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ISOLATION AND CHARACTERIZATION OF SIX cDNAs INVOLVED IN CARBON METABOLISM IN LAMINARIA DIGITATA (PHAEOPHYCEAE)
Author(s) -
Moulin Pascale,
Crépineau Florent,
Kloareg Bernard,
Boyen Catherine
Publication year - 1999
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1046/j.1529-8817.1999.3561237.x
Subject(s) - biology , laminaria digitata , complementary dna , biochemistry , dehydrogenase , southern blot , microbiology and biotechnology , gene , enzyme , algae , botany
An expressed sequence tag (EST) approach was used to retrieve cDNA clones involved in carbon metabolism in Laminaria digitata Lamouroux. Six partial open reading frames were identified, respectively encoding an α‐type carbonic anhydrase (CA), glucose‐6‐phosphate dehydrogenase (G6PDH), 6‐phosphogluconate dehydrogenase (6PGDH), phosphoglycerate kinase (PGK), glycolate oxidase (GLO), and GDP‐4‐keto‐6‐d‐mannose‐3,5‐epimerase‐4‐reductase, also known as fucose synthase (FS). These enzymes were further characterized through Southern blot analyses, amino acid sequence comparisons, and patterns of expression. In contrast to the other genes, which are expressed in both the gametophytic and sporophytic generations of L. digitata, the α‐type carbonic anhydrase messenger RNA was shown by RT‐PCR and northern blot analyses to be present in the gametophytes only. The evolutionary relationships of these genes and their interest as molecular tools for investigating carbon fluxes in brown algae are discussed.