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随机异聚物作为仿酶:段尺度侧链编程的位点构建「Nature」

  • 2026-02-06 18:53:39
随机异聚物作为仿酶:段尺度侧链编程的位点构建「Nature」

酶依赖精确序列与折叠,在纳米尺度聚合多种弱相互作用形成可重复的活性位点,而合成“酶模拟”材料往往在可加工性与位点精确性之间受限。UC Berkley的研究者在Nature报道《Random heteropolymers as enzyme mimics》,提出以“一锅法随机杂共聚物(RHP)的段尺度侧链投影编程”在不依赖严格序列与折叠的前提下获得酶样反应。以转化率/选择性与周转为主要标尺,在香茅醛(citronellal)环化中,RHP-S1 将转化率由 51 ± 17% 提升至 91 ± 5%,并将异蒲勒醇/薄荷二醇选择性由 55 ± 22% 提升至 76 ± 5%(n=3;pH 7、RHP≈1 mM、底物 10 mM、60 °C、200 mtorr、24 h;见图2c;周转约 11/24 h;SHC 突变体 I261A:周转约 7/40 h,补表2)。在 ABTS/CHP 过氧化体系中,血红素结合的 RHP 给出 kcat=9.0 ± 1.4 s−1,文中据此报告其相对辣根过氧化物酶提升超过 10 倍(见图4a),并在 80 °C 退火循环 5 次后仍保持>90%过氧化活性(见图4d)。

图1 | 作为蛋白质模拟物的刚性螺旋聚合物(RHPs)的片段设计。

设计起点来自对 1,378 个金属蛋白活性位点的统计:位点内部疏水,并呈现“少数关键残基高度特异+周边残基多样且频率近似”的双峰模式(见图1a)。作者据此以“关键单体”对应功能残基(如以 SPMA 作为酸催化等效位点),再通过单体配比与共聚活性比偏置关键单体邻域,使关键位点更常落入疏水段;滑动窗口 HLB 与主成分分析显示 RHP-S1 富集更多“含 SPMA 的疏水段”(见图1d),从而调控关键侧链的局域脱水与可动性。

图2 | 用于调控侧链投射的RHP片段编程。

围绕香茅醛环化,作者用中子散射与分子动力学揭示 RHP 的段尺度动态异质性(见图2a),并以 XANES、NOESY 与分子动力学快照支持底物在 SPMA 邻域富集及相对脱水的伪活性位点图像(见图2b),与 SDS 和 Triton X-100 均<30% 烯烃选择性的对照相呼应(见图2c)。在氧化还原体系中,含 NHSMA 的 RHP 经组胺后修饰提供配位位点,结合血红素后回转半径由 4.1 nm 收缩至 3.6 nm(25 mM 磷酸盐缓冲液、pH≈8、100 mM KCl;见图3b),UV–Vis 与 EPR 对照指向类细胞色素的配位环境(见图3c、图3e);其进一步封装进聚己内酯电纺纤维并保留 8.3 ± 2.4% 溶液活性(n=3;见图4c),表明该类位点可在材料加工条件下维持可测的功能输出。

图3 | 设计RHP作为血红素结合蛋白。

图4 | 催化材料的RHP片段设计。

该工作以随机异聚物取代严格序列蛋白,通过共聚参数与段尺度疏水微环境编程,使关键官能团在局域脱水条件下形成可重复的“伪活性位点”,从而在温和水相实现酸催化与氧化还原等仿酶反应。研究为可规模合成、可加工并具耐热性的仿酶材料提供了通用设计框架,拓展了酶催化在材料体系中的工程化实现路径。

参考文献:Yu, H. et al. Random heteropolymers as enzyme mimics. Nature 649, 83–90 (2026). https://doi.org/10.1038/s41586-025-09860-9.

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  1. CONNECT:[ UseTime:0.000602s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000840s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.012136s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003948s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000703s ]
  6. SELECT * FROM `set` [ RunTime:0.028889s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000574s ]
  8. SELECT * FROM `article` WHERE `id` = 468387 LIMIT 1 [ RunTime:0.018049s ]
  9. UPDATE `article` SET `lasttime` = 1770484864 WHERE `id` = 468387 [ RunTime:0.017185s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.010622s ]
  11. SELECT * FROM `article` WHERE `id` < 468387 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.027434s ]
  12. SELECT * FROM `article` WHERE `id` > 468387 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001176s ]
  13. SELECT * FROM `article` WHERE `id` < 468387 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.026232s ]
  14. SELECT * FROM `article` WHERE `id` < 468387 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.119962s ]
  15. SELECT * FROM `article` WHERE `id` < 468387 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.025097s ]
0.365371s