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SPX2 | SPX domain-containing protein 2; May inhibit PHR1 DNA-binding activity in a Pi-dependent manner. (287 aa) | ||||
SPX1 | SPX domain-containing protein 1; Plays a positive role in plant adaptation to phosphate starvation. Inhibits PHR1 DNA-binding activity in a Pi-dependent manner. (256 aa) | ||||
PHO1 | Phosphate transporter PHO1; Inositol polyphosphate sensor that associates with transcription factors to regulate inorganic phosphate (Pi) starvation responses. Probably acts by binding inositol polyphosphate via its SPX domain. Acts as a Pi exporter, mediating efflux of Pi out of cells. Transfers Pi from the epidermal and cortical cells to the root xylem vessels. Involved in the transfer of Pi from roots to shoots. Involved in abscisic acid (ABA) induction of stomatal closure and ABA repression of stomatal opening. Belongs to the SYG1 (TC 2.A.94) family. (782 aa) | ||||
UBC24 | Probable ubiquitin-conjugating enzyme E2 24; Accepts the ubiquitin from the E1 complex and catalyzes its covalent attachment to other proteins (By similarity). Mediates PHO1 degradation through multivesicular body-mediated vacuolar proteolysis in response to inorganic phosphate (Pi) availability. Negatively regulates the protein abundance of PHF1 and PHT1s under Pi- sufficient conditions by facilitating the degradation of PHT1 proteins at the endomembrane. (907 aa) |