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强大的黑激素受体配体的结合和解结合:机械模拟和实验证据
Annalida Bedini1, Gian Marco Elisi2, Fabiola Fanini1
1Dipartimento di Scienze Biomolecolari, Università degli Studi di Urbino Carlo Bo, Urbino, Italy.
精确的黑激素受体结合亲和度测量需要长时间的潜伏时间,由于缓慢的连接体解离,特别是MT2亚型. 然而,较短的潜伏时间仍然产生可靠的结构-活性关系,反映结合位点相互作用.
科学领域:
- 药理学 药理学是指药理学的学科.
- 生物化学 生化学
- 分子生物学分子生物学
背景情况:
- 放射性连接体2-[125I]iodomelatonin表现出与黑激素受体亚型 (MT1和MT2) 的缓慢解离.
- 这种缓慢的分离可以使亲和力常数测量和结构-活性关系 (SAR) 研究复杂化,可能导致在短化时间下不准确的K_i值.
研究的目的:
- 调查化时间对黑激素受体连接体的结合动力学和亲和度测量的影响.
- 为了澄清短的潜伏时间是否提供可靠的SAR数据,尽管非平衡条件.
- 通过分子建模阐明差异性连接体解离的分子基础.
主要方法:
- 动力和和结合测定使用2-[125I]iodomelatonin在短 (2h) 和长 (20h) 的潜伏时间.
- 竞争结合测定与各种黑激素受体配体 (激动剂,抗剂,选择性,非选择性).
- 从MT1和MT2受体中解离2 - iodomelatonin的分子建模模拟.
- 合成和测试UCM1014反体,然后进行分子动力学模拟.
主要成果:
- 仅在长时间的潜伏期后才能达到2-[125I]米拉托宁的平衡结合条件,特别是对于MT2受体 (约. 20小时) 的时间.
- 对一组多样化的配体的测量K_i值在很大程度上不受化时间的影响,这表明强大的SAR.
- 分子建模显示,从MT2中缓慢解离2-IOD,与氨酸的移动性受限制有关.
- 分子动力学模拟解释了UCM1014反体的立体选择性,基于结合位相互作用和配体构成.
结论:
- 长时间的潜伏时间是必要的,以达到平衡的2-[125I]iodomelatonin结合,特别是MT2.
- 尽管动力学缓慢,但在更短的潜伏时间下,亲和度测量提供了可靠的SAR数据,与结合位相互作用一致.
- 分子建模提供了对联体受体相互作用,解离机制和立体选择性的洞察.
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