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RESUME

Le virus de la leucémie bovine (BLV) est l'agent étiologique de la leucose bovine.

Il infecte les lymphocytes B et induit des tumeurs lymphoïdes chez les ruminants. Comme

pour tout virus enveloppé, l'infection d'une cellule par le BLV commence par la fixation

du virus sur son récepteur suivie de la fiision de l'enveloppe virale avec la membrane

cellulaire permettant l’entrée du matériel génétique du virus dans la cellule. Ces premières

étapes de l'infection virale sont médiées par les glycoprotéines d'enveloppe virale gp51 et

gp30. La gp51 assure la reconnaissance du récepteur cellulaire alors que la gp30, par son

extrémité NH

2

-terminale hydrophobe, est impliquée dans le processus de fusion. La

fusion membranaire induite par le BLV est généralement étudiée par des méthodes très

indirectes (lyse cellulaire, formation de syncytia...) qui ne permettent pas de suivre

directement la cinétique de fusion virus-cellule. Les techniques utilisant des marqueurs

fluorescents tels que l'octadécylrhodamine ou RI 8 insérés dans l'enveloppe virale

constituent une alternative intéressante pour suivre la cinétique de fusion virus-cellule

hôte.

La première partie de ce travail est consacrée à l'étude de la fusion du BLV

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