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过量尿嘧啶胁迫下pyrG对维持构巢曲霉胞内尿嘧啶稳定及正常产孢起关键作用 被引量:1

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摘要 为减少DNA中尿嘧啶的掺入,细胞内尿嘧啶水平受到严格控制,但其机制尚不清楚.构巢曲霉(Aspergillus nidulans)乳清酸核苷5′-磷酸脱羧酶PyrG催化乳清苷酸(OMP)转化为尿苷酸(UMP)的反应,本研究发现,在过量尿嘧啶存在的情况下,PyrG对维持细胞内较低尿嘧啶浓度具有重要作用.与野生菌株相比,过量尿嘧啶及其代谢物对乳清苷酸脱羧酶缺陷的pyrG89突变体具有更强的抑制作用,并能增强pyrG89突变体的有性发育.通过数字基因表达谱(DGE)分析pyrG89突变体和野生菌株对过量尿嘧啶的转录响应,发现尿嘧啶转录激活pyrG89突变体中有性发育相关的基因.HPLC定量分析显示,在过量尿嘧啶存在的情况下,pyrG89突变体胞内尿嘧啶水平是野生菌株的6.5倍.本研究的结果不仅为细胞内尿嘧啶循环及细胞对过量尿嘧啶的适应机制提供了新内容,还揭示了OMP脱羧酶对真菌生长发育存在潜在影响.
出处 《中国科学:生命科学》 CSCD 北大核心 2013年第5期387-396,共10页 Scientia Sinica(Vitae)
基金 国家自然科学基金(批准号:31000551,31170087) 中国科学院“百人计划”资助项目
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