Commentary: Plant Auxin Biosynthesis Did Not Originate in Charophytes.

Chunyang Wang,Guan-Zhu Han,Si-Shen Li

doi:10.3389/fpls.2016.00158

Abstract

Commentary: Plant Auxin Biosynthesis Did Not Originate in Charophytes.

Highlights

The TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS (TAA) family of aminotransferases and the YUCCA (YUC) family of flavin monooxygenases are required for the biosynthesis of auxin (Mashiguchi et al, 2011)
We found TAA and YUC protein homologs in the genome of Klebsormidium flaccidum, a charophyte alga, and proposed that plant auxin biosynthesis might originate in charophytes (Wang et al, 2014)
Missing bacteria and archaea homologs leads to the absence of outgroup taxa to root the TAA phylogenetic tree (Figure 1A)

Summary

Introduction

The TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS (TAA) family of aminotransferases and the YUCCA (YUC) family of flavin monooxygenases are required for the biosynthesis of auxin (Mashiguchi et al, 2011). We found TAA and YUC protein homologs in the genome of Klebsormidium flaccidum, a charophyte alga, and proposed that plant auxin biosynthesis might originate in charophytes (Wang et al, 2014). Turnaev et al (2015) reanalyzed the structures and phylogenetic relationship of TAA family proteins and claimed K. flaccidum TAA-like protein (kfl00051_0080) is more closely related to alliinases than tryptophan aminotransferases.

Results

Conclusion