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Related Concept Videos

Aquaporins01:25

Aquaporins

5.6K
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.
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Reabsorption and Secretion in the DCT and Collecting Duct01:26

Reabsorption and Secretion in the DCT and Collecting Duct

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The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal...
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Pore Transport and Ion-Pair Transport01:17

Pore Transport and Ion-Pair Transport

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
Pore transport, also known as convective transport, is a process where small molecules like urea, water, and sugars rapidly cross cell membranes as though there were channels or pores in the membrane. Although direct microscopic evidence is limited  but the concept of pores or channels is widely accepted based on physiological evidence. Despite the lack of direct...
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Facilitated Transport01:19

Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Detergent Purification of Membrane Proteins01:18

Detergent Purification of Membrane Proteins

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Sample Preparation using a Lipid Monolayer Method for Electron Crystallographic Studies
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Aquaporins - Expression, purification and characterization.

Roslyn M Bill1, Kristina Hedfalk2

  • 1College of Health and Life Sciences, Aston University, Aston Triangle, Birmingham B4 7ET, UK.

Biochimica Et Biophysica Acta. Biomembranes
|May 21, 2021
PubMed
Summary
This summary is machine-generated.

Recombinant protein technology enables the study of aquaporins, crucial water channels. Successful expression and purification strategies using hosts like E. coli and Pichia pastoris drive breakthroughs in understanding these vital proteins.

Keywords:
AquaporinProteoliposomesRecombinant productionWater channel

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Area of Science:

  • Biochemistry and structural biology
  • Membrane protein research

Background:

  • Aquaporins are essential water channels found across all life forms, facilitating transport across cell membranes.
  • Advances in structural and functional characterization of aquaporins have been significantly driven by the availability of high-quality protein samples.
  • Recombinant protein technology has been pivotal in supplying sufficient quantities of aquaporins for detailed investigation.

Purpose of the Study:

  • To review successful strategies for the expression, purification, and characterization of aquaporins.
  • To highlight methods that have led to breakthroughs in aquaporin research.
  • To provide insights for future advancements in the field.

Main Methods:

  • Utilizing recombinant protein technology for aquaporin sample production.
  • Employing Escherichia coli as a host for prokaryotic aquaporin expression.
  • Using Pichia pastoris as a common host for eukaryotic aquaporin variants.
  • Implementing a two-step purification procedure after solubilization in glucopyranosides.
  • Determining protein structures primarily through X-ray crystallography.

Main Results:

  • Escherichia coli is an effective host for prokaryotic aquaporin isoforms.
  • Pichia pastoris is a widely adopted host for eukaryotic aquaporin variants.
  • A general two-step purification protocol is effective post-solubilization.
  • X-ray crystallography remains a primary method for structural determination.

Conclusions:

  • Optimized expression and purification techniques are critical for aquaporin research.
  • The choice of host organism (E. coli or P. pastoris) depends on the aquaporin type (prokaryotic or eukaryotic).
  • Continued development of these strategies will propel future discoveries in aquaporin function and structure.