Table 1.
Examples for the involvement of PP2A (PP1) in vesicle traffic of plant cells. See text for more details.
| Subunit Involved | Change of Protein Phosphatase Activity or Other PP2A Related Functions | Target Protein | Function | References |
|---|---|---|---|---|
| PP2A/C | activation | MAP65-1 MAP65-3? | Bundling of MTs, indirect regulation of vesicle traffic | [9,30] |
| PP2A/C | activation | AMPK, activation | Blocking of TORC pathway, triggering of autophagy | [56] |
| TAP46 subunit of PP2A | activation | proteins of the TORC pathway | Triggering of the TORC pathway and blocking of autophagy pathway | [4,51] |
| Methylation of PP2A/C by SBI1 | SBI1 targets PP2A to BRI1 containing endosomes | BRI1 | Dephosphorylation of excess BRI1 that will be targeted to lytic vacuoles | [4,62] |
| PP2A/B’, C | inhibition/deactivation | BZR1 | BZR1 remains phosphorylated, thus targeted to the autophagy pathway | [65,100] |
| PP2A/A, C3, C4, PP1 | activation | PINs, dephosphorylation | PIN recycling and proper membrane localization. Polar transport-tissue distribution of auxins | [69,70,76,87,98] |
AMPK—AMP-activated Ser kinase; BRI1—brassinosteroid (BR) receptor; BZR1—BR induced transcription factor; SBI1—leucine carboxymethylase.