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Related Concept Videos

ABC Transporters: Importer01:27

ABC Transporters: Importer

ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
In bacteria, based on the number of transmembrane helices and the chemical nature of their substrates, the ABC importers can be divided into three types:
Cell Signaling in Plants01:25

Cell Signaling in Plants

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...
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...
Protein Transport to the Outer Chloroplast Membrane01:11

Protein Transport to the Outer Chloroplast Membrane

Chloroplast outer membrane proteins encoded by the nucleus are synthesized in the cytosol. Soon after synthesis, they bind cytosolic factors such as 14-3-3 protein and the Hsp70 chaperones that keep these precursors in an unfolded state until their translocation.
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Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
Protein Transport to the Inner Chloroplast Membrane01:18

Protein Transport to the Inner Chloroplast Membrane

Proteins targeted to the inner chloroplast membrane, or plastid proteins, are transported by two general pathways: the stop-transfer and the re-insertion or post-import pathways. Most plastid proteins carry N-terminal transit sequences and internal import sequences targeting it to the specific chloroplast subcompartment. Proteins targeted by the stop-transfer pathway have internal hydrophobic sequences that inhibit their translocation into the stroma. As a result, these precursors are arrested...

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Related Experiment Video

Updated: May 31, 2026

Translating Ribosome Affinity Purification (TRAP) to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale
09:41

Translating Ribosome Affinity Purification (TRAP) to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale

Published on: May 14, 2020

AUXIN BINDING PROTEIN1: the outsider.

Michael Sauer1, Jürgen Kleine-Vehn

  • 1Department of Plant Molecular Genetics, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas, 28049 Madrid, Spain. msauer@cnb.csic.es

The Plant Cell
|July 2, 2011
PubMed
Summary

Auxin Binding Protein1 (ABP1) is crucial for plant hormone auxin responses, influencing cell expansion and division. Recent findings link ABP1 to plasma membrane events and cytoskeletal control, though its precise function remains under investigation.

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Last Updated: May 31, 2026

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Detection of Protein Interactions in Plant using a Gateway Compatible Bimolecular Fluorescence Complementation (BiFC) System

Published on: September 16, 2011

Area of Science:

  • Plant molecular biology
  • Cellular signaling
  • Plant hormone research

Background:

  • Auxin Binding Protein1 (ABP1) is a well-established auxin-binding protein with a historically implicated role in rapid auxin responses.
  • Previous research highlighted ABP1's involvement in electrophysiological changes, cell expansion, and cell cycle regulation.
  • Recent studies suggest ABP1 also modulates endocytic events and cytoskeletal dynamics at the plasma membrane.

Purpose of the Study:

  • To synthesize recent discoveries regarding ABP1's function with established literature.
  • To identify and discuss unresolved questions surrounding ABP1's molecular mechanisms.
  • To bridge the gap between classical and contemporary understanding of ABP1's role in plant growth.

Main Methods:

  • Literature review and synthesis of existing research on ABP1.
  • Analysis of studies focusing on electrophysiology, cell expansion, cell cycle, and membrane-associated events.
  • Integration of findings from classical and recent experimental data.

Main Results:

  • ABP1's function extends beyond classical roles to include modulation of plasma membrane endocytosis.
  • ABP1 is implicated in RHO OF PLANTS-mediated cytoskeletal rearrangements during asymmetric cell expansion.
  • The precise molecular function of ABP1, particularly at the plasma membrane, remains to be fully elucidated.

Conclusions:

  • ABP1 plays a multifaceted role in plant growth and development, with significant activity at the plasma membrane.
  • Despite decades of research, a comprehensive model of ABP1 action is still lacking.
  • Further investigation is required to fully understand ABP1's molecular mechanisms and its integration into auxin signaling pathways.