利用蛋白组学分析挖掘酿酒酵母环境胁迫耐性相关新功能基因

来源 :第七届全国微生物资源学术暨国际微生物系统与分类学研讨会 | 被引量 : 0次 | 上传用户:loverbeyond
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  在燃料乙醇发酵生产中,酿酒酵母受到多种胁迫条件的影响,包括高浓度乙醇、原料水解液中的乙酸以及高温等,选育具有良好胁迫耐受性的酿酒酵母能够加快生长速度,提高乙醇产率,缩短发酵周期.本课题组前期研究发现,锌添加可提高酵母的乙酸胁迫耐受性[1-3],在蛋白组学分析中发现若干蛋白,包括一些未知功能蛋白的表达明显上调.本文对其中两个蛋白的编码基因GRX5以及一个未知功能的氧化还原酶基因进行了进一步研究,结果表明,过表达GRX5菌株在含有5 g·L-1乙酸的平板中生长优于对照菌株;在含有5 g·L-1乙酸的培养基中进行乙醇发酵,过表达GRX5菌株可在48 h基本消耗培养基中所有的葡萄糖,发酵周期比对照菌株缩短了24 h,且在对数期超氧化物歧化酶(SOD),谷胱甘肽过氧化物酶(GSH-PX)及过氧化氢酶(CAT)等抗氧化酶的酶活明显提高.过表达GRX5也可提高酿酒酵母在42℃高温及1.0 M NaCl胁迫条件下的生长.未知功能氧化还原酶基因的过表达也得到类似的结果,证明该基因是酿酒酵母环境胁迫耐性相关的新功能基因,目前正在对其提高耐性的机理进行深入研究.对酵母细胞环境响应机制及耐性相关功能基因的挖掘,可为进一步探究胁迫耐受性机制,选育高效工业酿酒酵母菌种,提高乙醇发酵效率奠定基础.
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