人类葡萄糖类-1聚合动力学中的pH诱导开关
Karolina L Zapadka1, Frederik J Becher1, Shahid Uddin2
1Department of Chemistry, University of Cambridge , Cambridge CB2 1EW, U.K.
Journal of the American Chemical Society
|December 22, 2016
概括
人类葡萄糖类-1 (GLP-1) 聚合动力学显示了pH依赖的开关. 这项研究揭示了与N端质子相关的7. 5pH的异常度依赖的延迟时间,影响了制药应用.
科学领域:
- 生物化学
- 生物物理
- 制药科学
背景情况:
- 蛋白质和聚,包括粉样纤维的形成,在生物技术,制药和疾病方面具有重要意义.
- 人类葡萄糖类-1 (GLP-1) 是血糖调节的关键激素,其类似物广泛用于2型糖尿病治疗.
研究的目的:
- 阐明人类葡萄糖类-1 (GLP-1) 的聚合和粉样纤维化机制.
- 研究GLP-1聚合动力学中的pH诱导切换,并确定底层的分子决定因素.
主要方法:
- 通过在不同度和pH (7.5-8.2) 上使用硫黄素T光来监测GLP-1的粉状纤维的形成.
- 使用生物物理技术来描述聚合启动,纤维结构和稳定性.
- 估计可电离组的pKa值,以确定pH敏感的残留物.
主要成果:
- 在GLP-1聚合动力学中观察到明显的pH诱导的切换.
- 在pH8.2时,动力学与核化聚合模型保持一致.
- 在pH 7. 5下,异常的动力学显示出度延迟时间的增加,这归因于异路物种和缓慢的单体转化步骤.
结论:
- 在GLP-1聚合中,N端质子化/脱质子化被确定为pH诱导的切换的原因.
- 在促进GLP-1寡合化的条件下,偏离路径的物种形成是有利的.
- 了解这些聚合机制对于安全有效的GLP-1类药物使用至关重要.
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