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Plasmodium falciparum SSB tetramer binds single-stranded DNA only in a fully wrapped mode

机译:恶性疟原虫SSB四聚体仅以完全包裹的方式结合单链DNA

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The tetrameric Escherichia coli single-stranded DNA (ssDNA) binding protein (Ec-SSB) functions in DNA metabolism by binding to ssDNA and interacting directly with numerous DNA repair and replication proteins. Ec-SSB tetramers can bind ssDNA in multiple DNA binding modes that differ in the extent of ssDNA wrapping. Here, we show that the structurally similar SSB protein from the malarial parasite Plasmodium falciparum (Pf-SSB) also binds tightly to ssDNA but does not display the same number of ssDNA binding modes as Ec-SSB, binding ssDNA exclusively in fully wrapped complexes with site sizes of 52-65nt/tetramer. Pf-SSB does not transition to the more cooperative (SSB) 35 DNA binding mode observed for Ec-SSB. Consistent with this, Pf-SSB tetramers also do not display the dramatic intra-tetramer negative cooperativity for binding of a second (dT) 35 molecule that is evident in Ec-SSB. These findings highlight variations in the DNA binding properties of these two highly conserved homotetrameric SSB proteins, and these differences might be tailored to suit their specific functions in the cell.
机译:四聚体大肠杆菌单链DNA(ssDNA)结合蛋白(Ec-SSB)通过与ssDNA结合并直接与众多DNA修复和复制蛋白相互作用而在DNA代谢中发挥作用。 Ec-SSB四聚体可以多种DNA结合模式结合ssDNA,但结合方式不同。在这里,我们显示出来自疟疾寄生虫恶性疟原虫(Pf-SSB)的结构相似的SSB蛋白也与ssDNA紧密结合,但未显示出与Ec-SSB相同数量的ssDNA结合模式,仅将ssDNA与完全包裹的复合物结合站点大小为52-65nt /四聚体。 Pf-SSB不会过渡到Ec-SSB观察到的更合作(SSB)35 DNA结合模式。与此相一致,Pf-SSB四聚体也没有表现出与第二个(dT)35分子结合的显着四聚体内负协同作用,这在Ec-SSB中是显而易见的。这些发现突显了这两个高度保守的同四聚体SSB蛋白在DNA结合特性方面的差异,这些差异可能适合其在细胞中的特定功能。

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