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Literature summary for 2.5.1.62 extracted from

  • Lin, Y.P.; Lee, T.Y.; Tanaka, A.; Charng, Y.Y.
    Analysis of an Arabidopsis heat-sensitive mutant reveals that chlorophyll synthase is involved in reutilization of chlorophyllide during chlorophyll turnover (2014), Plant J., 80, 14-26.
    View publication on PubMed
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Localization

Localization Comment Organism GeneOntology No. Textmining
chloroplast
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 Arabidopsis thaliana 9507
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Organism

Organism UniProt Comment Textmining
Arabidopsis thaliana Q38833 chloroplast isozyme; gene chlG
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General Information

General Information Comment Organism
malfunction mutant dlt4-1 is pale green and heat sensitive due to the reduced Chl content. Besides Chl synthase, Lhcb1, a light-harvesting Chl a/b-binding protein, is reduced to about 60% of the wild-type level in chlg-1. The chlG missense mutation is responsible for a light-dependent, heat-induced cotyledon bleaching phenotype. Following heat treatment, mutant chlg-1 but not wild-type seedlings accumulate a substantial level of chlorophyllide a, which results in a surge of phototoxic singlet oxygen. The mutation destabilized the chlorophyll synthase proteins and causes a conditional blockage of esterification of chlorophyllide a after heat stress. Accumulation of chlorophyllide a after heat treatment occurs during recovery in the dark in the light-grown but not the etiolated seedlings, suggesting that the accumulated chlorophyllides were not derived from de novo biosynthesis but from de-esterification of the existing chlorophylls. The triple mutant harboring the ChlG mutant allele and null mutations of chlorophyllase 1 (CLH1) and CLH2 indicates that the known chlorophyllases are not responsible for the accumulation of chlorophyllide a in chlg-1 Arabidopsis thaliana
physiological function chlorophyll synthase is involved in reutilization of chlorophyllide during chlorophyll turnover Arabidopsis thaliana