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Role of cloned carotenoid genes expressed in Escherichia coli in protecting against inactivation by near-UV light and specific phototoxic molecules.
J Bacteriol
October 1988
Department of Microbiology, University of Illinois, Urbana-Champaign 61801.
Genes controlling carotenoid synthesis were cloned from Erwinia herbicola and expressed in an Escherichia coli strain. Carotenoids protect against high fluences of near-UV (NUV; 320 to 400 nm) but not against far-UV (200-300 nm). Protection of E.
View Article and Find Full Text PDFPotentially useful antimicrobial and antiviral phototoxins from plants.
Photochem Photobiol
July 1987
The wide range of naturally occurring compounds from microorganisms and plants which are phototoxic in UV-A light (320-400 nm) includes cinnamyl esters, coumarins and furanocoumarins, furanochromones, benzofurans, alkaloids, based on tryptophan or phenylalanine, extended naptho-and anthraquinones, polyacetylenes and their thiophene derivatives. The cellular targets are cell membranes, e.g.
View Article and Find Full Text PDFLight-mediated allelochemical effects of naturally occurring polyacetylenes and thiophenes from asteraceae on herbivorous insects.
J Chem Ecol
April 1986
Ottawa Carleton Centre for Graduate Studies and Research in Biology and Chemistry, University of Ottawa, K1N 6N5, Ottawa, Ontario, Canada.
Polyacetylenes and their thiophene derivatives, characteristic secondary metabolites of the Asteraceae, were examined for their effects on herbivorous insects. Three thiophenes (a monothiophene, a bithiophene, and α-terthienyl) and four polyacetylenes (phenylheptatriyne, phenylheptadiynene, phenylheptadiyene acetate, and matricaria lactone) were studied for their phototoxicity and light-independent toxicity to (1) a polyphagous lepidopteran,Ostrinia nubilalis, whose host range includes a number of phototoxic Asteraceae, (2) a polyphagous lepidoteran,Euxoa messoria, whose host range includes very few species of Asteraceae, and (3) an oligophagous lepidopteran,Manduca sexta, which is a specialist on Solanaceae. Several compounds were phototoxic toM.
View Article and Find Full Text PDFThe tropical weed Bidens pilosa L. (Asteraceae) contains a number of polyacetylenes which are phototoxic to bacteria, fungi, and human fibroblast cells in the presence of sunlight, artificial sources of long-wave ultraviolet light, or cool-white fluorescent light. The principle photoactive compound in the leaf, phenylheptatriyne, is present in the cuticle as well as in the underlying cells.
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