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Molecular organization of gap junction membrane channels
1Department of Neurosciences, University of California, San Diego, La Jolla 92093-0322, USA.
Journal of Bioenergetics and Biomembranes
|August 1, 1996
Summary
Gap junctions form channels connecting cells, unique in their structure and protein composition (connexins). This review explores connexin structure, channel packing, and functional diversity, impacting cell communication.
Area of Science:
- Cell Biology
- Structural Biology
- Biophysics
Background:
- Gap junctions are crucial intercellular communication channels.
- They are formed by connexin proteins and exhibit unique structural properties.
- Understanding their structure is key to understanding cell function.
Purpose of the Study:
- To review the molecular structure of gap junction channels and hemichannels.
- To discuss the packing of intercellular channels into arrays.
- To explore how different connexins form channels with distinct physiological properties.
Main Methods:
- Literature review focusing on structural aspects of gap junctions.
- Analysis of existing data on connexin protein structure and assembly.
- Discussion of physiological implications derived from structural studies.
Main Results:
- Gap junction channels span two cell membranes and form tightly packed arrays.
- Connexins assemble into channels with diverse physiological properties.
- Structural variations influence channel function and cellular communication.
Conclusions:
- The review highlights the intricate molecular and array structure of gap junctions.
- Connexin diversity leads to varied channel functions.
- Structural insights are vital for understanding gap junction roles in physiology.