Information on EC 2.5.1.95 - xanthan ketal pyruvate transferase

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The expected taxonomic range for this enzyme is: Xanthomonas campestris

EC NUMBER
COMMENTARY
2.5.1.95
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RECOMMENDED NAME
GeneOntology No.
xanthan ketal pyruvate transferase
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REACTION
REACTION DIAGRAM
COMMENTARY
ORGANISM
UNIPROT ACCESSION NO.
LITERATURE
phosphoenolpyruvate + D-Man-beta-(1->4)-D-GlcA-beta-(1->2)-D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol = 4,6-CH3(COO-)C-D-Man-beta-(1->4)-D-GlcA-beta-(1->2)-D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol + phosphate
show the reaction diagram
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PATHWAY
KEGG Link
MetaCyc Link
xanthan biosynthesis
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SYSTEMATIC NAME
IUBMB Comments
phosphoenolpyruvate:D-Man-beta-(1->4)-GlcA-beta-(1->2)-D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol 4,6-O-(1-carboxyethan-1,1-diyl)transferase
Involved in the biosynthesis of the polysaccharide xanthan. 30-40% of the terminal mannose residues of xanthan have a 4,6-O-(1-carboxyethan-1,1-diyl) ketal group. It also acts on the 6-O-acetyl derivative of the inner mannose unit.
SYNONYMS
ORGANISM
UNIPROT ACCESSION NO.
COMMENTARY
LITERATURE
KPT
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-
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ORGANISM
COMMENTARY
LITERATURE
SEQUENCE CODE
SEQUENCE DB
SOURCE
GENERAL INFORMATION
ORGANISM
UNIPROT ACCESSION NO.
COMMENTARY
LITERATURE
malfunction
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the mutant strain is unable to synthesize the pyruvylated intermediate in vitro. Enzyme activity is not essential for polysaccharide production since inactivation of gumL does not affect polymerization. gumL mutants are not affected in growth and produce normal nonpyruvylated polymer levels
physiological function
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the enzyme is involved in the biosynthesis of the polysaccharide xanthan. 30-40% of xanthan terminal mannose residues of xanthan have a 4,6-O-(1-carboxyethan-1,1-diyl) ketal group
SUBSTRATE
PRODUCT                      
REACTION DIAGRAM
ORGANISM
UNIPROT ACCESSION NO.
COMMENTARY
(Substrate)
LITERATURE
(Substrate)
COMMENTARY
(Product)
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
phosphoenolpyruvate + D-Man-beta-(1->4)-D-GlcA-beta-(1->2)-D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol
4,6-CH3(COO-)C-D-Man-beta-(1->4)-D-GlcA-beta-(1->2)-D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol + phosphate
show the reaction diagram
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-, the enzyme is involved in the biosynthesis of the polysaccharide xanthan. 30-40% of xanthan terminal mannose residues of xanthan have a 4,6-O-(1-carboxyethan-1,1-diyl) ketal group
-
-
?
additional information
?
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also acts on the 6-O-acetyl derivative of the inner mannose unit
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NATURAL SUBSTRATES
NATURAL PRODUCTS
REACTION DIAGRAM
ORGANISM
UNIPROT ACCESSION NO.
COMMENTARY
(Substrate)
LITERATURE
(Substrate)
COMMENTARY
(Product)
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
phosphoenolpyruvate + D-Man-beta-(1->4)-D-GlcA-beta-(1->2)-D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol
4,6-CH3(COO-)C-D-Man-beta-(1->4)-D-GlcA-beta-(1->2)-D-Man-alpha-(1->3)-D-Glc-beta-(1->4)-D-Glc-alpha-1-diphospho-ditrans,octacis-undecaprenol + phosphate
show the reaction diagram
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the enzyme is involved in the biosynthesis of the polysaccharide xanthan. 30-40% of xanthan terminal mannose residues of xanthan have a 4,6-O-(1-carboxyethan-1,1-diyl) ketal group
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-
?
Cloned/COMMENTARY
ORGANISM
UNIPROT ACCESSION NO.
LITERATURE
expression in Escherichia coli
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