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  • Title: Selenium Metabolism in Neptunia amplexicaulis.
    Author: Burnell JN.
    Journal: Plant Physiol; 1981 Feb; 67(2):316-24. PubMed ID: 16661667.
    Abstract:
    ATP sulfurylase (EC 2.7.7.4), cysteinyl-tRNA synthetase (EC 6.1.1.16), and methionyl-tRNA synthetase (EC 6.1.1.10) from Neptunia amplexicaulis have been purified approximately 162-, 140- and 185-fold, respectively. Purified ATP sulfurylase in the presence of purified inorganic pyrophosphatase catalyzed the incorporation of sulfate into adenosine 5'-phosphosulfate; evidence of an analogous reaction with selenate is presented. Crude extracts catalyzed both the sulfate- and the adenosine 5'-phosphosulfate-dependent NADH oxidation in the adenosine 5'-phosphosulfate kinase assay of Burnell and Whatley (1977 Biochim Biophys Acta 481: 266-278), but an analogous reaction with selenate could not be detected. Both purified cysteinyl-tRNA synthetase and methionyl-tRNA synthetase used selenium-containing analogs as substrates in both the ATP-pyrophosphate exchange and the aminoacylation assays.It seems that selenium-containing amino acids are excluded from proteins by a mechanism(s) other than substrate discrimination at the amino acid activation stage of protein synthesis.
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