氨酸核酸依赖Ca2+缓冲由线粒体在无机无酸盐介质中的缓冲
Anna B Nikiforova1, Maxim V Molchanov1, Alexey G Kruglov1
1Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Institutskaya 3, Pushchino, Moscow Region 142290, Russia.
Biochimica et biophysica acta. Bioenergetics
|May 28, 2025
概括
氨酸核酸 (AN) 通过水解产生无机酸盐 (Pi),独立于ATP合成酶,从而增强线粒体的保留能力. 这一过程还涉及通过新的机制抑制透性过渡孔 (PTP).
科学领域:
- 线粒体生理学和生物能量学
- 的恒常性稳定 的恒常性稳定
- 细胞生物化学 细胞生物化学
背景情况:
- 无机酸盐 (Pi) 对于线粒体的缓冲非常重要.
- 氨酸核酸 (AN) 显著增加线粒体保留能力 (CRC),即使没有外部Pi.
- 通过AN介导的CRC增强背后的精确机制需要详细的研究.
研究的目的:
- 阐明腺核酸 (AN) 增加线粒体保留能力 (CRC) 在孤立的老鼠肝线粒体中的机制,特别是在缺乏无机酸盐 (Pi) 的情况下.
- 研究F0F1-ATP合成酶,腺酸转位酶和透性过渡孔 (PTP) 在依赖AN的CRC增强中的作用.
- 描述线粒体内酸盐和积的形成和固态度.
主要方法:
- 在孤立的老鼠肝脏线粒体上进行的实验.
- 测量保留能力 (CRC) 和吸收率.
- 利用核磁共振 (NMR) 光谱来检测Pi的形成.
- 采用F0F1-ATP合成酶 (奥利戈米辛),腺酸转位酶和透性过渡孔 (NADH) 的抑制剂.
主要成果:
- 在无Pi介质中,AN剂量取决于CRC的增加.
- 奥利哥米辛对CRC和Ca2+吸收有轻微的抑制作用,NMR证实AN水解产生Pi.
- 线粒体积累了大量的Pi和Ca2+ (比率从0.68到1.25不等),形成酸盐.
- 即使使用F0F1-ATP合成酶和腺酸转位酶的抑制剂,AN也会增加CRC,而没有Pi,NADH不会增强CRC.
结论:
- 在没有Pi的环境中,通过F0F1-ATP合成酶独立的Pi通过水解来增强线粒体CRC.
- 此外,AN还通过与F0F1-ATP合成酶和腺酸转位酶不同的机制抑制透性过渡孔 (PTP).
- 这些发现揭示了由腺核酸调节线粒体的新途径.
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