol Rev 29(2);263-79. PMID: 15808744

Lee00: Lee LV, Vu MV, Cleland WW (2000). "13C and deuterium isotope effects suggest an aldol cleavage mechanism for L-ribulose-5-phosphate 4-epimerase." Biochemistry 39(16);4808-20. PMID: 10769138

Lee00a: Lee LV, Poyner RR, Vu MV, Cleland WW (2000). "Role of metal ions in the reaction catalyzed by L-ribulose-5-phosphate 4-epimerase." Biochemistry 39(16);4821-30. PMID: 10769139

Lee68: Lee N, Patrick JW, Masson M (1968). "Crystalline L-ribulose 5-phosphate 4-epimerase from Escherichia coli." J Biol Chem 1968;243(18);4700-5. PMID: 4879898

Samuel01: Samuel J, Luo Y, Morgan PM, Strynadka NC, Tanner ME (2001). "Catalysis and binding in L-ribulose-5-phosphate 4-epimerase: a comparison with L-fuculose-1-phosphate aldolase." Biochemistry 40(49);14772-80. PMID: 11732896

Shi08: Shi R, Pineda M, Ajamian E, Cui Q, Matte A, Cygler M (2008). "Structure of L-xylulose-5-Phosphate 3-epimerase (UlaE) from the anaerobic L-ascorbate utilization pathway of Escherichia coli: identification of a novel phosphate binding motif within a TIM barrel fold." J Bacteriol 190(24);8137-44. PMID: 18849419

UniProtGOA11: UniProt-GOA (2011). "Gene Ontology annotation based on the manual assignment of UniProtKB Subcellular Location terms in UniProtKB/Swiss-Prot entries."

UniProtGOA11a: UniProt-GOA (2011). "Gene Ontology annotation based on manual assignment of UniProtKB keywords in UniProtKB/Swiss-Prot entries."

UniProtGOA12: UniProt-GOA (2012). "Gene Ontology annotation based on UniPathway vocabulary mapping."

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Please cite the following article in publications resulting from the use of EcoCyc: Nucleic Acids Research 41:D605-12 2013
Page generated by Pathway Tools version 19.5 (software by SRI International) on Wed Jan 2, 2002, biocyc12.