线粒体蛋白酶PARL是精子生成所需的
Sarah Schumacher1, Laura Klose2, Jessica Lambertz2
1Institute of Neuroanatomy, Medical Faculty, University of Bonn, 53115, Bonn, Germany. s.schumacher@uni-bonn.de.
Communications biology
|January 5, 2024
概括
线粒体蛋白酶PARL的缺乏会阻止男性半径变化I的进展. 这会损害复杂IV,ATP和的合成,影响男性生育能力.
科学领域:
- 线粒体生物学 线粒体生物学
- 男性生殖生理学 男生殖生理学
- 分子内分泌学分子内分泌学
背景情况:
- 线粒体功能对男性生育能力至关重要,但线粒体缺陷相关不孕症的机制尚未完全理解.
- 线粒体蛋白酶,如PARL,对于维持线粒体平衡至关重要.
研究的目的:
- 研究PARL在男性精子生成和生育能力中的作用.
- 阐明PARL缺乏影响丸功能的分子机制.
主要方法:
- 产生和分析缺乏PARL的小鼠 (Parl-/-).
- 评估精子生成,线粒体功能 (呼吸链复合体IV活性,ATP产生),类固醇生成 (HSD17B3,) 和丸中的荷尔蒙调节 (LH).
- 在不同器官中对PARL缺陷影响的比较分析.
主要成果:
- 帕尔缺乏症导致精子生成在介质变化I过程中完全停止.
- 对Parl-/-小鼠的测试显示,呼吸链复杂IV蛋白的严重下调,活性降低,ATP产生减少,这是其他器官没有观察到的缺陷.
- 帕尔-/-丸显示HSD17B3的几乎完全丧失,破坏了的合成,导致LH上调和改变了LH调节的反应.
结论:
- 帕尔对于男性半月变化I的进展和维持丸线粒体功能和的合成至关重要.
- 线粒体缺陷,如PARL缺陷,可以以特定细胞类型的方式表现,通过复杂的下游调节途径影响男性生育能力.
- 这些发现强调了线粒体健康,类固醇生成和男性生殖中的荷尔蒙平衡之间的关键相互作用.
相关概念视频
Spermatogenesis
102.5K
Spermatogenesis is the process by which haploid sperm cells are produced in the male testes. It starts with stem cells located close to the outer rim of seminiferous tubules. These spermatogonial stem cells divide asymmetrically to give rise to additional stem cells (meaning that these structures “self-renew”), as well as sperm progenitors, called spermatocytes. Importantly, this method of asymmetric mitotic division maintains a population of spermatogonial stem cells in the male...
102.5K
Mitochondrial Protein Sorting
4.3K
Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
4.3K
Mitochondrial Precursor Proteins
2.6K
Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
Most of the mitochondrial...
2.6K
Translocation of Proteins into the Mitochondria
3.1K
Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
3.1K
ATP Synthase: Mechanism
14.6K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
14.6K
Porin Insertion in the Outer Mitochondrial Membrane
3.0K
Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
3.0K


