Related Experiment Video
Updated: Sep 28, 2025
12:18
A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response
Published on: April 17, 2016
10.4K
MAG2 and MAL Regulate Vesicle Trafficking and Auxin Homeostasis With Functional Redundancy
Xiaohui Ma1, Xiaonan Zhao1,2, Hailong Zhang1
1Key Laboratory of Saline-Alkali Vegetation Ecology Restoration, College of Life Sciences, Ministry of Education, Northeast Forestry University, Harbin, China.
Frontiers in Plant Science
|April 4, 2022
Summary
The MAIGO2 (MAG2) complex and its homolog MAL regulate plant development and auxin homeostasis. Their combined function is crucial for membrane trafficking and vesicle transport, impacting plant growth and stress responses.
Area of Science:
- Plant Biology
- Molecular Biology
- Cell Biology
Background:
- Auxin is a key phytohormone regulating plant development and stress responses.
- Auxin homeostasis involves complex regulation of its biosynthesis, catabolism, transport, conjugation, and deposition.
- The Endoplasmic Reticulum (ER)-localized MAIGO2 (MAG2) complex is vital for ER export trafficking.
Purpose of the Study:
- To investigate the regulatory roles of MAG2 and its homolog MAL in plant development and auxin homeostasis.
- To characterize the function of MAG2 and MAL by generating and analyzing a double mutant.
Main Methods:
- Generation and analysis of the mag2-1 mal-1 double mutant.
- Proteomic analysis to identify affected pathways in the double mutant.
- Biochemical and cell biological assays to assess vesicle transport defects.
Main Results:
- The mag2-1 mal-1 double mutant displayed severe developmental defects and altered stress responses compared to single mutants.
- Proteomic analysis revealed significant impacts on signaling, metabolism, stress response, membrane trafficking, and auxin pathways.
- The double mutant exhibited more pronounced vesicle transport defects, altered auxin distribution, and changes in auxin transporter abundance.
Conclusions:
- MAG2 and MAL play redundant roles in regulating plant development and auxin homeostasis.
- These proteins control plant growth and stress adaptation by modulating membrane trafficking processes.
- Understanding MAG2 and MAL function provides insights into auxin transport and plant development regulation.
Related Concept Videos
01:15Receptor Downregulation in MVBs
2.2K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
2.2K
01:33Overview of Secretory Vesicles
8.7K
Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
8.7K
01:19Membrane Asymmetry Regulating Transporters
5.1K
Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
5.1K
01:32Microtubule Associated Motor Proteins
8.6K
Eukaryotic cells have different motor proteins for transporting various cargo within the cell. These motor proteins differ based on the filament they associate with, the direction they move within the cell, and the type of cargo they transport. Motor proteins that associate with microtubules are known as microtubule-associated motor proteins. There are two families of microtubule-associated motor proteins —Kinesins and Dyneins. Both these proteins assist in the transport of cellular...
8.6K
01:38Intralumenal Vesicles and Multivesicular Bodies
3.8K
Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
3.8K
02:23Abnormal Proliferation
4.7K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.7K