Gupta Mohit Kumar, Agarawal Meetu, Banu Khadija, Reddy K Sony, Gaur Deepak, Dhar Suman Kumar
Special Centre for Molecular Medicine, Jawaharlal Nehru University, New Delhi, India.
KIIT School of Biotechnology, KIIT University, Bhubaneswar, Odisha, India.
Biochem Biophys Res Commun. 2018 Jan 1;495(1):1285-1291. doi: 10.1016/j.bbrc.2017.11.131. Epub 2017 Nov 26.
Nucleosome assembly in P. falciparum could be the key process in maintaining its genomic integrity as DNA replicates more than once per cell cycle during several stages of its life cycle. Here, we report the functional characterization of P. falciparum chromatin assembly factor 1 (CAF1), which interacts with several proteins namely PfCAF2, Histones, PfHP1 and others. Consistent with the above findings, we demonstrate the presence of PfCAF1 at the telomeric repeat regions, central and subtelomeric var genes of multiple var gene family along with PfHP1. Further, we report the upregulation of PfCAF1 after treatment with genotoxic agents like MMS and HU. Together, these findings establish role of PfCAF1 in heterochromatin maintenance and as histone chaperone in nucleosome assembly and DNA damage repair.
在恶性疟原虫中,核小体组装可能是维持其基因组完整性的关键过程,因为在其生命周期的几个阶段,DNA在每个细胞周期中复制不止一次。在此,我们报告了恶性疟原虫染色质组装因子1(CAF1)的功能特性,它与几种蛋白质相互作用,即PfCAF2、组蛋白、PfHP1等。与上述发现一致,我们证明了PfCAF1与PfHP1一起存在于多个var基因家族的端粒重复区域、中央和亚端粒var基因中。此外,我们报告了在用MMS和HU等基因毒性试剂处理后PfCAF1的上调。总之,这些发现确立了PfCAF1在异染色质维持中的作用,以及在核小体组装和DNA损伤修复中作为组蛋白伴侣的作用。