Auxin efflux carrier component 1

UniProtKB accession:  Q9C6B8

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UniProtKB description:  Acts as a component of the auxin efflux carrier; this activity is enhanced when activated by D6PK-mediated phosphorylation (PubMed:35917925). Binds auxins including indole-3-acetic acid (IAA), indole-3-butyric acid (IBA), indole-3-propionic acid (IPA) and 4-chloroindole-3-acetic acid (4-Cl-IAA) (PubMed:35917925). Seems to be involved in the basipetal auxin transport. Mediates the formation of auxin gradient which is required to ensure correct organogenesis. Coordinated polar localization of PIN1 is directly regulated by the vesicle trafficking process and apical-basal PIN1 polarity also depends on the phosphorylation of conserved serine residues by PID kinase. The ARF-GEF protein GNOM is required for the correct recycling of PIN1 between the plasma membrane and endosomal compartments. Recrutes NPY proteins (e.g. NPY1/MAB4 and NPY5/MEL1) to the plasma membrane in a polar basal localization in root epidermis; this activity is optimized by AGC kinases-mediated (e.g. D6PK and PID) phosphorylation that limits their lateral diffusion-based escape (PubMed:33705718).