Rhea - reaction knowledgebase

Enzymes

UniProtKB ^help_outline	3 proteins
Enzyme class ^help_outline	EC 1.1.1.341 CDP-abequose synthase

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Name ^help_outline CDP-α-D-abequose Identifier CHEBI:70784 Charge -2 Formula C15H23N3O14P2 InChIKey^help_outline JHEDABDMLBOYRG-YGBYUOMUSA-L SMILES^help_outline C[C@H]1O[C@H](OP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](O)[C@@H]2O)n2ccc(N)nc2=O)[C@H](O)C[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name ^help_outline NADP⁺ Identifier CHEBI:58349 Charge -3 Formula C21H25N7O17P3 InChIKey^help_outline XJLXINKUBYWONI-NNYOXOHSSA-K SMILES^help_outline NC(=O)c1ccc[n+](c1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,285 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name ^help_outline CDP-4-dehydro-3,6-dideoxy-α-D-glucose Identifier CHEBI:70783 Charge -2 Formula C15H21N3O14P2 InChIKey^help_outline DATWFRMXXZBEPM-SNAICPSHSA-L SMILES^help_outline C[C@H]1O[C@H](OP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](O)[C@@H]2O)n2ccc(N)nc2=O)[C@H](O)CC1=O 2D coordinates Mol file for the small molecule Search links Involved in 4 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name ^help_outline H⁺ Identifier CHEBI:15378 Charge 1 Formula H InChIKey^help_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILES^help_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,431 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Name ^help_outline NADPH Identifier CHEBI:57783 (Beilstein: 10411862) ^help_outline Charge -4 Formula C21H26N7O17P3 InChIKey^help_outline ACFIXJIJDZMPPO-NNYOXOHSSA-J SMILES^help_outline NC(=O)C1=CN(C=CC1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](OP([O-])([O-])=O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,279 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule

Cross-references

	RHEA:34563	RHEA:34564	RHEA:34565	RHEA:34566
Reaction direction	undefined	left-to-right	right-to-left	bidirectional
UniProtKB ^help_outline	3 proteins
EC numbers ^help_outline	1.1.1.341
KEGG ^help_outline				R08711
MetaCyc ^help_outline				RXN-9158

Publications

Molecular analysis of the 3,6-dideoxyhexose pathway genes of Yersinia pseudotuberculosis serogroup IIA.

Kessler A.C., Haase A., Reeves P.R.

Salmonella enterica and Yersinia pseudotuberculosis are the only examples in nature known to use a variety of 3,6-dideoxyhexose derivatives as O antigen constituents. To allow a comparison of the responsible biosynthetic genes of the two organisms, we have sequenced a section of the Y. pseudotuber ... >> More

Salmonella enterica and Yersinia pseudotuberculosis are the only examples in nature known to use a variety of 3,6-dideoxyhexose derivatives as O antigen constituents. To allow a comparison of the responsible biosynthetic genes of the two organisms, we have sequenced a section of the Y. pseudotuberculosis serogroup IIA rfb region that contained the genes for the abequose biosynthetic pathway. Comparison of the identified genes with the rfb region of S. enterica LT2 showed that the two dideoxyhexose pathway gene clusters are related. The arrangement of the genes was largely conserved, and the G + C compositions of the two DNA regions were strikingly similar; however, the degree of conservation of nucleotide and protein sequences suggested that the two gene clusters have been evolving independently for considerable time. Hybridization experiments showed that the dideoxyhexose pathway genes are widespread throughout the various serogroups of Y. pseudotuberculosis. << Less

J. Bacteriol. 175:1412-1422(1993) [PubMed] [EuropePMC]
Molecular cloning and genetic characterization of the rfb region from Yersinia pseudotuberculosis serogroup IIA, which determines the formation of the 3,6-dideoxyhexose abequose.

Kessler A.C., Brown P.K., Romana L.K., Reeves P.R.

The rfb region of Yersinia pseudotuberculosis serogroup IIA has been cloned and expression of O antigen in Escherichia coli K12 was demonstrated. Transposon mutagenesis analysis confined the DNA region required for O antigen expression to a 19.3 kb fragment, and the O antigen expressed was visuali ... >> More

The rfb region of Yersinia pseudotuberculosis serogroup IIA has been cloned and expression of O antigen in Escherichia coli K12 was demonstrated. Transposon mutagenesis analysis confined the DNA region required for O antigen expression to a 19.3 kb fragment, and the O antigen expressed was visualized by SDS-PAGE and silver staining. Southern hybridization analysis demonstrated significant levels of similarity between the Yersinia rfb region and the 3,6-dideoxyhexose pathway genes rfbF and rfbG, previously isolated from Salmonella enterica LT2, but no similarity to the abequose synthase gene rfbJ of the same strain or the paratose synthase gene rfbS isolated from S. enterica Ty2. The evolutionary relationship between the abequose biosynthetic genes of the two species of Salmonella and Yersinia is discussed. << Less

J. Gen. Microbiol. 137:2689-2695(1991) [PubMed] [EuropePMC]
Identification and sequence of the gene for abequose synthase, which confers antigenic specificity on group B salmonellae: homology with galactose epimerase.

Wyk P., Reeves P.R.

The O antigen of Salmonella group B strains contains the sugar abequose, whereas those from group A and D strains contain paratose or tyvelose in its place. This is the essential difference between these Salmonella groups. Only the final step in the biosynthesis of abequose differs from that of pa ... >> More

The O antigen of Salmonella group B strains contains the sugar abequose, whereas those from group A and D strains contain paratose or tyvelose in its place. This is the essential difference between these Salmonella groups. Only the final step in the biosynthesis of abequose differs from that of paratose, and the abequose confers on group B strains their specific O4 antigen. The gene, rfbJ, encoding the enzyme abequose synthase for this last specific step has been cloned, identified, and sequenced and has been shown to function in group A and D strains to make them O4+. This one gene thus differentiates group B from group A or group D salmonellae. The enzyme abequose synthase appears to be related to galactose epimerase, and the significance of this is discussed. The rfbJ gene and adjacent DNA is of much lower G+C content than is usual for salmonellae, indicating that the region did not originate in a salmonella but was transferred from outside. << Less

J. Bacteriol. 171:5687-5693(1989) [PubMed] [EuropePMC]
Studies of the biosynthesis of 3,6-dideoxyhexoses: molecular cloning and characterization of the asc (ascarylose) region from Yersinia pseudotuberculosis serogroup VA.

Thorson J.S., Lo S.F., Ploux O., He X., Liu H.-W.

The 3,6-dideoxyhexoses are found in the lipopolysaccharides of gram-negative bacteria, where they have been shown to be the dominant antigenic determinants. Of the five 3,6-dideoxyhexoses known to occur naturally, four have been found in various strains of Salmonella enterica (abequose, tyvelose, ... >> More

The 3,6-dideoxyhexoses are found in the lipopolysaccharides of gram-negative bacteria, where they have been shown to be the dominant antigenic determinants. Of the five 3,6-dideoxyhexoses known to occur naturally, four have been found in various strains of Salmonella enterica (abequose, tyvelose, paratose, and colitose) and all five, including ascarylose, are present among the serotypes of Yersinia pseudotuberculosis. Although there exists one report of the cloning of the rfb region harboring the abequose biosynthetic genes from Y. pseudotuberculosis serogroup HA, the detailed genetic principles underlying a 3,6-dideoxyhexose polymorphism in Y. pseudotuberculosis have not been addressed. To extend the available information on the genes responsible for 3,6-dideoxyhexose formation in Yersinia spp. and facilitate a comparison with the established rfb (O antigen) cluster of Salmonella spp., we report the production of three overlapping clones containing the entire gene cluster required for CDP-ascarylose biosynthesis. On the basis of a detailed sequence analysis, the implications regarding 3,6-dideoxyhexose polymorphism among Salmonella and Yersinia spp. are discussed. In addition, the functional cloning of this region has allowed the expression of Ep (alpha-D-glucose cytidylyltransferase), Eod (CDP-D-glucose 4,6-dehydratase), E1 (CDP-6-deoxy-L-threo-D-glycero-4-hexulose-3-dehydrase), E3 (CDP-6-deoxy-delta 3,4-glucoseen reductase), Eep (CDP-3,6-dideoxy-D-glycero-D-glycero-4-hexulose-5-epimerase), and Ered (CDP-3,6-dideoxy-L-glycero-D-glycero-4-hexulose-4-reductase), facilitating future mechanistic studies of this intriguing biosynthetic pathway. << Less

J. Bacteriol. 176:5483-5493(1994) [PubMed] [EuropePMC]

RHEA:34563 CDP-alpha-D-abequose + NADP(+) = CDP-4-dehydro-3,6-dideoxy-alpha-D-glucose + H(+) + NADPH

Enzymes

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Cross-references

Publications

Molecular analysis of the 3,6-dideoxyhexose pathway genes of Yersinia pseudotuberculosis serogroup IIA.

Molecular cloning and genetic characterization of the rfb region from Yersinia pseudotuberculosis serogroup IIA, which determines the formation of the 3,6-dideoxyhexose abequose.

Identification and sequence of the gene for abequose synthase, which confers antigenic specificity on group B salmonellae: homology with galactose epimerase.

Studies of the biosynthesis of 3,6-dideoxyhexoses: molecular cloning and characterization of the asc (ascarylose) region from Yersinia pseudotuberculosis serogroup VA.