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Literature summary extracted from

  • Alegre, M.L.; Steelheart, C.; Baldet, P.; Rothan, C.; Just, D.; Okabe, Y.; Ezura, H.; Smirnoff, N.; Gergoff Grozeff, G.E.; Bartoli, C.G.
    Deficiency of GDP-L-galactose phosphorylase, an enzyme required for ascorbic acid synthesis, reduces tomato fruit yield (2020), Planta, 251, 54 .
    View publication on PubMed

Protein Variants

EC Number Protein Variants Comment Organism
2.7.7.69 additional information analysis of the phenotype of two SlGGP1-deficient EMS Micro-Tom mutants. Fruits of the ggp1 plants produce more ethylene and show higher firmness and soluble solids content than the wild-type after the breaker stage. Leaf CO2 uptake decreases about 50% in both ggp1 mutants at saturating light conditions; however, O2 production in an enriched CO2 atmosphere is only 19% higher in wild-type leaves. Leaf conductance that is largely reduced in both mutants may be the main limitation for photosynthesis. Ethylene production is higher in the mutant lines than wild-type fruit at the breaker and red stages Solanum lycopersicum

Natural Substrates/ Products (Substrates)

EC Number Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
2.7.7.69 GDP-beta-L-galactose + alpha-D-mannose 1-phosphate Solanum lycopersicum
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 beta-L-galactose 1-phosphate + GDP-alpha-D-mannose
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 ?

Organism

EC Number Organism UniProt Comment Textmining
2.7.7.69 Solanum lycopersicum H9D2D6 cv. Micro-Tom, lines GGP-5261 and GGP-49C12
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Source Tissue

EC Number Source Tissue Comment Organism Textmining
2.7.7.69 flower
-
 Solanum lycopersicum
-
2.7.7.69 fruit
-
 Solanum lycopersicum
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2.7.7.69 leaf
-
 Solanum lycopersicum
-
2.7.7.69 root
-
 Solanum lycopersicum
-

Substrates and Products (Substrate)

EC Number Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
2.7.7.69 GDP-beta-L-galactose + alpha-D-mannose 1-phosphate
-
 Solanum lycopersicum beta-L-galactose 1-phosphate + GDP-alpha-D-mannose
-
 ?

Synonyms

EC Number Synonyms Comment Organism
2.7.7.69 GGP
-
 Solanum lycopersicum
2.7.7.69 SlGGP
-
 Solanum lycopersicum
2.7.7.69 SlGGP1
-
 Solanum lycopersicum

General Information

EC Number General Information Comment Organism
2.7.7.69 malfunction deficiency of GDP-L-galactose phosphorylase reduces tomato fruit yield, the whole fruit biomass accumulation is reduced in mutant lines. The SlGGP1 mutants display decreased concentrations of ascorbate in roots, leaves, flowers, and fruit. The initiation of anthesis is delayed in ggp1 plants but the number of flowers is similar to wild type. The number of fruits is reduced in ggp1 mutants with an increased individual weight. Ethylene production is higher in the mutant lines than wild-type fruit at the breaker and red stages. Effects of source-sink manipulation on fruit yield characteristics, overview Solanum lycopersicum
2.7.7.69 metabolism GDP-L-galactose phosphorylase (GGP) catalyzes the first step committed to ascorbic acid synthesis. The ascorbate biosynthetic pathway critically participates in tomato development and fruit production Solanum lycopersicum
2.7.7.69 physiological function GDP-L-galactose phosphorylase is required for ascorbic acid synthesis. Participation of GDP-L-galactose phosphorylase and ascorbate in tomato fruit production and quality Solanum lycopersicum