l-Ascorbic-acid biosynthesis in the euryhaline diatom Cyclotella cryptica |
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| Authors: | Michael Grün Frank A. Loewus |
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| Affiliation: | (1) Institute of Biological Chemistry, Washington State University, 99164-6340 Pullman, WA, USA;(2) Program in Biochemistry/Biophysics, Washington State University, 99164-6340 Pullman, WA, USA;(3) Present address: Sachsenstrasse 7, D-8400 Regensburg, FRG |
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| Abstract: | l-Ascorbic acid (AA) production in cells of Cyclotella cryptica Reimann, Lewin, Guillard (Bacillariophyceae) is enhanced when darkadapted cells are exposed to light.Heterotrophically grown cells incubated with d-[6-3H,6-14C]glucose and d-[1-3H,6-14C]glucose (2 h in dark followed by 15 h light) produced labeled AA with significantly different ratios of 3H and 14C. Comparisons of labeling patterns in AA and chitin-derived d-glucosamine support a path of conversion in Cyclotella from d-glucose to AA that  inverts the carbon chain of the sugar. This process resembles similar conversions found in AA-synthesizing animals and species from two other algal classes.Abbreviations AA l-Ascorbic acid - glc d-glucose - glcN d-glucosamine |
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| Keywords: | Ascorbic acid biosynthesis Bacillariophyta Cyclotella Glucosamine |
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