Department of Plant Systems Biology, VIB, 9052 Gent, Belgium.
Trends Plant Sci. 2013 Jan;18(1):5-10. doi: 10.1016/j.tplants.2012.08.009. Epub 2012 Sep 14.
Polarized auxin transport is crucial for many developmental processes in flowering plants and requires the PIN-FORMED (PIN) family of auxin efflux carriers. However, the impact of polar auxin transport and PIN proteins on the development of non-seed plant species and green algal lineages is largely unknown. Using recently available sequence information from streptophyte algae and other non-seed plant species, we have constructed a preliminary phylogenetic framework and present several hypotheses for PIN protein evolution. We postulate that PIN proteins originated in streptophyte algae at the endoplasmic reticulum (ER) and that plasma membrane localization was acquired during land plant evolution. We also suggest that PIN proteins are evolutionarily distinct from another family of auxin transporters at the ER, the PIN-LIKES (PILS) proteins.
极性生长素运输对于开花植物的许多发育过程至关重要，需要 PIN 形成（PIN）家族的生长素外排载体。然而，极性生长素运输和 PIN 蛋白对非种子植物物种和绿藻谱系的发育的影响在很大程度上是未知的。利用最近从石松类藻类和其他非种子植物物种获得的可用序列信息，我们构建了一个初步的系统发育框架，并提出了几个关于 PIN 蛋白进化的假设。我们假设 PIN 蛋白起源于内质网（ER）中的石松类藻类，质膜定位是在陆地植物进化过程中获得的。我们还认为，PIN 蛋白与内质网中的另一种生长素转运蛋白家族 PIN 样蛋白（PILS）在进化上是不同的。
