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Molecular characterization of 5S ribosomal RNA genes and transcripts in the protozoan parasite Leishmania major

机译:原生动物寄生虫利什曼原虫5S核糖体RNA基因和转录本的分子特征

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摘要

Eukaryotic 5S rRNA, synthesized by RNA polymerase III (Pol III), is an essential component of the large ribosomal subunit. Most organisms contain hundreds of 5S rRNA genes organized into tandem arrays. However, the genome of the protozoan parasite Leishmania major contains only 11 copies of the 5S rRNA gene, which are interspersed and associated with other Pol III-transcribed genes. Here we report that, in general, the number and order of the 5S rRNA genes is conserved between different species of Leishmania. While in most organisms 5S rRNA genes are normally associated with the nucleolus, combined fluorescent in situ hybridization and indirect immunofluorescence experiments showed that 5S rRNA genes are mainly located at the nuclear periphery in L. major. Similarly, the tandemly repeated 5S rRNA genes in Trypanosoma cruzi are dispersed throughout the nucleus. In contrast, 5S rRNA transcripts in L. major were localized within the nucleolus, and scattered throughout the cytoplasm, where mature ribosomes are located. Unlike other rRNA species, stable antisense RNA complementary to 5S rRNA is not detected in L. major.
机译:由RNA聚合酶III(Pol III)合成的真核5S rRNA是大核糖体亚基的重要组成部分。大多数生物都包含成百上千个串联排列的5S rRNA基因。但是,原生动物寄生虫利什曼原虫的基因组仅包含11个拷贝的5S rRNA基因,其间散布着其他Pol III转录基因并与之相关。在这里,我们报告,一般来说,利什曼原虫的不同物种之间5S rRNA基因的数量和顺序是保守的。虽然在大多数生物中,5S rRNA基因通常与核仁相关,但结合的荧光原位杂交和间接免疫荧光实验表明5S rRNA基因主要位于大麦芽孢杆菌的核外围。同样,克鲁斯锥虫中串联重复的5S rRNA基因分散在整个核中。相反,L。major中的5S rRNA转录物位于核仁中,并散布在成熟核糖体所在的细胞质中。与其他rRNA物种不同,在大麦芽孢杆菌中未检测到与5S rRNA互补的稳定反义RNA。

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