Disease relevance of Scenedesmus

• Proliferation toxicity toward the algae Scenedesmus vacuolatus in a 24 h one-generation reproduction assay was determined for nitrobenzene and 18 derivatives, including two phenols [1].
• All the green algae secreted significant amounts of folate and biotin and all but Scenedesmus secreted pantothenate into their growth medium; Anabaena secreted folate and pantothenate [2].
• The two species Daphnia magna and D. galeata were fed different mixtures of the sterol-containing green alga Scenedesmus obliquus and the sterol-free cyanobacterium Synechococcus elongatus; a higher proportion of Synechococcus in the food is equivalent to a decrease in dietary sterols [3].
• In class II photolyases (Streptomyces griseus, Scenedesmus acutus, Anacystis nidulans, Methanobacterium thermoautotrophicum) the pterin chromophore is replaced by an 8-hydroxy-5-deazaflavin derivative [4].
• Growth inhibition and immobility tests for fluoranthene and its metabolites were carried out using algae (Scenedesmus subspicatus), bacteria (Pseudomonas putida) and crustaceans (Daphnia magna and Thamnocephalus platyurus) [5].

High impact information on Scenedesmus

• The results of ultrastructural studies and transmission electron microscope microanalysis of two Scenedesmus strains experimentally exposed to copper sulfate are presented [6].
• Because tocopherol-deficient mutants in the green alga Scenedesmus obliquus can synthesize carotenoids, our findings demonstrate conclusively that plastoquinone is an essential component in carotenoid synthesis [7].
• The LF-1 mutant strain of Scenedesmus (isolated by Dr. Norman Bishop) is incapable of processing pre-D1 [8].
• Photoinactivation and light-dependent degradation of the D1 protein were drastically increased in the Scenedesmus obliquus LF-1 mutant cells altered in its PSII manganese binding and thus unable to reduce PQ using water as an electron donor [9].
• The mitochondrial group IIB intron rI1, from the green algae Scenedesmus obliquus ' LSUrRNA gene, has been introduced into the lacZ gene encoding beta-galacto-sidase [10].

Chemical compound and disease context of Scenedesmus

• Toxicity and bioaccumulation of cadmium in the colonial green alga Scenedesmus obliquus [11].
• Toxicity of cypermethrin on growth, pigments, and superoxide dismutase of Scenedesmus obliquus [12].
• Mercury chloride toxicity was investigated in two strains of Chlorella and in a strain of Scenedesmus isolated from polluted areas in Tuscany (Italy) [13].
• A mode of action study of herbicidal diphenylpyrrolidinones was carried out through carotenoid analyses in intact Scenedesmus cells and by a cell-free plant-type phytoene desaturase assay using Escherichia coli transformants [14].
• Toxicity of sulfonylurea herbicides to the green alga Scenedesmus vacuolatus: predictability of combination effects [15].

Biological context of Scenedesmus

• The self-splicing group II intron (rl1) from Scenedesmus obliquus mitochondria together with its 6 bp intron binding site (IBS1) were inserted in the correct and inverse orientation into the chloroplast tscA gene from C.reinhardtii [16].
• The chloroplast elongator methionine-accepting tRNA from the green alga Scenedesmus obliquus was purified and and its nucleotide sequence determined [17].
• DNA sequence analysis of the complete mitochondrial genome of the green alga Scenedesmus obliquus: evidence for UAG being a leucine and UCA being a non-sense codon [18].
• Effects of diazepam on photosynthesis, respiration, rubidium uptake, and finestructure of Scenedesmus obliquus in synchronous cultures [19].
• Biotransformation of 1-naphthalenesulfonic acid by the green alga Scenedesmus obliquus [20].

Anatomical context of Scenedesmus

• Adenine inhibition of the synthesis of photosynthetic membranes in the chloroplast of Scenedesmus obliquus grown in the dark [21].
• In Scenedesmus obliquus not only all plastid isoprenoids (carotenoids and prenyl side chains of chlorophylls and plastoquinone-9) were formed via this novel pathway, but also the non-plastid cytoplasmic sterols [22].

Associations of Scenedesmus with chemical compounds

• Isoprenoid biosynthesis was investigated in the green alga Scenedesmus obliquus grown heterotrophically on 13C-labelled glucose and acetate [23].
• Intermediates of tocopherol biosynthesis in the unicellular alga Scenedesmus obliquus. The presence of three isomeric methylphytylbenzoquinones [24].
• Biosynthesis of isoprenoids (carotenoids, sterols, prenyl side-chains of chlorophylls and plastoquinone) via a novel pyruvate/glyceraldehyde 3-phosphate non-mevalonate pathway in the green alga Scenedesmus obliquus [23].
• Three isomers of methylphytylbenzoquinone have been isolated from lipids of the unicellular alga Scenedesmus obliquus, the most abundant being 2-methyl-6-phytylbenzoquinone (65% of the total) [24].
• The "high-affinity Mn-binding site" in Mn-depleted photosystem II (PS II) membrane fragments isolated from Scenedesmus obliquus was examined by using the diphenylcarbazide (DPC)/Mn2+ non-competitive inhibition assay [Preston, C., & Seibert, M. (1991) Biochemistry (preceding paper in this issue)] [25].

Gene context of Scenedesmus

• A homogeneous multimeric protein isolated from the green alga, Scenedesmus obliquus, has both latent phosphoribulokinase activity and glyceraldehyde-3-phosphate dehydrogenase activity [26].
• The diphenylcarbazide(DPC)/Mn2+ assay [Hsu, B.-D., Lee, J.-Y., & Pan, R.-L. (1987) Biochim. Biophys. Acta 890, 89-96] was used to assess the amount of the high-affinity Mn-binding site in manganese-depleted photosystem II (PS II) membrane fragments from spinach and Scenedesmus obliquus [27].
• Redox control of hydrogenase activity in the green alga Scenedesmus obliquus by thioredoxin and other thiols [28].
• The glutathione-S-transferase (GST, EC 2.5.1.18) activities in different freshwater microalgal species, namely, Chlorella vulgaris, Scenedesmus quadricauda, Scenedesmus platydiscus and Selenastrum capricornutum under the control condition (without pyrene addition) and at different pyrene concentrations were compared [29].
• The green alga Scenedesmus pupukensis and the red alga Porphyra spiralis contain large group-IC1 introns in their nuclear small subunit ribosomal RNA genes due to the presence of open reading frames at the 5' end of the introns [30].

Analytical, diagnostic and therapeutic context of Scenedesmus

• Modulated PAM fluorometry and Plant Efficiency Analyser methods were used to investigate photosynthetic fluorescence parameters of alga Scenedesmus obliquus exposed to inhibitory effect of fungicides copper sulphate and fludioxonil (N-(4-nitrophenyl)-N'-propyl-uree) [31].

References