Repressor of jasmonate responses. Jasmonoyl-isoleucine (JA-Ile) specifically promotes COI1-TIFY7/JAZ9 interaction (PubMed:19151223). Interacts with and suppresses RHD6 and RSL1 transcription factor activities to negatively regulate jasmonate-stimulated root hair development (PubMed:31988260). Homo- and heterodimer. Interacts with MYC2, MYC3, MYC4, COI1, AFPH2/NINJA, TIFY10A/JAZ1, TIFY10B/JAZ2, TIFY6B/JAZ3, TIFY5A/JAZ8, TIFY9/JAZ10 and TIFY3A/JAZ11 (PubMed:18547396, PubMed:19151223, PubMed:19309455, PubMed:20360743, PubMed:21321051, PubMed:23169619). Interacts with RHD6 and RSL1 (PubMed:31988260). Up-regulated by jasmonate, wounding and herbivory. The jas domain (220-244) is necessary and sufficient for interaction with COI1. Ubiquitinated. Targeted for degradation by the SCF(COI1) E3 ubiquitin ligase-proteasome pathway during jasmonate signaling. Belongs to the TIFY/JAZ family. Truncated N-terminus.