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Finding needles in DNA stacks

机译:在DNA堆栈中寻找针头

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摘要

Locating the 10~4 damaged nucleo-tides in a cell's DNA poses a significant challenge to DNA repair enzymes on a daily basis (1). Base excision repair (BER) glycosy-lases are responsible for finding subtle atomic-level changes in a base amidst a sea of undamaged bases, and they must do so before replication leads to improper nucleotide insertion causing a mutation (2). Many years ago it was recognized that random on-off binding of proteins to duplex DNA was an inefficient way to locate the sites of damage, leading to proposals of protein sliding on the duplex in addition to short hopping or longer-range jumping to different sections of the genome (3).
机译:每天在细胞的DNA中定位10〜4个受损的核苷酸对DNA修复酶提出了重大挑战(1)。碱基切除修复(BER)糖基化酶负责在未损坏的碱基海中发现碱基中的细微原子级变化,并且必须这样做,然后复制才能导致核苷酸插入不当而引起突变(2)。许多年前,人们已经认识到蛋白质与双链体DNA的随机开关结合是定位损伤位点的一种无效方法,这导致了蛋白质在双链体上滑动的建议,除了短距离跳跃或长距离跳跃到不同区域外基因组(3)。

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