FIG 3 .

Structures of homologs to ethylene receptors identified in early diverging fungi. (A) Diversity of structures found in various early diverging fungi. The structures of several previously characterized ethylene receptors from plant, green algae, and cyanobacteria are also provided (20). (B) Alignment of ethylene binding domains from homologs to ethylene receptors identified in early diverging fungi, along with others from plant, algae, and cyanobacteria. The ethylene binding domains consist of three transmembrane helices. Essential residues that have been reported to be involved in ethylene perception (18) are indicated with red arrows. AMAG_07677 and PaETR1 sequences were not included in this analysis (incomplete ethylene binding domain). The amino acid sequence alignment was formatted with the JALVIEW program.