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ALG-2 oscillates in subcellular localization, unitemporally with calcium oscillations.

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A variety of stimuli can trigger intracellular calcium oscillations. Relatively little is known about the molecular mechanisms decoding these events. We show that ALG-2, a Ca2+-binding protein originally isolated as a protein associated with apoptosis, is directly linked to Ca2+ signalling. We discovered that the subcellular distribution of a tagged version of ALG-2 could be directed by physiological external stimuli (including ATP, EGF, prostaglandin, histamine), which provoke intracellular Ca2+ oscillations. Cellular stimulation led to a redistribution of ALG-2 from the cytosol to a punctate localization in an oscillatory fashion unitemporally with Ca2+ oscillations, whereas a Ca2+-binding deficient mutant of ALG-2 did not redistribute. Using tagged ALG-2 as bait we identified its novel target protein Sec31A and based on the partial colocalization of endogenous ALG-2 and Sec31A we propose that ALG-2 temporarily binds to the COPII vesicles providing a link between Ca2+ signalling and ER to Golgi trafficking.
Udgivelsesdato: 2007-Feb-23
OriginalsprogEngelsk
TidsskriftBiochemical and Biophysical Research Communications
Vol/bind353
Udgave nummer4
Sider (fra-til)1063-7
Antal sider4
ISSN0006-291X
DOI
StatusUdgivet - 2007

ID: 3137605