磷酸甲酯封端酶Bmc1/Bin3是裂殖酵母端粒酶全酶的一个稳定组分。
The methyl phosphate capping enzyme Bmc1/Bin3 is a stable component of the fission yeast telomerase holoenzyme.
作者信息
Porat Jennifer, El Baidouri Moaine, Grigull Jorg, Deragon Jean-Marc, Bayfield Mark A
机构信息
Department of Biology, York University, Toronto, Canada.
LGDP-UMR5096, Université de Perpignan Via Domitia, Perpignan, France.
出版信息
Nat Commun. 2022 Mar 11;13(1):1277. doi: 10.1038/s41467-022-28985-3.
The telomerase holoenzyme is critical for maintaining eukaryotic genome integrity. In addition to a reverse transcriptase and an RNA template, telomerase contains additional proteins that protect the telomerase RNA and promote holoenzyme assembly. Here we report that the methyl phosphate capping enzyme (MePCE) Bmc1/Bin3 is a stable component of the S. pombe telomerase holoenzyme. Bmc1 associates with the telomerase holoenzyme and U6 snRNA through an interaction with the recently described LARP7 family member Pof8, and we demonstrate that these two factors are evolutionarily linked in fungi. Our data suggest that the association of Bmc1 with telomerase is independent of its methyltransferase activity, but rather that Bmc1 functions in telomerase holoenzyme assembly by promoting TER1 accumulation and Pof8 recruitment to TER1. Taken together, this work yields new insight into the composition, assembly, and regulation of the telomerase holoenzyme in fission yeast as well as the breadth of its evolutionary conservation.
端粒酶全酶对于维持真核生物基因组完整性至关重要。除了逆转录酶和RNA模板外,端粒酶还包含其他蛋白质,这些蛋白质可保护端粒酶RNA并促进全酶组装。在此,我们报道磷酸甲酯封端酶(MePCE)Bmc1/Bin3是粟酒裂殖酵母端粒酶全酶的一个稳定组分。Bmc1通过与最近描述的LARP7家族成员Pof8相互作用,与端粒酶全酶和U6 snRNA缔合,并且我们证明这两个因子在真菌中是进化相关的。我们的数据表明,Bmc1与端粒酶的缔合独立于其甲基转移酶活性,而是Bmc1通过促进TER1积累和Pof8募集到TER1,在端粒酶全酶组装中发挥作用。综上所述,这项工作为裂殖酵母中端粒酶全酶的组成、组装和调控及其进化保守性的广度提供了新的见解。
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