This work is to investigate the effect of ribosome maturation factor dbpA on the initiation of DNA replication in Escherichia coli. The phenotype changes such as DNA replication pattern,doubling time and cell size of ΔdbpA deletion mutants were observed,and thetemperature sensitivity test and protein quantitative experiment were used to study the action mechanisms of dbpA. The results showed that themild phenotypic change such as the delayed initiation of DNA replication,prolonged doubling time,declined cel...
【基金】
内蒙古民族大学科学研究基金(NMDYB1747)
【更新日期】
2019-01-18
【分类号】
Q75
【正文快照】
DbpA是依赖ATP的3'-5'RNA解旋酶,分子量为49.188 k D,主要在核糖体50S亚基形成的晚期发挥作用[1-2]。DbpA有一个DEAD盒,这是依赖RNA的ATP酶/解旋酶的特征[3]。DbpA特异地与23SrRNA的92号发夹结合,并表现出依赖RNA的ATP酶(ATPase)活性,水解一分子ATP可以解开8 bp的双链RNA[4]。?