Interactions between helicase and primase are crucial for DNA replication in the enteropathogen Clostridium difficile

Interactions between helicase and primase are crucial for DNA replication in the enteropathogen Clostridium difficile
复制标题

解旋酶和引物酶之间的相互作用对于肠道病原体艰难梭菌中的 DNA 复制至关重要

DOI:
10.1101/071829
复制
发表时间:
2016
期刊:
--
影响因子:
--
通讯作者:
Van Eijk E
Van Eijk E
中科院分区:
--
文献类型:
--
作者:
Van Eijk E

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DNA复制是生命所有领域中必不可少的保守过程,可以作为开发新抗菌剂的靶点。然而,由于对病原微生物中DNA复制机制的认识有限,这一研究进展受到了阻碍。艰难梭菌是卫生保健相关性腹泻的主要致病菌,其DNA复制机制目前还不清楚。我们鉴定了C.在体外艰难地重建解旋酶和引物酶活性。我们证明了解旋酶装载机和解旋酶之间的直接和ATP依赖性的相互作用。我们发现解旋酶的活性依赖于primase的存在。引物酶的三核苷酸特异性,我们发现这是由一个单一的赖氨酸残基决定,是类似于极端嗜热Aquifex aeolicus,但解旋酶的存在允许更有效的novosynthesis的RNA引物从非首选的三核苷酸。因此,解旋酶-引发酶相互作用构成了C中DNA复制起始的一个重要方面。艰难梭菌和解旋酶的装载和激活与革兰氏阳性模式生物枯草芽孢杆菌有很大不同。
DNA replication is an essential and conserved process in all domains of life and may serve as a target for the development of new antimicrobials. However, such developments are hindered by a limited understanding of DNA replication in pathogenic micro-organisms.Clostridium difficileis the main cause of health-care associated diarrhea and its DNA replication machinery is virtually uncharacterized. We identified the replicative helicase (CD3657), the helicase loader ATPase (CD3654) and primase (CD1454) ofC. difficileand reconstitute helicase and primase activityin vitro. We demonstrate a direct and ATP-dependent interaction between the helicase loader and the helicase. We find that helicase activity is dependent on the presence of primasein vitro. The trinucleotide specificity of primase, which we find to be determined by a single lysine residue, is similar to extreme thermophileAquifex aeolicusbut the presence of helicase allows more efficientde novosynthesis of RNA primers from non-preferred trinucleotides. Thus, helicase-primase interactions constitute a crucial aspect of DNA replication initiation inC. difficileand helicase loading and activation in this organism differs critically from that of the Gram-positive model organismBacillus subtilis.
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