通过替代拼接进行神秘的过氧体向,并阻止菌中的代码子读透
Johannes Freitag1, Julia Ast, Michael Bölker
1Department of Biology, Philipps University Marburg, Karl-von-Frisch-Strasse 8, D-35032 Marburg, Germany.
Nature
|May 25, 2012
概括
像GAPDH和PGK这样的糖解酶在真菌的细胞质和过氧体中都存在,影响毒性和氧化还原稳定. 这些酶具有用于双重向的隐藏信号,这表明对蛋白质定位有更广泛的影响.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 菌类学 菌类学是指菌类学.
背景情况:
- 过氧体是重要的真核细胞器官,参与脂肪酸代谢.
- 糖解是一种基本的代谢途径,主要发生在细胞质中.
研究的目的:
- 调查真菌氧体中的糖解酶的存在和向机制.
- 在真菌病原体中确定过氧体糖解酶的功能意义.
主要方法:
- 生物信息分析以识别多氧体向信号 (PTS1).
- 分子生物学技术,包括核糖体读透和替代拼接分析.
- 在Ustilago中进行突变分析可以评估毒性和氧化还原稳定性.
主要成果:
- 核心糖解酶 (GAPDH,PGK) 在各种真菌物种的细胞质和过氧体中都被发现.
- 隐秘的PTS1基因,在转录后被激活,介导过氧体向.
- 特定物种的机制 (核糖体读透,替代拼接) 产生过氧体酶异型.
- 过氧体GAPDH和PGK对于Ustilago可能的毒性至关重要,并有助于氧化还原平衡.
结论:
- 糖解酶对氧体的双重向是真菌中保存的现象.
- 过氧体糖解酶在真菌病原性和细胞平衡中起着重要的作用.
- 发现隐藏的PTS1图案表明,其他细胞质蛋白也可能表现出双定位.
相关概念视频
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Peroxisomal Protein Import:
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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
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There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
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