Structural characterization of the jasmonoyl-isoleucine perception complexes from [i]Fragaria vesca[i] by in silico molecular analysis

Background. The phytohormone jasmonates (JAs) regulate fundamental plant processes; such as the anthocyanin accumulation during ripening of strawberry, a non-climacteric fruit model. Jasmonoylisoleucine (JA-Ile), one of the bioactive JA molecules, mediates binding of the JAZ repressor protein to COI1, an F-box protein forming the SCF ubiquitin E3 ligase complex, in Arabidopsis. The COI1-JA-Ile-JAZ complex initiates the JA-signaling pathway leading to early jasmonate responses. Most of Arabidopsis JAZs contain a degron sequence at the Jas domain responsible for interaction with COI1 and JA-Ile. The woodland strawberry (Fragaria vesca) is a model plant for the Rosaceae family, in which the JA-signaling pathway is poorly understood at the molecular level. The aim of this work was to understand the molecular basis of the interaction between the F. vesca COI1 (FvCOI1) and JAZ1 (FvJAZ1) or JAZ8 (FvJAZ8) mediated by JA-Ile.