The plant signalling molecule auxin is a key regulator of growth and development; PIN efflux carriers are asymmetrically localized on the plasma membrane and mediate directional auxin transport between cells. Here, an atypical member of the PIN family, PIN5 in Arabidopsis thaliana, is characterized, revealing that it is does not mediate intercellular transport of auxin, but is instead localized to the endoplasmic reticulum, where it presumably regulates intracellular levels of auxin.
- Jozef Mravec
- Petr Skůpa
- Jiří Friml
