This view shows enzymes only for those organisms listed below, in the list of taxa known to possess the pathway. If an enzyme name is shown in bold, there is experimental evidence for this enzymatic activity.
Synonyms: CMP-3-deoxy-D-manno-octulosonate biosynthesis
|Superclasses:||Biosynthesis → Carbohydrates Biosynthesis → Polysaccharides Biosynthesis → CMP-KDO Biosynthesis|
|Biosynthesis → Carbohydrates Biosynthesis → Sugars Biosynthesis → Sugar Nucleotides Biosynthesis → CMP-sugar Biosynthesis|
The acid sugar 3-deoxy-D-manno-octulosonate (KDO), in addition to being an important component of the lipopolysaccharides of Gram-negative bacteria, is also a component of the rhamnogalacturonan II (RGII) pectin fraction of the primary cell walls of most higher plants, including dicots, monocots and gymnosperms [Albersheim94, Edashige98, York85, Shin97]. To date, the specific contribution of KDO to RGII function, as well as the pathway leading to the synthesis, activation and incorporation of KDO into this polysaccharide remain largely unknown. In order to be incorporated into cell wall polymers, KDO requires to be activated; free KDO cannot be directly incorporated. This activation occurs through the unusual coupling of KDO to the monophosphonucleotide CMP, rather than to the more common diphosphonucleotides [Royo00a].
The first two steps of this pathway deal with the formation of KDO from D-arabinose 5-phosphate. The first reaction is catalyzed by a family of genes called KDOPS (3-deoxy-D-manno-octulosonate-8-phosphate synthase). The bacterial KDOPSs are grouped in two classes: Class I and Class II. It has been proposed that the plant KDOPSs belong to a third class (stable against thermal denaturation, dimeric and non-metallo-enzymes) [Wu04a]. No plant enzymes have yet been shown to catalyze reaction EC 18.104.22.168 [Wu04a]. The last step of the pathway corresponds to the activation step of KDO. This step is catalyzed by a 3-deoxy-manno-octulosonate cytidylyltransferase called CMP-3-deoxy-D-manno-2-octulosonate synthetase (CKS). To date the only characterized representative of plant CKSs is the maize ZmCKS [Royo00].
Note on this pathway variant:
This pathway is almost identical to its variant CMP-KDO biosynthesis I. The difference lies in the first step. Indeed, in plants (represented in this pathway), the origin of D-arabinose 5-phosphate is unknown and it was therefore judged inappropriate to include the isomerisation step of D-ribulose 5-phosphate into D-arabinose 5-phosphate in this pathway. This conversion, however, has not been disproved; but remains to be ascertained in plants.
Variants: CMP-KDO biosynthesis I
Unification Links: AraCyc:PWY-5111
Albersheim94: Albersheim P, An J, Freshour G, Fuller MS, Guillen R, Ham KS, Hahn MG, Huang J, O'Neill M, Whitcombe A (1994). "Structure and function studies of plant cell wall polysaccharides." Biochem Soc Trans 22(2);374-8. PMID: 7958328
Delmas03: Delmas F, Petit J, Joubes J, Seveno M, Paccalet T, Hernould M, Lerouge P, Mouras A, Chevalier C (2003). "The gene expression and enzyme activity of plant 3-deoxy-D-manno-2-octulosonic acid-8-phosphate synthase are preferentially associated with cell division in a cell cycle-dependent manner." Plant Physiol 133(1);348-60. PMID: 12970500
Matsuura03: Matsuura K, Miyagawa I, Kobayashi M, Ohta D, Matoh T (2003). "Arabidopsis 3-deoxy-D-manno-oct-2-ulosonate-8-phosphate synthase: cDNA cloning and expression analyses." J Exp Bot 54(388);1785-7. PMID: 12754267
Royo00: Royo J, Gomez E, Hueros G (2000). "A maize homologue of the bacterial CMP-3-deoxy-D-manno-2-octulosonate (KDO) synthetases. Similar pathways operate in plants and bacteria for the activation of KDO prior to its incorporation into outer cellular envelopes." J Biol Chem 275(32);24993-9. PMID: 10829033
Shin97: Shin, K.-S., Kiyohara, H., Matsumoto, T., Yamada, H. (1997). "Rhamnogalacturonan II from the leaves of Panax ginseng C.A. Meyer as a macrophage Fc receptor expression-enhancing polysaccharide." Carbohydr. Res. 300:239-249.
Wu04a: Wu J, Patel MA, Sundaram AK, Woodard RW (2004). "Functional and biochemical characterization of a recombinant Arabidopsis thaliana 3-deoxy-D-manno-octulosonate 8-phosphate synthase." Biochem J 381(Pt 1);185-93. PMID: 15070398
York85: York, W.S., Davill, A.G., McNeil, M., Albersheim, P. (1985). "3-deoxy-D-manno-2-octulosonic acid (KDO) is a component of rhamnogalacturonan II, a pectic polysaccharide in the primary cell walls of plants." Carbohydr. Res. 139:109-126.
Baasov93: Baasov T, Sheffer-Dee-Noor S, Kohen A, Jakob A, Belakhov V (1993). "Catalytic mechanism of 3-deoxy-D-manno-2-octulosonate-8-phosphate synthase. The use of synthetic analogues to probe the structure of the putative reaction intermediate." Eur J Biochem 217(3);991-9. PMID: 8223657
Dotson95: Dotson GD, Dua RK, Clemens JC, Wooten EW, Woodard RW (1995). "Overproduction and one-step purification of Escherichia coli 3-deoxy-D-manno-octulosonic acid 8-phosphate synthase and oxygen transfer studies during catalysis using isotopic-shifted heteronuclear NMR." J Biol Chem 270(23);13698-705. PMID: 7775423
Furdui05: Furdui CM, Sau AK, Yaniv O, Belakhov V, Woodard RW, Baasov T, Anderson KS (2005). "The use of (E)- and (Z)-phosphoenol-3-fluoropyruvate as mechanistic probes reveals significant differences between the active sites of KDO8P and DAHP synthases." Biochemistry 44(19);7326-35. PMID: 15882071
Ghalambor66: Ghalambor MA, Heath EC (1966). "The biosynthesis of cell wall lipopolysaccharide in Escherichia coli. IV. Purification and properties of cytidine monophosphate 3-deoxy-d-manno-octulosonate synthetase." J Biol Chem 1966;241(13);3216-21. PMID: 5330266
Goldman85: Goldman RC, Kohlbrenner WE (1985). "Molecular cloning of the structural gene coding for CTP:CMP-3-deoxy-manno-octulosonate cytidylyltransferase from Escherichia coli K-12." J Bacteriol 163(1);256-61. PMID: 2989246
Hedstrom88: Hedstrom L, Abeles R (1988). "3-Deoxy-D-manno-octulosonate-8-phosphate synthase catalyzes the C-O bond cleavage of phosphoenolpyruvate." Biochem Biophys Res Commun 157(2);816-20. PMID: 2904815
Heyes09: Heyes DJ, Levy C, Lafite P, Roberts IS, Goldrick M, Stachulski AV, Rossington SB, Stanford D, Rigby SE, Scrutton NS, Leys D (2009). "Structure-based mechanism of CMP-2-keto-3-deoxymanno-octulonic acid synthetase: convergent evolution of a sugar-activating enzyme with DNA/RNA polymerases." J Biol Chem 284(51);35514-23. PMID: 19815542
Howe03: Howe DL, Sundaram AK, Wu J, Gatti DL, Woodard RW (2003). "Mechanistic insight into 3-deoxy-D-manno-octulosonate-8-phosphate synthase and 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase utilizing phosphorylated monosaccharide analogues." Biochemistry 42(17);4843-54. PMID: 12718525
Kohlbrenner85: Kohlbrenner WE, Fesik SW (1985). "Determination of the anomeric specificity of the Escherichia coli CTP:CMP-3-deoxy-D-manno-octulosonate cytidylyltransferase by 13C NMR spectroscopy." J Biol Chem 260(27);14695-700. PMID: 2997221
Kohlbrenner87: Kohlbrenner WE, Nuss MM, Fesik SW (1987). "31P and 13C NMR studies of oxygen transfer during catalysis by 3-deoxy-D-manno-octulosonate cytidylyltransferase from Escherichia coli." J Biol Chem 262(10);4534-7. PMID: 3031027
Krosky02: Krosky DJ, Alm R, Berg M, Carmel G, Tummino PJ, Xu B, Yang W (2002). "Helicobacter pylori 3-deoxy-D-manno-octulosonate-8-phosphate (KDO-8-P) synthase is a zinc-metalloenzyme." Biochim Biophys Acta 1594(2);297-306. PMID: 11904225
Li05: Li Z, Sau AK, Furdui CM, Anderson KS (2005). "Probing the role of tightly bound phosphoenolpyruvate in Escherichia coli 3-deoxy-d-manno-octulosonate 8-phosphate synthase catalysis using quantitative time-resolved electrospray ionization mass spectrometry in the millisecond time range." Anal Biochem 343(1);35-47. PMID: 15979047
Liang98: Liang PH, Lewis J, Anderson KS, Kohen A, D'Souza FW, Benenson Y, Baasov T (1998). "Catalytic mechanism of Kdo8P synthase: transient kinetic studies and evaluation of a putative reaction intermediate." Biochemistry 37(46);16390-9. PMID: 9819231
Ray80a: Ray PH, Benedict CD (1980). "Purification and characterization of specific 3-deoxy-D-manno-octulosonate 8-phosphate phosphatase from Escherichia coli B." J Bacteriol 1980;142(1);60-8. PMID: 6246070
Ray81: Ray PH, Benedict CD, Grasmuk H (1981). "Purification and characterization of cytidine 5'-triphosphate:cytidine 5'-monophosphate-3-deoxy-D-manno-octulosonate cytidylyltransferase." J Bacteriol 1981;145(3);1273-80. PMID: 6259128
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