Connexin Proteins
Connexin Proteins - Related Videos
09:20
Perturbing Endothelial Biomechanics via Connexin 43 Structural Disruption
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Cited by 6 •
2019
Here, we present a mechanics-based protocol to disrupt the gap junction connexin 43 and measure the subsequent impact this has on endothelial biomechanics via observation of tractions and intercellular stresses.
11:31
Analysis of Protein-protein Interactions and Co-localization Between Components of Gap, Tight, and Adherens Junctions in Murine Mammary Glands
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Cited by 5 •
2017
Intercellular junctions are requisites for mammary gland stage-specific functions and development. This manuscript provides a detailed protocol for the study of protein-protein interactions (PPIs) and co-localization using murine mammary glands. These techniques allow for the investigation of the dynamics of the physical association between intercellular junctions at different developmental stages.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
06:15
Biotinylated Cell-Penetrating Peptide Probe to Detect Protein-Protein Interactions
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2025
This video demonstrates a technique that uses biotinylated cell-penetrating peptides to detect intracellular protein-protein interactions. The cell-penetrating peptides facilitate the conjugated peptide to enter a cell and specifically bind to its interacting proteins. The biotin, after binding to avidin, allows purification of the interacting proteins’ complex from a cell lysate.
06:26
Rapid Assessment of Membrane Protein Quality by Fluorescent Size Exclusion Chromatography
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Cited by 2 •
2023
The present protocol describes a procedure to perform fluorescent size exclusion chromatography (FSEC) on membrane proteins to assess their quality for downstream functional and structural analysis. Representative FSEC results collected for several G-protein coupled receptors (GPCRs) under detergent-solubilized and detergent-free conditions are presented.
FAQs
Assembly occurs in two stages. Six connexin subunits first organize within one membrane to create a connexon, also called a hemichannel. A connexon alone remains undocked, whereas alignment and docking with a connexon in the neighboring cell produces the intercellular gap junction channel. This distinction separates a single-cell membrane structure from a shared cytoplasmic pathway.
Undocked hemichannels provide a signaling state distinct from fully docked gap junctions. The source indicates that they can open under specific conditions and influence cell signaling and membrane behavior. Consequently, connexin activity cannot be interpreted only as cell-to-cell transfer; researchers must also consider effects arising at an individual cell’s membrane when hemichannels are present.
Selective permeability determines which ions and small signaling molecules can move through a channel, while regulated opening controls when that movement occurs. Together, these properties let connexin-mediated communication respond to cellular circumstances rather than remain continuously unrestricted. This control supports coordinated electrical activity and metabolic exchange without implying that every cytoplasmic substance can pass freely.
By allowing ions to pass directly between neighboring cytoplasms, gap junction channels can link the electrical states of cells. This coupling provides a mechanism for coordinated activity across a tissue, rather than requiring each cell to respond in isolation. It is one reason connexin-based communication is biologically important beyond simple molecular exchange.
The source identifies tissue development, metabolic coordination, and responses to injury as major contexts. In development, communication can help coordinate neighboring cells; in metabolism, it supports exchange-related coordination; and after injury, altered communication can contribute to cellular responses. These examples show that the same membrane system can influence normal organization and repair-related behavior.
Changes in connexin expression or mutations can disrupt the communication properties normally provided by these proteins. Because connexins contribute to electrical coupling, metabolic coordination, development, and injury responses, such alterations may have consequences across several tissue functions. Their association with human diseases therefore reflects changes in a communication system with broad biological roles.
Gap junction activity refers to communication through two docked connexons linking adjacent cells, whereas hemichannel activity concerns a connexon that remains undocked in one membrane. The distinction matters when interpreting biological effects: intercellular cytoplasmic transfer points toward a gap junction route, while membrane signaling or behavior may reflect hemichannel involvement.