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亚洲玉米螟幼虫酚氧化酶原基因序列的生物信息学分析 被引量:4

Bioinformatical analysis of prophenoloxidase from larvae of the Asian corn borer,Ostrinia furnacalis Guenée (Lepidoptera:Pyralidae)
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摘要 酚氧化酶原PPO是昆虫免疫的关键酶,本文从生物信息学角度对亚洲玉米螟Ostrinia furnacalis Guen啨e幼虫PPO进行分析,为进一步研究其高级结构与功能的关系提供理论依据。利用我们已提交到GenBank的数据,采用在线分析及MEGA4和RasMol软件对亚洲玉米螟酚氧化酶原(Of-PPO)的核苷酸和氨基酸序列、系统发生关系和蛋白质三级结构进行分析。结果表明:Of-PPO全长cDNA序列有2686bp,包含一个2079bp的开放阅读框,其推导的693个氨基酸序列中包含6个组氨酸残基构成的2个铜离子结合位点,以及保守的硫羟酸酯区域。Of-PPO属于PPO2类群,其N端不含信号肽,无跨膜结构域区域,无糖基化位点,44个磷酸化位点均匀分布于整个多肽链中,有2段序列可能形成卷曲螺旋,有5个区域的氨基酸具较强疏水性,其二级结构中α-螺旋占22.54%,随机卷曲占56.79%。同源建模显示其三级结构为"α/β型"中的"滚筒结构",存在一个明显的空位,可能与该酶催化活性有关。本文可为Of-PPO的实验研究和应用开发提供有价值的信息。 Prophenoloxidase(PPO) is a key enzyme of insect immunity. In this study,the nucleotide sequence and deduced amino acid sequence of PPO cloned from the larvae of Ostrinia furnacalis were analyzed and predicted by the tools of bioinformatics in the following aspects: the composition of nucleotide sequences and amino acid sequences,signal peptide,trans-membrane topological structure,hydrophobicity or hydrophilicity,secondary structure,tertiary structure,etc. The results showed that the full-length cDNA of O. f...
出处 《昆虫学报》 CAS CSCD 北大核心 2009年第10期1068-1077,共10页 Acta Entomologica Sinica
基金 国家自然科学基金项目(30571248) 扬州大学科技创新培育基金(2008CXJ028)
关键词 亚洲玉米螟 酚氧化酶原 生物信息学分析 三级结构 同源建模 Ostrinia furnacalis prophenoloxidase bioinformatical analysis tertiary structure comparative modeling
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