Related Experiment Video
Updated: Nov 11, 2025
09:01
Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria
Published on: January 7, 2022
2.8K
Mitochondrial quality control: from molecule to organelle
Alba Roca-Portoles1,2, Stephen W G Tait3
1Institute of Cancer Sciences, Cancer Research UK Beatson Institute, University of Glasgow, Switchback Road, Glasgow, G61 1BD, UK. alba.roca@cbm.csic.es.
Cellular and Molecular Life Sciences : CMLS
|March 30, 2021
Summary
Mitochondria maintain cell health through quality control pathways like mito-nuclear communication, fission/fusion, and mitophagy. Dysregulation of these mitochondrial processes is linked to diseases such as cancer and neurodegeneration.
Area of Science:
- Cell Biology
- Molecular Biology
- Pathology
Background:
- Mitochondria are vital organelles involved in numerous cellular functions.
- Maintaining mitochondrial homeostasis is essential for overall cellular health.
- Mitochondrial quality control pathways are critical for cellular function.
Purpose of the Study:
- To review the molecular and organelle-level processes that maintain mitochondrial health.
- To explore the mechanisms of mito-nuclear communication and mitochondrial dynamics.
- To discuss the link between mitochondrial dysfunction and human diseases.
Main Methods:
- Literature review of mitochondrial quality control mechanisms.
- Analysis of molecular signaling pathways involved in mitochondrial homeostasis.
- Examination of mitochondrial dynamics (fission and fusion) and degradation (mitophagy).
Main Results:
- Mitochondria actively sense and respond to homeostatic imbalances via mito-nuclear signaling.
- Mitochondria can dynamically alter morphology through fission and fusion in response to stimuli.
- Mitophagy serves as a crucial degradation pathway for damaged mitochondria.
Conclusions:
- Proper functioning of mitochondrial quality control pathways is indispensable for cellular homeostasis.
- Alterations in mitochondrial quality control are implicated in the pathogenesis of neurodegenerative diseases and cancer.
Related Concept Videos
01:19Translocation of Proteins into the Mitochondria
9.8K
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,...
9.8K
01:39Mitochondrial Protein Sorting
5.1K
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...
5.1K
01:45Mitochondrial Membranes
14.6K
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,...
14.6K
01:39Mitochondrial Precursor Proteins
3.2K
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...
3.2K
01:37Mitochondria
17.3K
Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...
17.3K
01:28The Inner Mitochondrial Membrane
4.0K
The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria. In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
4.0K