Related Experiment Video
Updated: Jun 19, 2025
12:18
A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response
Published on: April 17, 2016
10.3K
ABLs and transmembrane kinases shape extracellular auxin perception
Saumya Jaiswal1, Durgesh Kumar Tripathi2, Yiming Wang3
1Plant Physiology Laboratory, Department of Botany, Chaudhary Mahadeo Prasad (C.M.P.) Degree College, a Constituent Postgraduate College of the University of Allahabad, Prayagraj, Uttar Pradesh 211002, India.
Trends in Plant Science
|July 24, 2024
Summary
Researchers discovered new proteins, ABL1 and ABL2, that help plants perceive auxin in the apoplast. This finding reveals a novel mechanism for extracellular auxin signaling, independent of the known ABP1 pathway.
Area of Science:
- Plant biology
- Molecular signaling
- Biochemistry
Background:
- Auxin is a critical plant hormone regulating growth and development.
- The precise mechanisms of apoplastic auxin perception remain largely unknown.
- Auxin-binding protein 1 (ABP1) has been implicated in auxin signaling.
Purpose of the Study:
- To elucidate the molecular players involved in apoplastic auxin perception.
- To investigate novel pathways for extracellular auxin signaling.
- To understand the role of ABP1-like proteins in auxin perception.
Main Methods:
- Identification and characterization of novel apoplast-localized proteins.
- Analysis of protein-protein interactions between these novel proteins and transmembrane kinases (TMKs).
- Investigating the functional role of these interactions in auxin perception.
Main Results:
- Two novel apoplast-localized auxin-binding protein 1 (ABP1)-like proteins, ABL1 and ABL2, were identified.
- ABL1 and ABL2 interact with transmembrane kinases (TMKs).
- This interaction mediates extracellular auxin perception in an ABP1-independent manner.
Conclusions:
- ABL1 and ABL2 represent key components of a novel apoplastic auxin perception system.
- Extracellular auxin perception involves both ABP1-dependent and ABP1-independent pathways.
- The ABL1/ABL2-TMK complex provides a new target for understanding auxin signaling.
Related Concept Videos
01:25Cell Signaling in Plants
5.6K
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
5.6K
01:56Plant Hormones
23.7K
Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.
23.7K
01:45Endocrine Signaling
64.2K
Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
64.2K
02:12Short-distance Transport of Resources
15.9K
Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
15.9K
01:19Interactions Between Signaling Pathways
6.3K
Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
6.3K
01:22Amplifying Signals via Enzymatic Cascade
8.4K
When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze...
8.4K