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Related Experiment Video

Updated: Oct 21, 2025

Author Spotlight: A High-Resolution, Single-Grain, In Vivo Pollen Hydration Bioassay for Arabidopsis thaliana
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Structural Basis for Silicic Acid Uptake by Higher Plants.

Bert van den Berg1, Conrado Pedebos2, Jani R Bolla3

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Summary
This summary is machine-generated.

Researchers revealed the structure of a key protein, silicon channel OsNIP2;1, crucial for silicon uptake in crops like rice. This finding advances understanding of plant growth and crop yield enhancement.

Keywords:
NIP channelX-ray crystal structureaquaporinmolecular dynamicssilicic acid transport

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Area of Science:

  • Plant Biology
  • Biochemistry
  • Structural Biology

Background:

  • Silicon (Si) accumulation in crops like rice, barley, and maize enhances growth and yield.
  • Root uptake of silicic acid, mediated by NIP subfamily aquaporins (metalloid porins), is the initial step in Si accumulation.
  • The structure and function of these metalloid porins remain largely uncharacterized.

Purpose of the Study:

  • To determine the X-ray crystal structure of the archetypal NIP family member from Oryza sativa (OsNIP2;1).
  • To elucidate the structural basis for silicic acid transport and channel gating in metalloid porins.
  • To provide insights into the substrate selectivity of these essential plant transporters.

Main Methods:

  • X-ray crystallography was used to determine the high-resolution structure of OsNIP2;1.
  • Molecular dynamics simulations were employed to study channel dynamics and substrate interaction.
  • Structural analysis focused on the cytoplasmic loop D and the extracellular selectivity filter.

Main Results:

  • The crystal structure of OsNIP2;1 reveals that the channel is closed by cytoplasmic loop D.
  • A novel, wide-diameter, five-residue extracellular selectivity filter was identified.
  • Molecular dynamics simulations demonstrated rapid channel opening and visualized silicic acid interaction with the filter.

Conclusions:

  • The determined structure of OsNIP2;1 provides a foundation for understanding metalloid porin function.
  • The findings enable detailed structure-function studies of silicon transport in plants.
  • This research paves the way for engineering crops with improved silicon uptake and enhanced resilience.