禾谷炭疽菌中剪接因子SR蛋白的生物信息学分析及基因克隆

Bioinformatics Analysis on Splicing Factor SR Protein and Gene Cloning in Colletotrichum Graminicola

  • 摘要: Serine/arginine-rich(SR)蛋白参与前体mRNA剪接及mRNA代谢等多种生理生化活动。以裂殖酵母(Schizosaccharomyces pombe)中两个典型SR蛋白序列为基础, 利用Blastp和关键词对禾谷炭疽菌蛋白质数据库进行比对分析, 明确该菌中具有2个SR蛋白CgSrp1和CgSrp2;通过SMART保守结构域分析, 明确CgSrp1和CgSrp2蛋白的N端都含有RNA识别结构域, C端含有丝氨酸/精氨酸二肽序列; 利用NCBI中BLASTp程序与其他物种进行相似性分析, 构建系统进化树, 并通过氨基酸序列比对发现SR蛋白在植物和真菌之间的差异性; 同时, 通过对CgSrp1和CgSrp2蛋白的理化性质、疏水性、亚细胞定位及二、三级结构等进行生物信息学分析, 明确CgSrp1和CgSrp2都是亲水性蛋白质, 二者均定位于细胞核, 含有α螺旋、β折叠和无规则卷曲三种结构; 以野生型禾谷炭疽菌CgM2为模板, 成功克隆了CgSRP1和CgSRP2基因片段, 明确CgM2存在CgSRP1和CgSRP2基因。

     

    Abstract: Serine/arginine-rich (SR) protein, as a splicing factor, plays a crucial role in many physiological and biochemical processes, especially in precursor mRNA splicing and mRNA metabolism. Based on two typical SR protein in Schizosaccharomyces pombe, to search SR protein sequence from the protein database of Colletotrichum graminicola with Blastp and keywords, two SR proteins CgSrp1 and CgSrp2 were identified in Colletotrichum graminicola. CgSrp1 and CgSrp2 contain the N-terminal RNA Recognition Motif domain and serine/arginine dipeptides towards the C-terminus with SMART analysis. BLASTp in NCBI was used to perform homology analysis and construct phylogenetic trees with other species. Sequence variation of SR proteins was discovered between plants and fungi by amino acids alignment. Meanwhile, bioinformatics analysis on SR protein was made including the physical and chemical properties, hydrophobicity, subcellularlocalization, the secondary and tertiary structure. It is showed that CgSrp1 and CgSrp2 were hydrophilic proteins, both of them located in the nucleus and contained α-helixs, β-sheets and random coil. CgSRP1 and CgSRP2 gene fragments were successfully cloned using wild-type Colletotrichum graminicola CgM2 DNA as template, indicating the presence of CgSRP1 and CgSRP2 genes in CgM2.

     

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