title: Selenium as a novel regulator of porphyrin biosynthesis in germinating seedlings of mung bean (Phaseolus vulgaris).
abstract: 5-Aminolevulinic acid, porphyrin and chlorophyll contents as well the activities of 5-aminolevulinic acid dehydratase and PBG deaminase were studied in selenium treated mung bean seedlings. Selenium had no effect on 5-aminolevulinic acid synthetic ability but inhibited 5-aminolevulinic acid dehydratase and PBG deaminase activities. Further, it was observed that selenium induced accumulation of protoporphyrin-IX and Mg-protoporphyrin ester and decreased chlorophyll levels in both light and dark-grown seedlings. The results suggest the possible regulatory role of selenium on chlorophyll synthesis by interacting with sulfhydryl containing enzymes 5-aminolevulinic acid dehydratase and porphobilinogen deaminase.
authors.affiliation: Department of Biochemistry, Sri Venkateswara University, Tirupathi, Andhra Pradesh, India.
authors.forename: K
authors.initials: K
authors.lastname: Padmaja
authors.forename: D D
authors.initials: DD
authors.lastname: Prasad
authors.forename: A R
authors.initials: AR
authors.lastname: Prasad
mesh_terms: D000622:Aminolevulinic Acid / Q000378:metabolism*; D002734:Chlorophyll / Q000096:biosynthesis*; D007887:Fabaceae / Q000378:metabolism*; D011163:Hydroxymethylbilane Synthase / Q000378:metabolism; D010946:Plants, Medicinal; D000623:Porphobilinogen Synthase / Q000378:metabolism; D011166:Porphyrins / Q000096:biosynthesis*; D012643:Selenium / Q000502:physiology*
chemical_list: D011166:Porphyrins; D002734:Chlorophyll; D000622:Aminolevulinic Acid; D011163:Hydroxymethylbilane Synthase; D000623:Porphobilinogen Synthase; D012643:Selenium