EC - Rhizobium leguminosarum exopolysaccharide glucosyl ketal-pyruvate-transferase

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IntEnz Enzyme Nomenclature


Accepted name:
Rhizobium leguminosarum exopolysaccharide glucosyl ketal-pyruvate-transferase
Other names:
phosphoenolpyruvate:[D-GlcA-β-(1→4)-2-O-Ac-D-GlcA-β-(1→4)-D-Glc-β-(1→4)-[3-O-CH3-CH2CH(OH)C(O)-D-Gal-β-(1→4)-D-Glc-β-(1→4)-D-Glc-β-(1→4)-D-Glc-β-(1→6)]-2(or3)-O-Ac-D-Glc-α-(1→6)]n 4,6-O-(1-carboxyethan-1,1-diyl)transferase
Systematic name:
phosphoenolpyruvate:[β-D-GlcA-β-(1→4)-2-O-Ac-β-D-GlcA-(1→4)-β-D-Glc-(1→4)-[3-O-(CH3-CH2CH(OH)C(O))-4,6-CH3(COO)C-β-D-Gal-(1→4)-β-D-Glc-(1→4)-β-D-Glc-(1→4)-β-D-Glc-(1→6)]-2(or3)-O-Ac-α-D-Glc-(1→6)]n 4,6-O-(1-carboxyethan-1,1-diyl)transferase



The enzyme is responsible for pyruvylation of subterminal glucose in the acidic octasaccharide repeating unit of the exopolysaccharide of Rhizobium leguminosarum (bv. viciae strain VF39) which is necessary to establish nitrogen-fixing symbiosis with Pisum sativum, Vicia faba, and Vicia sativa.

Links to other databases

Enzymes and pathways: NC-IUBMB , BRENDA , ExplorEnz , ENZYME@ExPASy , KEGG , MetaCyc , UniPathway
Structural data: CSA , EC2PDB


  1. Ivashina, T. V., Fedorova, E. E., Ashina, N. P., Kalinchuk, N. A., Druzhinina, T. N., Shashkov, A. S., Shibaev, V. N., Ksenzenko, V. N.
    Mutation in the pssM gene encoding ketal pyruvate transferase leads to disruption of Rhizobium leguminosarum bv. viciae-Pisum sativum symbiosis.
    J. Appl. Microbiol. 109 : 731-742 (2010). [PMID: 20233262]

[EC created 2012, modified 2018]