Involved in jasmonate (JA) signaling. Required for jasmonate signaling in plant defense responses (By similarity). Component of SCF(COI1) E3 ubiquitin ligase complexes, which may mediate the ubiquitination and subsequent proteasomal degradation of target proteins, including TIFY/JAZ family (By similarity). Interacts with TIFY9/JAZ5, TIFY11C/JAZ11 AND TIFY11D/JAZ12 in a coronatine-dependent manner. Expressed in roots, shoots, leaf sheaths and leaf blades.