Putrescine transport system in Leishmania infantum promastigotes

Molecular and Biochemical Parasitology
R Balaña-FouceJ M Alunda

Abstract

A transport system for putrescine in Leishmania infantum (= L. donovani infantum) promastigotes has been identified and characterized by measuring the uptake of radioactively labelled putrescine. Putrescine uptake was time- and temperature-dependent without any accumulation taking place at 0 degrees C. Uptake of putrescine was maximal at pH values near neutrality. Putrescine uptake showed an apparent Km = 1.08 +/- 0.12 microM and a Vmax = 1.74 + 0.62 pmol min-1 (10(6) cells)-1. The effect of metabolic poisons and uncoupling agents suggests that the putrescine uptake was energy-dependent. The transport system seemed to be highly specific for putrescine as neither aminoacids nor related compounds tested showed any competition with putrescine uptake. The trypanocide Berenil inhibited almost completely the putrescine uptake with non-competitive kinetics and a value of Ki = 43 microM.

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Citations

Jan 1, 1991·The International Journal of Biochemistry·R Balaña-FouceJ M Alunda
Jun 1, 1993·Comparative Biochemistry and Physiology. C, Comparative Pharmacology and Toxicology·C CubríaD Ordóñez
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Aug 13, 2011·The Biochemical Journal·Lyn-Marie BirkholtzOlle Heby
Oct 29, 2011·Molecular and Biochemical Parasitology·Rafael Balaña-FouceRosa M Reguera
May 24, 2005·Comparative Biochemistry and Physiology. Toxicology & Pharmacology : CBP·Rosa María RegueraRafael Balaña-Fouce
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May 28, 2019·Bioorganic & Medicinal Chemistry Letters·Elodie JaguRaphaël Labruère
Jan 1, 1997·Life Sciences·M Kandpal, B L Tekwani

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