Journal
COLD SPRING HARBOR PERSPECTIVES IN BIOLOGY
Volume 11, Issue 4, Pages -Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1101/cshperspect.a035063
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Funding
- Biotechnology and Biological Sciences Research Council UK [BB/P005330/1]
- Wellcome Trust [101844]
- BBSRC [BB/P005330/1] Funding Source: UKRI
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Inositol 1,4,5-trisphosphate receptors (IP(3)Rs), by releasing Ca2+ from the endoplasmic reticulum (ER) of animal cells, allow Ca2+ to be redistributed from the ER to the cytosol or other organelles, and they initiate store-operated Ca2+ entry (SOCE). For all three IP3R subtypes, binding of IP3 primes them to bind Ca2+, which then triggers channel opening. We are now close to understanding the structural basis of IP3R activation. Ca2+-induced Ca2+ release regulated by IP3 allows IP(3)Rs to regeneratively propagate Ca2+ signals. The smallest of these regenerative events is a Ca2+ puff, which arises from the nearly simultaneous opening of a small cluster of IP(3)Rs. Ca2+ puffs are the basic building blocks for all IP3-evoked Ca2+ signals, but only some IP3 clusters, namely those parked alongside the ER-plasma membrane junctions where SOCE occurs, are licensed to respond. The location of these licensed IP(3)Rs may allow them to selectively regulate SOCE.
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