Related Experiment Video
Updated: May 5, 2026
08:39
Tracking Single Proteins in Lipid Bilayers Using Fluorescence Microscopy
Published on: December 12, 2025
1.1K
Unraveling aquaporin interaction partners.
Jennie Sjöhamn1, Kristina Hedfalk1
1Department of Chemistry and Molecular Biology, University of Gothenburg, P.O. Box 462, SE-405 30 Göteborg, Sweden.
Biochimica Et Biophysica Acta
|November 21, 2013
Summary
Understanding protein-protein interactions (PPIs) is crucial for cell physiology. This review details methods for studying aquaporin (AQP) interactions, highlighting diverse partners and the C-terminus role.
Area of Science:
- Biochemistry and Molecular Biology
- Cellular Physiology
- Structural Biology
Background:
- Understanding protein-protein interactions (PPIs) is essential for elucidating cellular event physiology.
- Studying eukaryotic membrane proteins presents significant challenges in production, purification, and structural determination.
- Aquaporins (AQPs) are a key focus for investigating membrane protein interactions.
Purpose of the Study:
- To explore common strategies for identifying medically relevant interaction partners of aquaporins (AQPs).
- To describe established methods for detecting direct protein-protein contacts.
- To highlight interactions found for specific aquaporin targets (AQP0, AQP2, AQP4, AQP5).
Main Methods:
- Yeast two-hybrid interaction assay for detecting direct protein contacts.
- Co-precipitation techniques to identify interacting proteins.
- Bimolecular fluorescence complementation (BiFC) for screening transient interactions.
Main Results:
- The majority of identified interactions involve the C-terminus of aquaporins.
- Interaction partners of aquaporins exhibit diverse characteristics.
- Established PPI methods are robust, with BiFC offering advantages for screening.
Conclusions:
- Insights from human aquaporin research can advance integral membrane protein studies.
- Structural evaluation of protein complexes is key for understanding molecular communication.
- Method development in PPI studies is critical for advancing biological understanding.
Keywords:
AquaporinCo-precipitationMembrane proteinProtein–protein interactionYeast two-hybrid interaction assayMore Related Videos
Related Concept Videos
01:25Aquaporins
5.0K
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.
5.0K
01:17Pore Transport and Ion-Pair Transport
1.6K
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...
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...
1.6K
01:09Multi-pass Transmembrane Proteins and β-barrels
4.4K
In multi-pass transmembrane proteins, the polypeptide chain crosses the membrane more than once. The transmembrane polypeptide chain either forms an α-helix or β-strand structure. α-Helix containing multi-pass transmembrane proteins are ubiquitous, whereas β-strand containing ones are mainly found in gram-negative bacteria, mitochondria, and chloroplasts.
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
α-Helix containing multi-pass transmembrane proteins
Multi-pass transmembrane proteins such as...
4.4K
01:19Membrane Asymmetry Regulating Transporters
6.1K
Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
Flippase
Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
6.1K
01:45Endocrine Signaling
53.7K
Endocrine cells produce hormones to communicate with remote target cells found in other organs. The hormone reaches these distant areas using the circulatory system. This exposes the whole organism to the hormone but only those cells expressing hormone receptors or target cells are affected. Thus, endocrine signaling induces slow responses from its target cells but these effects also last longer.
53.7K
01:21Structure of Porins
3.1K
Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
3.1K