New Putative Chloroplast Vesicle Transport Components and Cargo Proteins Revealed Using a Bioinformatics Approach: An Arabidopsis Model
Figure 8
Rab cycling in Arabidopsis chloroplasts.
Rab GTPase in its inactive, Rab-GDP, form is transformed into its active, Rab-GTP, form by an unidentified GEF in the stroma. A GAP promotes activity of the Rab GTPase to perform this action. To function properly the Rab GTPase needs a GDP dissociation inhibitor (GDI) displacement factor (GDF) that catalyzes dissociation of the GDI when bound to the inactive Rab-GDP.