Component of SCF(ASK-cullin-F-box) E3 ubiquitin ligase complexes, which may mediate the ubiquitination and subsequent proteasomal degradation of target proteins (By similarity). Regulates negatively both salicylic acid (SA)-dependent and SA-independent defense signaling. Protein modification; protein ubiquitination. Part of a SCF (ASK-cullin-F-box) protein ligase complex (By similarity). Interacts with SKP1A/ASK1, SPK1B/ASK2, ASK9, ASK10, ASK11, ASK13, ASK14, ASK16, ASK17, ASK18 and ASK19. Interacts with TRAF1B (PubMed:26867179). Expressed in seedling, root, stem, leaves, inflorescence and silique, especially in veins and trichomes. The F-box is necessary for the interaction with ASK proteins. Temperature dependent; normal at high temperature (above 28 degrees Celsius), but in colder temperature, dwarf morphology, constitutive resistance to the bacterial pathogen Pseudomonas syringae, and induction of defense-response gene expression such as PR-30.