Auxin efflux carrier component 8

UniProtKB accession:  Q9LFP6

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UniProtKB description:  Acts as a component of the auxin efflux carrier (PubMed:35768502). Component of the intracellular auxin-transport pathway in the male gametophyte (PubMed:20439545, PubMed:22540348). Involved in the regulation of auxin homeostasis in pollen (PubMed:22540348). Involved in the efflux of auxin from the endoplasmic reticulum into the cytoplasm (PubMed:22760640). Binds auxins including indole-3-acetic acid (IAA), naphthaleneacetic acid (NAA) and the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D), but barely indole-3-butyric acid (IBA) and 2-phenylacetic acid (PAA) (PubMed:35768502). PIN5 and PIN8 may have an antagonistic/compensatory activity (PubMed:22760640, PubMed:22990451). Involved in the control of vein patterning (PubMed:23437008, PubMed:24304505). Redundantly with PIN6, inhibits the vein-formation-promoting functions of PIN5 (PubMed:26560462). PIN5, PIN6, and PIN8 control vein network geometry, but they are expressed in mutually exclusive domains of leaf vascular cells (PubMed:26560462).