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悦目金蛛葡萄状腺丝蛋白重复模块特征与进化分析
发表时间:2012-09-15 浏览量:1419 下载量:644
全部作者: | 张云龙,汤淼,尹郅祺,韦平,李欣 |
作者单位: | 东华大学化学化工与生物工程学院 |
摘 要: | 为寻找蜘蛛丝的分子进化证据,对葡萄状腺丝蛋白(aciniform spidroin 1,AcSp1)基因重复区进行克隆与进化分析。基于悦目金蛛(Argiope amoena)葡萄状腺cDNA文库和STS(sequence tagged site)/3D-PCR筛选技术,获取了AcSp1基因3 216 bp,其包含6个高度同源(99%以上)长串联重复模块(long tandem repeat module,LTR),均编码215个氨基酸,且富含丝氨酸(Ser),高于甘氨酸(Gly)和丙氨酸(Ala),这种LTR与典型蛛丝蛋白(如拖丝蛋白)的短串联重复模块(short tandem repeat module,STR)截然不同,但却发现与已报道的古老猛蛛亚目(2.4亿年前)蛛丝蛋白LTR更为同源,且属同一进化分支。这表明新蛛(1.25亿年前)AcSp1相对于其他蛛丝蛋白在进化上更加接近进化源(即古蛛蛛丝蛋白),推测蜘蛛丝生态功能分化起始于“护卵”作用。 |
关 键 词: | 生物化学;蜘蛛丝蛋白;葡萄状腺丝蛋白;串联重复模块;基因克隆;分子进化 |
Title: | Characterization and evolution analysis of aciniform spidroin repeat module from Argiope amoena |
Author: | ZHANG Yunlong, TANG Miao, YIN Zhiqi, WEI Ping, LI Xin |
Organization: | College of Chemistry, Chemical Engineering and Biotechnology, Donghua University |
Abstract: | In order to search for evidences of molecular evolution of the spider silk, the paper performs cloning and evolution analysis for aciniform spidroin 1 (AcSp1) coding genetic repetitive regions. It gains the AcSp1 gene 3 216 bp based on the aciniform silk gland cDNA library from Argiope amoena and STS (sequence tagged site)/3D-PCR genetic screening technology. It contains six highly conserved (more than 99%) long tandem repeat module (LTR) coded 215 amino acids, which are rich in Serine (Ser), higher than glycine (Gly) and alanine (Ala). It is found that AcSp1 from A. amoena is completely different from typical short tandem repeat module (STR) silk protein (such as drag silk protein), but high homology with LTR modules from the archaeic Mygalomorph (240 millions of years ago) spidroins belong to a same evolutionary branch. These results show that AcSp1 (Araneomorphs, 125 millions of years ago) was closed to the evolution source (namely ancient spider silk protein) compared with other kinds of spiders, which speculated that differentiation of spider silk ecological function originated from “protect eggs” role. |
Key words: | biochemistry; spider silk protein; aciniform spidroin; tandem repeat module; gene cloning; molecular evolution |
发表期数: | 2012年9月第17期 |
引用格式: | 张云龙,汤淼,尹郅祺,等. 悦目金蛛葡萄状腺丝蛋白重复模块特征与进化分析[J]. 中国科技论文在线精品论文,2012,5(17):1621-1628. |

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