The unusually large Plasmodium telomerase reverse-transcriptase localizes in a discrete compartment associated with the nucleolus.

The unusually large Plasmodium telomerase reverse-transcriptase localizes in a discrete compartment associated with the nucleolus.
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DOI:
10.1093/nar/gki260
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发表时间:
2005
影响因子:
14.9
通讯作者:
Scherf A
Scherf A
中科院分区:
生物学2区
文献类型:
--
作者:
Figueiredo LM;Rocha EP;Mancio-Silva L;Prevost C;Hernandez-Verdun D;Scherf A

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端粒酶复制染色体末端,这是维持基因组完整性所必需的功能。我们已经确定了基因编码的催化逆转录酶(RT)的组分,这种酶的疟疾寄生虫恶性疟原虫(PfTERT),以及orthopathic基因从两个啮齿动物和一个猿猴疟疾物种。PfTERT被预测为编码一种碱性蛋白,其包含先前在已知端粒酶RT(TERTs)中鉴定的主要序列基序。在约2500个氨基酸处,PfTERT比其他表征的TERT大三倍。我们观察到显着的序列多样性之间的TERT蛋白质的不同疟原虫物种,与保守的结构域交替与高变区。免疫荧光分析显示,PfTERT在已经开始DNA合成的无性血液阶段寄生虫中表达。令人惊讶的是,而不是在端粒簇,PfTERT通常定位到一个离散的核隔室。我们进一步证明,这个车厢与核仁,在此定义的恶性疟原虫的第一次。
Telomerase replicates chromosome ends, a function necessary for maintaining genome integrity. We have identified the gene that encodes the catalytic reverse transcriptase (RT) component of this enzyme in the malaria parasite Plasmodium falciparum (PfTERT) as well as the orthologous genes from two rodent and one simian malaria species. PfTERT is predicted to encode a basic protein that contains the major sequence motifs previously identified in known telomerase RTs (TERTs). At ∼2500 amino acids, PfTERT is three times larger than other characterized TERTs. We observed remarkable sequence diversity between TERT proteins of different Plasmodial species, with conserved domains alternating with hypervariable regions. Immunofluorescence analysis revealed that PfTERT is expressed in asexual blood stage parasites that have begun DNA synthesis. Surprisingly, rather than at telomere clusters, PfTERT typically localizes into a discrete nuclear compartment. We further demonstrate that this compartment is associated with the nucleolus, hereby defined for the first time in P.falciparum.
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