Abstract:
:The organization of intra-Golgi trafficking and the nature of the transport intermediates involved (e.g., vesicles, tubules, or tubular continuities) remain incompletely understood. It was recently shown that successive cisternae in the Golgi stack are interconnected by membrane tubules that form during the arrival of transport carriers from the endoplasmic reticulum. Here, we examine the mechanisms of generation and the function of these tubules. In principle, tubule formation might depend on several protein- and/or lipid-based mechanisms. Among the latter, we have studied the phospholipase A(2) (PLA(2))-mediated generation of wedge-shaped lysolipids, with the resulting local positive membrane curvature. We show that the arrival of cargo at the Golgi complex induces the recruitment of Group IVA Ca(2+)-dependent, cytosolic PLA(2) (cPLA(2)alpha) onto the Golgi complex itself, and that this cPLA(2)alpha is required for the formation of the traffic-dependent intercisternal tubules and for intra-Golgi transport. In contrast, silencing of cPLA(2)alpha has no inhibitory effects on peri-Golgi vesicles. These findings identify cPLA(2)alpha as the first component of the machinery that is responsible for the formation of intercisternal tubular continuities and support a role for these continuities in transport through the Golgi complex.
journal_name
PLoS Bioljournal_title
PLoS biologyauthors
San Pietro E,Capestrano M,Polishchuk EV,DiPentima A,Trucco A,Zizza P,Mariggiò S,Pulvirenti T,Sallese M,Tete S,Mironov AA,Leslie CC,Corda D,Luini A,Polishchuk RSdoi
10.1371/journal.pbio.1000194subject
Has Abstractpub_date
2009-09-01 00:00:00pages
e1000194issue
9eissn
1544-9173issn
1545-7885journal_volume
7pub_type
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