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- Name help_outline GDP-β-L-colitose Identifier CHEBI:73932 Charge -2 Formula C16H23N5O14P2 InChIKeyhelp_outline GRUFZTGABLSDFG-CQDAXFISSA-L SMILEShelp_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)n2cnc3c2nc(N)[nH]c3=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 InChIKeyhelp_outline XJLXINKUBYWONI-NNYOXOHSSA-K SMILEShelp_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 1,335 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline GDP-4-dehydro-3,6-dideoxy-α-D-mannose Identifier CHEBI:73931 Charge -2 Formula C16H21N5O14P2 InChIKeyhelp_outline ACAXSHCRYZSKNE-FFJBUIDMSA-L SMILEShelp_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)n2cnc3c2nc(N)[nH]c3=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 NADPH Identifier CHEBI:57783 (Beilstein: 10411862) help_outline Charge -4 Formula C21H26N7O17P3 InChIKeyhelp_outline ACFIXJIJDZMPPO-NNYOXOHSSA-J SMILEShelp_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 1,329 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 InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,932 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:36563 | RHEA:36564 | RHEA:36565 | RHEA:36566 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Biosynthesis of colitose: expression, purification, and mechanistic characterization of GDP-4-keto-6-deoxy-D-mannose-3-dehydrase (ColD) and GDP-L-colitose synthase (ColC).
Alam J., Beyer N., Liu H.W.
L-Colitose is a 3,6-dideoxyhexose found in the O-antigen of Gram-negative lipopolysaccharides. To study the biosynthesis of this unusual sugar, we have cloned and sequenced the L-colitose biosynthetic gene cluster from Yersinia pseudotuberculosis VI. The colD and colC genes in this cluster have be ... >> More
L-Colitose is a 3,6-dideoxyhexose found in the O-antigen of Gram-negative lipopolysaccharides. To study the biosynthesis of this unusual sugar, we have cloned and sequenced the L-colitose biosynthetic gene cluster from Yersinia pseudotuberculosis VI. The colD and colC genes in this cluster have been overexpressed and each gene product has been purified and characterized. Our results showed that ColD functions as GDP-4-keto-6-deoxy-D-mannose-3-dehydrase responsible for C-3 deoxygenation of GDP-4-keto-6-deoxy-D-mannose. This enzyme is coenzyme B(6)-dependent and its catalysis is initiated by a transamination step in which pyridoxal 5'-phosphate (PLP) is converted to pyridoxamine 5'-phosphate (PMP) in the presene of L-glutamate. This coenzyme forms a Schiff base with the keto sugar substrate and the resulting adduct undergoes a PMP-mediated beta-dehydration reaction to give a sugar enamine intermediate, which after tautomerization and hydrolysis to release ammonia yields GDP-4-keto-3,6-dideoxy-D-mannose as the product. The combined transamination-deoxygenation activity places ColD in a class by itself. Our studies also established ColC as GDP-L-colitose synthase, which is a bifunctional enzyme catalyzing the C-5 epimerization of GDP-4-keto-3,6-dideoxy-D-mannose and the subsequent C-4 keto reduction of the resulting L-epimer to give GDP-L-colitose. Reported herein are the detailed accounts of the overexpression, purification, and characterization of ColD and ColC. Our studies show that their modes of action in the biosynthesis of GDP-L-colitose represent a new deoxygenation paradigm in deoxysugar biosynthesis. << Less
Biochemistry 43:16450-16460(2004) [PubMed] [EuropePMC]
This publication is cited by 6 other entries.