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). Negative regulator of guard cell abscisic acid (ABA) signaling, especially during drought stress. Protein modification; protein ubiquitination. Part of a SCF (ASK-cullin-F-box) protein ligase complex (By similarity). Interacts with ASK14 and CUL1. Strongly expressed in guard cells. Mostly represented in seedlings, leaves and flowers, and, to a lower extent, in roots and siliques. Repressed by ABA. The F-box is necessary for the interaction with ASK proteins. Hypersensitive ABA response of stomatal closing and substantial increase of drought tolerance. Sequencing errors.