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Related Concept Videos

Aquaporins01:25

Aquaporins

Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
Structure-Activity Relationships and Drug Design01:28

Structure-Activity Relationships and Drug Design

Drug design is a dynamic field that involves discovering and developing new medications based on specific biological targets. This process heavily relies on structure-activity relationships (SAR) and quantitative structure-activity relationships (QSAR) to guide the design and optimization of efficient drugs.
SAR studies the intricate relationship between a drug's chemical structure and biological activity. It focuses on understanding how modifications to a drug's structure can influence its...
The ADP/ATP Carrier Protein01:42

The ADP/ATP Carrier Protein

ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
Protein Organization01:24

Protein Organization

Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
Protein Organization01:13

Protein Organization

Overview
Protein and Protein Structure02:15

Protein and Protein Structure

Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...

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Related Experiment Video

Updated: Jun 27, 2026

Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy
08:39

Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy

Published on: December 12, 2025

The AQP structure and functional implications.

Thomas Walz1, Yoshinori Fujiyoshi, Andreas Engel

  • 1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

Handbook of Experimental Pharmacology
|December 20, 2008
PubMed
Summary
This summary is machine-generated.

Structural insights into aquaporins (AQPs) enhance understanding of water and solute transport. Further research is needed to fully explain AQP regulation and gas permeation mechanisms.

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Area of Science:

  • Biophysics
  • Structural Biology
  • Membrane Protein Research

Background:

  • Aquaporins (AQPs) are integral membrane proteins crucial for water and solute transport across cell membranes.
  • Significant progress in determining AQP structures has advanced our comprehension of their transport functions.
  • Existing structural data facilitates detailed analysis of water and proton transport mechanisms.

Purpose of the Study:

  • To leverage current structural and simulation data to analyze AQP function.
  • To identify knowledge gaps in understanding AQP-mediated gas permeation and regulatory mechanisms.
  • To highlight the necessity for continued structural and molecular dynamics studies.

Main Methods:

  • Atomic structure determination of aquaporins.
  • Molecular dynamics simulations to monitor water and proton permeation.
  • Site-directed mutagenesis to assess water and solute transport.

Main Results:

  • Atomic structures enable detailed monitoring of water permeation and proton exclusion via simulations.
  • Structural data provides a foundation for analyzing transport with site-directed mutations.
  • Current understanding of AQP regulation and gas permeation remains incomplete.

Conclusions:

  • Structural biology and molecular dynamics have greatly advanced the understanding of AQP water and solute transport.
  • Further investigations are essential to fully elucidate the mechanisms governing AQP regulation and gas permeation.
  • Deciphering these remaining processes will provide a comprehensive view of aquaporin functionality.