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Am J Physiol Cell Physiol (January 21, 2009). doi:10.1152/ajpcell.00488.2008 Free Article
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Submitted on September 26, 2008
Revised on December 5, 2008
Accepted on January 18, 2009

INSIGHTS INTO THE RESIDENCE IN LIPID RAFTS OF ADENYLYL CYCLASE AC8 AND ITS REGULATION BY CAPACITATIVE CALCIUM ENTRY

mario pagano1, michael john clynes1, nanako masada1, antonio ciruela1, laura-jo ayling1, sebastian wachten1, and dermot mf cooper1*

1 University of Cmbridge

* To whom correspondence should be addressed. E-mail: dmfc2{at}cam.ac.uk.

Adenylyl cyclases (ACs) are a family of critically important signalling molecules that are regulated by multiple pathways. Adenylyl cyclase 8 (AC8) is a Ca2+ stimulated isoform that displays a selective regulation by capacitative Ca2+ entry (CCE), the process whereby the entry of Ca2+ into cells is triggered by the emptying of intracellular stores. This selectivity was believed to be achieved through the localization of AC8 in lipid raft microdomains, along with components of the CCE apparatus. In the present study, we show that an intact leucine zipper motif is required for the efficient N-linked glycosylation of AC8, and that this N-linked glycosylation is important to target AC8 into lipid rafts. Disruption of the leucine zipper by site-directed mutagenesis results in the elimination of N-glycosylated forms and their exclusion from lipid rafts. Mutants of AC8 that cannot be N-glycosylated are not demonstrably associated with rafts, although they can still be regulated by CCE; however, raft integrity is required for the regulation of these mutants. These findings suggest that raft localized proteins in addition to AC8 are needed to mediate its regulation by CCE.







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