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IF48.5!东北农业大学校史首篇《Nature》!

  • 2026-06-08 23:31:16
IF48.5!东北农业大学校史首篇《Nature》!

IF48.5!东北农业大学校史首篇《Nature》!

📍东北农业大学联合中国科学院物理研究所、北京大学等单位在《Nature》发表研究。

首次解析人胆汁酸转运蛋白OSTα-OSTβ的高分辨率结构。揭示其独特双向转运机制。

这是东北农业大学首次作为通讯作者单位在《Nature》发表论文,打破校史。

🌍研究背景与科学问题: 胆汁酸是调节脂质代谢与炎症的关键分子。

OSTα-OSTβ是维持胆汁酸稳态的核心转运蛋白,其突变可致胆汁淤积等肝病。

但该复合物的组装方式、底物识别与转运机制,困扰学界数十年。

🌟本研究要回答: OSTα和OSTβ如何组装成功能性复合物?胆汁酸如何被识别并跨膜转运?

⏩主要发现:
🔹全新二聚体加异二聚体组装:两个OSTα组成同源二聚体核心,两个OSTβ结合在外围。OSTα采用G蛋白受体样折叠,OSTβ是单次跨膜蛋白。

🔹蛋白和脂质一起识别底物:OSTα的胞内环ICL2有7个脂肪修饰位点。

这些位点与跨膜螺旋5和6以及胆固醇共同构成胆汁酸结合口袋,脂质直接参与底物结合。

🔹正电空腔推动翻转转运:OSTα内部有一个正电空腔,关键残基K191吸引底物的负电头基,

推动胆汁酸在膜两侧完成从头朝下到头朝上的构象翻转,从而实现双向转运,不需要传统的交替通路机制。

🎯研究方法亮点:
🔸高分辨冷冻电镜:解析OSTα-OSTβ与胆固醇(2.64 Å)及内源底物DHEAS(2.73 Å)的原子级结构。

🔸多技术联用:结合生化功能测定、定点突变、FRET光谱、GFP热稳定性及分子动力学模拟,包括常规模拟和计算机动态模拟,全面验证转运机制。

🔸致病突变验证:构建OSTβ-F27fs和OSTα-Q186*等致病突变,证明亚基组装对功能不可缺少。

👥结论:
◾ 首次揭示人OSTα-OSTβ的非经典二聚体加异二聚体三维结构,以及脂质辅助构象翻转的双向转运机制,这与所有已知胆汁酸转运蛋白都不同。

◾ 发现脂肪修饰和正电空腔残基K191是转运活性的关键决定因素,为胆汁酸稳态调控提供全新分子基础。

◾ 为靶向OSTα-OSTβ治疗胆汁淤积、非酒精性脂肪性肝炎及药物性肝损伤提供了结构药理学依据。

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  1. CONNECT:[ UseTime:0.001080s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001542s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001057s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.006852s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001684s ]
  6. SELECT * FROM `set` [ RunTime:0.005062s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001618s ]
  8. SELECT * FROM `article` WHERE `id` = 536441 LIMIT 1 [ RunTime:0.011303s ]
  9. UPDATE `article` SET `lasttime` = 1781288720 WHERE `id` = 536441 [ RunTime:0.008270s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000739s ]
  11. SELECT * FROM `article` WHERE `id` < 536441 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007431s ]
  12. SELECT * FROM `article` WHERE `id` > 536441 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001218s ]
  13. SELECT * FROM `article` WHERE `id` < 536441 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002956s ]
  14. SELECT * FROM `article` WHERE `id` < 536441 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002163s ]
  15. SELECT * FROM `article` WHERE `id` < 536441 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002212s ]
0.252004s