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Caspase-mediated cleavage of the stacking protein GRASP65 is required for Golgi fragmentation during apoptosis

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons77707

Barr,  F.
Former Research Groups, Max Planck Institute of Biochemistry, Max Planck Society;

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Zitation

Lane, J. D., Lucocq, J., Pryde, J., Barr, F., Woodman, P. G., Allan, V. J., et al. (2002). Caspase-mediated cleavage of the stacking protein GRASP65 is required for Golgi fragmentation during apoptosis. Journal of Cell Biology, 156(3), 495-509.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0010-6FBE-F
Zusammenfassung
The mammalian Golgi complex is comprised of a ribbon of stacked cisternal membranes often located in the pericentriolar region of the cell. Here, we report that during apoptosis the Golgi ribbon is fragmented into dispersed clusters of tubulo- vesicular membranes. We have found that fragmentation is caspase dependent and identified GRASP65 (Golgi reassembly and stacking protein of 65 kD) as a novel caspase substrate. GRASP65 is cleaved specifically by caspase-3 at conserved sites in its membrane distal COOH terminus at an early stage of the execution phase. Expression of a caspase-resistant form of GRASP65 partially preserved cisternal stacking and inhibited breakdown of the Golgi ribbon in apoptotic cells. Our results suggest that GRASP65 is an important structural component required for maintenance of Golgi apparatus integrity.