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N端6-甲基辛酰基化修饰对小肽KTKKKFLKKT结构的影响 被引量:1

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摘要 得到生物活性肽的三维结构,有助于预测和理解其功能机理.研究发现对小肽KT-KKKFLKKT的N端进行6-甲基辛酰基化修饰后,其细胞毒性增强.用nnPredict服务器预测,发现该小肽具有α螺旋二级结构序列特征.为研究此修饰造成该小肽细胞毒性增强的分子机理,用AM-BER软件对该小肽进行全原子折叠模拟,发现其最低能量结构确实形成右手α螺旋,再对该结构的N端进行6-甲基辛酰基化修饰后,以分子动力学模拟计算,发现6-甲基辛酸可通过与氨基酸侧链间的疏水作用破坏小肽最低能量结构的α螺旋,增强了该小肽疏水相互作用,这可能是此修饰造成该小肽细胞毒性增强的原因所在,这为指导实验研究其细胞毒性分子机理和进一步修饰设计奠定了基础.
出处 《自然科学进展》 北大核心 2009年第10期1056-1061,共6页
基金 国家重点基础研究发展计划(批准号:001CB510206 2009CB918301) 国家自然科学基金(批准号:30430310和30670791)资助项目
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