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2007 ; 11
(5
): 923-34
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The calcium-sensing receptor and its interacting proteins
#MMPMID17979874
Huang C
; Miller RT
J Cell Mol Med
2007[Sep]; 11
(5
): 923-34
PMID17979874
show ga
Seven membrane-spanning, or G protein-coupled receptors were originally thought
to act through het-erotrimeric G proteins that in turn activate intracellular
enzymes or ion channels, creating relatively simple, linear signalling pathways.
Although this basic model remains true in that this family does act via a
relatively small number of G proteins, these signalling systems are considerably
more complex because the receptors interact with or are located near additional
proteins that are often unique to a receptor or subset of receptors. These
additional proteins give receptors their unique signalling personalities. The
extracellular Ca-sensing receptor (CaR) signals via Galpha(i), Galpha(q) and
Galpha(12/13), but its effects in vivo demonstrate that the signalling pathways
controlled by these subunits are not sufficient to explain all its biologic
effects. Additional structural or signalling proteins that interact with the CaR
may explain its behaviour more fully. Although the CaR is less well studied in
this respect than other receptors, several CaR-interacting proteins such as
filamin, a potential scaffolding protein, receptor activity modifying proteins
(RAMPs) and potassium channels may contribute to the unique characteristics of
the CaR. The CaR also appears to interact with additional proteins common to
other G protein-coupled receptors such as arrestins, G protein receptor kinases,
protein kinase C, caveolin and proteins in the ubiquitination pathway. These
proteins probably represent a few initial members of CaR-based signalling
complex. These and other proteins may not all be associated with the CaR in all
tissues, but they form the basis for understanding the complete nature of CaR
signalling.
|Animals
[MESH]
|Contractile Proteins/metabolism
[MESH]
|Filamins
[MESH]
|Humans
[MESH]
|Intracellular Signaling Peptides and Proteins/metabolism
[MESH]