期刊
PLANT SIGNALING & BEHAVIOR
卷 7, 期 11, 页码 1504-1505出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.21953
关键词
PIN8; PILS5; PIN5; auxin; ER; pollen; transport; homeostasis; Arabidopsis thaliana
资金
- DFG-SFB [592]
- Excellence Initiative of the German Federal and State Governments [EXC 294]
- BundesministeriumfurForschung und Technik (BMBF) [SYSBRA 0315329B]
- DeutschesZentrumfurLuft und Raumfahrt [DLR 50WB1022]
- Freiburg Initiative for Systems Biology (FRISYS)
- European Union Framework 6 Program (AUTOSCREEN) [LSHG-CT-2007-037897]
Cellular auxin homeostasis is controlled at many levels that include auxin biosynthesis, auxin metabolism, and auxin transport. In addition to intercellular auxin transport, auxin homeostasis is modulated by auxin flow through the endoplasmic reticulum (ER). PIN5, a member of the auxin efflux facilitators PIN protein family, was the first protein to be characterized as an intracellular auxin transporter. We demonstrated that PIN8, the closest member of the PIN family to PIN5, represents another ER-residing auxin transporter. PIN8 is specifically expressed in the male gametophyte and is located in the ER. By combining genetic, physiological, cellular and biochemical data we demonstrated a role for PIN8 in intracellular auxin homeostasis. Although our investigation shed light on intracellular auxin transport in pollen, the physiological function of PIN8 still remains to be elucidated. Here we discuss our data taking in consideration other recent findings.
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