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颠覆教科书!生命可无模板合成 DNA

颠覆教科书!生命可无模板合成 DNA

生物学教科书长期强调一条基本规则:DNA 复制必须依赖核酸模板。然而,美国斯坦福大学研究团队发现,细菌防御系统 DRT3 可以不依赖核酸模板,而是由蛋白质结构直接指导 DNA 合成。相关论文 4 月 16 日发表于《科学》(Science)。

DRT3 是一种帮助细菌抵御噬菌体的防御系统。研究表明,DRT3 依赖两种逆转录酶:一种常规酶以 RNA 为模板合成单链 DNA,另一种关键酶 Drt3b 则以自身蛋白结构充当「模板」,其活性位点的氨基酸可模拟 RNA,从而指导 DNA 序列生成。

这一发现表明,遗传信息的传递并非仅限于核酸向蛋白的单向流动,对经典中心法则构成重要补充。该系统在细菌中广泛存在,可能通过生成特殊 DNA 分子干扰噬菌体感染,但其具体机制仍有待阐明。类似 CRISPR,DRT3 未来有望被开发为可编程 DNA 合成工具,用于定制核酸分子或构建新型生物材料。

来源:《科学》新闻

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【2402】国内重点实验室分子生物学实验方法汇总(60 页)
【2403】2024 最新最全影响因子(20000+ 期刊目录)
【2404】免疫学信号通路手册
【2405】PCR 实验 protocol 汇总
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【2502】国自然中标标书模板
【2503】WB 实验详解及常见问题解答
【2504】DeepSeek 论文写作常用口令
【2505】中国科学院期刊分区表(2025 年最新版)

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  1. CONNECT:[ UseTime:0.000547s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000769s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002716s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001162s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000558s ]
  6. SELECT * FROM `set` [ RunTime:0.000227s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000745s ]
  8. SELECT * FROM `article` WHERE `id` = 553919 LIMIT 1 [ RunTime:0.000656s ]
  9. UPDATE `article` SET `lasttime` = 1777078499 WHERE `id` = 553919 [ RunTime:0.010792s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000381s ]
  11. SELECT * FROM `article` WHERE `id` < 553919 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000665s ]
  12. SELECT * FROM `article` WHERE `id` > 553919 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000416s ]
  13. SELECT * FROM `article` WHERE `id` < 553919 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000889s ]
  14. SELECT * FROM `article` WHERE `id` < 553919 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000731s ]
  15. SELECT * FROM `article` WHERE `id` < 553919 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006413s ]
0.116061s