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The role of transferrin-receptor variation in the host range of Trypanosoma brucei.

机译:转铁蛋白受体变异在布鲁氏锥虫宿主范围内的作用。

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Trypanosoma brucei is a unicellular parasite transmitted between African mammals by tsetse flies. T. brucei multiplies freely in the bloodstream of many different mammals, and survives by antigenic variation of the main component of its surface coat, variant surface glycoprotein (VSG). Trypanosomes take up transferrin through a heterodimeric transferrin receptor, the genes for which are expressed in telomeric expression sites along with the VSG gene. There are up to 20 of these expression sites per trypanosome nucleus, but usually only one is active at a time. Different expression sites encode transferrin receptors that are similar but not identical. Here we show that these small differences between transferrin receptors can have profound effects on the binding affinity for transferrins from different mammals, and on the ability of trypanosomes to grow in the sera of these mammals. Our results suggest that the ability to switch between different transferrin-receptor genes allows T. brucei to cope with the large sequence diversity in the transferrins of its hosts.
机译:布氏锥虫是非洲采采蝇在非洲哺乳动物之间传播的单细胞寄生虫。 T. brucei在许多不同的哺乳动物的血液中自由繁殖,并通过其表面被覆的主要成分变异表面糖蛋白(VSG)的抗原变异而存活。锥虫通过异二聚体转铁蛋白受体吸收转铁蛋白,其基因与VSG基因一起在端粒表达位点表达。每个锥虫核最多有20个这些表达位点,但通常一次只有一个处于活动状态。不同的表达位点编码相似但不相同的转铁蛋白受体。在这里,我们显示了转铁蛋白受体之间的这些细微差别可能对来自不同哺乳动物的转铁蛋白的结合亲和力以及锥虫在这些哺乳动物的血清中生长的能力产生深远影响。我们的结果表明,在不同的转铁蛋白受体基因之间进行切换的能力使布鲁氏杆菌能够应对其宿主转铁蛋白中的大序列多样性。

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