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Fig. 6. Location and putative function of m-Rab_mc in plant cells. The compartment marked by BP80, m-Rab_mc and the calcium ATPase ACA4 is named the secretory prevacuolar compartment (PVC_s). The location of m-Rab_mc on the PVC, its partial association with the GA and its function in aleurain transport to the lytic vacuole suggest an involvement in GA/PVC trafficking. m-Rab_mc might regulate the transport of vacuolar proteins from the GA to the PVC (1) that in turn would fuse with the lytic vacuole (LV) to deliver cargo and presumably tonoplast proteins (2). Dotted arrows with open arrowheads indicate a putative recycling event of m-Rab_mc between the GA and the prevacuolar compartment. Ara6, the A. thaliana homologue of m-Rab_mc, has been assigned to FM4-64-labelled sub-micron structures called endosomes (Ueda et al., 2001) (3). These structures are named endocytic prevacuolar compartments (PVC_e) in this model. The broken double-headed arrow respects the possibility that the PVC_s and PVC_e may be the same compartment.

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