Required for the chloroplast avoidance response under high intensity blue light. This avoidance response consists in the relocation of chloroplasts on the anticlinal side of exposed cells. Acts in association with WEB1 to maintain the velocity of chloroplast photorelocation movement via cp-actin filaments regulation. Interacts with WEB1. Ubiquitous but preferentially in chloroplast-containing tissues. Deficient chloroplast response. Belongs to the WEB family.