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相关概念视频

Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

3.3K
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...
3.3K
Structure of Porins01:21

Structure of Porins

3.2K
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
3.2K
Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

4.1K
Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
4.1K
Mitochondrial Membranes01:45

Mitochondrial Membranes

12.3K
A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
12.3K
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

3.2K
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,...
3.2K
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

4.4K
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...
4.4K

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相关实验视频

Updated: Sep 12, 2025

Reconstitution of Msp1 Extraction Activity with Fully Purified Components
05:52

Reconstitution of Msp1 Extraction Activity with Fully Purified Components

Published on: August 10, 2021

2.6K

保存功能,不同的进化:线粒体外膜在真核生物中插入.

Anna Roza Dimogkioka1, Doron Rapaport1

  • 1Interfaculty Institute of Biochemistry, University of Tübingen, Auf der Morgenstelle 34, D-72076 Tübingen, Germany.

Biological chemistry
|August 9, 2025
PubMed
概括
此摘要是机器生成的。

外层线粒体膜 (OMM) 蛋白质插入对于线粒体功能至关重要. 本综述比较了物种间的OMM插入酶,揭示了蛋白向中保存的作用和独特的适应性.

关键词:
这是一个MIM复杂的建筑.在MTCH2中,MTCH2是MTCH2.插入这些东西.线粒体外膜的外膜在pATOM3636中使用.

更多相关视频

Author Spotlight: Unveiling Mitochondrial Contact Sites and Architectural Insights
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Author Spotlight: Unveiling Mitochondrial Contact Sites and Architectural Insights

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Studying Mitochondrial Structure and Function in Drosophila Ovaries
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Studying Mitochondrial Structure and Function in Drosophila Ovaries

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相关实验视频

Last Updated: Sep 12, 2025

Reconstitution of Msp1 Extraction Activity with Fully Purified Components
05:52

Reconstitution of Msp1 Extraction Activity with Fully Purified Components

Published on: August 10, 2021

2.6K
Author Spotlight: Unveiling Mitochondrial Contact Sites and Architectural Insights
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Author Spotlight: Unveiling Mitochondrial Contact Sites and Architectural Insights

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Studying Mitochondrial Structure and Function in Drosophila Ovaries
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Studying Mitochondrial Structure and Function in Drosophila Ovaries

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科学领域:

  • 细胞生物学 细胞生物学
  • 线粒体生物学 线粒体生物学
  • 贩卖蛋白质 贩卖蛋白质 是一个问题.

背景情况:

  • 线粒体功能取决于蛋白质正确向线粒体外膜 (OMM).
  • 称为插入酶的专门生物发生因子调解了α-螺旋式OMM蛋白与疏水性跨膜段的集成.
  • 了解这些插入酶对于理解线粒体蛋白质进口至关重要.

研究的目的:

  • 为了提供对外线粒体膜 (OMM) 插入酶在不同真核细胞系的比较分析.
  • 突出这些必不可少的蛋白质插入因子的保存功能,物种特异性适应和机制细节.

主要方法:

  • 对OMM的比较分析插入各种物种的文献.
  • 对线粒体蛋白质进口机制研究的综述.
  • 检查进化保护和插入的功能分歧.

主要成果:

  • 在酵母中,线粒体进口 (MIM) 复合体 (Mim1/Mim2) 集成OMM蛋白,通常与像Tom20/Tom70.0.这样的受体.
  • 在Trypanosoma brucei中,pATOM36通过融合进化作为一个功能性的MIM对应物.
  • 在哺乳动物中,MTCH2是主要的OMM插酶,MTCH1具有次要作用.

结论:

  • OMM插入物表现出保留的功能,但具有特定物种的适应性.
  • 融合进化形成了具有相似作用的不同的插入酶家族.
  • 对机械细微差别的进一步研究可以阐明线粒体蛋白质生物生成.