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Related Concept Videos

The Significance of Membrane Transport01:44

The Significance of Membrane Transport

The transport of solutes across the cell membrane is essential for metabolic processes, like maintaining cell size and volume, generating the action potential, exchanging nutrients and gases, etc. Membrane transport can be either passive or active. It can be simple diffusion, facilitated, or mediated transport aided by transport proteins such as transporters and channels.
Transporters facilitate either an active or passive movement of solutes. They can allow a single-molecule transport down its...
Carrier-Mediated Transport01:06

Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
Membrane Transporters01:31

Membrane Transporters

Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
Transporters are mainly composed of alpha-helices, built from bundles of ten or more helices traversing the plasma membrane. The solute-binding sites are located midway, where some of the helices are broken or distorted, making space for the binding site through...
Active Transport01:14

Active Transport

Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
ABC Transporters: Exporter01:31

ABC Transporters: Exporter

ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
Facilitated Diffusion01:16

Facilitated Diffusion

The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
In this process, substrates such as organic compounds and ions interact with a transporter on one side, triggering conformational changes in proteins that enable...

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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles
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Evaluating the function of putative hormone transporters.

Wolf B Frommer1, Burkhard Schulz, Angus S Murphy

  • 1Department of Plant Biology, Carnegie Institution for Science, Stanford, California 94305, USA. wfrommer@stanford.edu

Plant Signaling & Behavior
|August 4, 2009
PubMed
Summary

Understanding plant hormone transport is crucial for deciphering cell-to-cell communication. Kinetic and specificity studies are key to identifying hormone transporters, advancing our knowledge of plant signaling.

Keywords:
adeninekinetinphytohormonetransportzeatin

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Area of Science:

  • Plant biology
  • Molecular biology
  • Biochemistry

Background:

  • Plant hormones act as long-distance signals, necessitating transport systems for their movement.
  • Hormone transport mechanisms, including auxin and cytokinin transport, remain incompletely understood.
  • Identifying specific transporters and understanding their properties are vital for advancing plant hormone research.

Discussion:

  • Physiological transport data are essential for identifying and characterizing candidate hormone transporters.
  • Kinetic and substrate specificity studies provide a foundation for discovering novel transport systems.
  • Characterizing transporter properties helps define their in vivo roles in plant development and signaling.

Key Insights:

  • Kinetic and specificity studies are powerful tools for identifying plant hormone transporters.
  • Understanding hormone transport is critical for plant growth and response to environmental cues.
  • This research highlights a pathway for discovering cytokinin transporters.

Outlook:

  • Further research into hormone transport systems will elucidate complex plant signaling networks.
  • Identifying and characterizing more transporters will enable precise manipulation of hormone levels.
  • This approach can be applied to discover transporters for other essential plant hormones.