CAJ | 학술논문

根据已知多毛类Alitta succinea铜锌超氧化物歧化酶( Cu/Zn-SOD)基因序列设计引物,利用同源克隆及RACE方法首次从双齿围沙蚕Perinereis aibuhitensis中克隆得到Cu/Zn-SOD基因全长cDNA序列。结果表明：双齿围沙蚕Cu/Zn-SOD基因cDNA全长870 bp,其中包括156 bp的5′端非编码区,261 bp 3′端非翻译区和453 bp 开放阅读框,编码150个氨基酸；该蛋白序列具有典型的Cu2+和Zn2+结合位点,并具有两处Cu/Zn-SOD 蛋白家族标签序列。通过生物信息学分析表明,该蛋白属于胞内Cu/Zn-SOD,理论相对分子质量为15249900,等电点为5.66,无信号肽和跨膜区,推测为亲水性蛋白。同源性分析表明,双齿围沙蚕Cu/Zn-SOD氨基酸序列与部分软体动物、鱼类和昆虫的Cu/Zn-SOD蛋白序列具有很高的相似性。该研究结果为后续研究Cu/Zn-SOD与环境污染物之间的剂量效应关系奠定了基础,为研究双齿围沙蚕机体的防御机制提供了基础资料。
근거이지다모류Alitta succinea동자초양화물기화매( Cu/Zn-SOD)기인서렬설계인물,이용동원극륭급RACE방법수차종쌍치위사잠Perinereis aibuhitensis중극륭득도Cu/Zn-SOD기인전장cDNA서렬。결과표명：쌍치위사잠Cu/Zn-SOD기인cDNA전장870 bp,기중포괄156 bp적5′단비편마구,261 bp 3′단비번역구화453 bp 개방열독광,편마150개안기산；해단백서렬구유전형적Cu2+화Zn2+결합위점,병구유량처Cu/Zn-SOD 단백가족표첨서렬。통과생물신식학분석표명,해단백속우포내Cu/Zn-SOD,이론상대분자질량위15249900,등전점위5.66,무신호태화과막구,추측위친수성단백。동원성분석표명,쌍치위사잠Cu/Zn-SOD안기산서렬여부분연체동물、어류화곤충적Cu/Zn-SOD단백서렬구유흔고적상사성。해연구결과위후속연구Cu/Zn-SOD여배경오염물지간적제량효응관계전정료기출,위연구쌍치위사잠궤체적방어궤제제공료기출자료。
A full length cDNA of Cu/Zn-SOD was firstly cloned in sandworm Perinereis aibuhitensis by homology cloning and RACE techniques based on the partial copper-zinc superoxide dismutase ( Cu/Zn-SOD) gene from pol-ychaete Alitta succinea. The full length of the cDNA was found to be 870 bp including a 156 bp 5′untranslated re-gion,a 261 bp 3′untranslated region and 453 bp open reading frame encoding 150 amino acids. There were typical Cu2+ and Zn2+ binding sites as well as two Cu/Zn-SOD protein family tag sequences in the deduced protein which was within the intracellular Cu/Zn-SOD with relative molecular mass of 15 249 900 and the isoelectric point of 5. 66 by bioinformatic analysis. No signal peptide and transmembrane domain were observed in the deduced pro-tein, indicating that it belonged to the hydrophilic protein. Multiple sequences alignment analysis revealed that the deduced amino acids had high homology to the proteins of partial molluscs, fishes and insects. The findings will provide basis for research of dose-response between gene expression and environmental pollutants, and defense mechanism of the sandworm.