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Regulation of Differentiation to the Infective Stage of the Protozoan Parasite Leishmania major by Tetrahydrobiopterin
Mark L. Cunningham, Richard G. Titus, Salvatore J. Turco and Stephen M. Beverley
New Series, Vol. 292, No. 5515 (Apr. 13, 2001), pp. 285-287
Published by: American Association for the Advancement of Science
Stable URL: http://www.jstor.org/stable/3082736
Page Count: 3
You can always find the topics here!Topics: Parasites, Pteridines, Lesions, Virulence, Promastigotes, Steepest descent method, Mice, Parasite hosts, Biochemistry, Standard deviation
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A critical step in the infectious cycle of Leishmania is the differentiation of parasites within the sand fly vector to the highly infective metacyclic promastigote stage. Here, we establish tetrahydrobiopterin (H4B) levels as an important factor controlling the extent of metacyclogenesis. H4B levels decline substantially during normal development, and genetic or nutritional manipulations showed that low H4B caused elevated metacyclogenesis. Mutants lacking pteridine reductase 1 (PTR1) had low levels of H4B, remained infectious to mice, and induced larger cutaneous lesions (hypervirulence). Thus, the control of pteridine metabolism has relevance to the mechanism of Leishmania differentiation and the limitation of virulence during evolution.
Science © 2001 American Association for the Advancement of Science