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lüll Novel protein-protein interaction family proteins involved in chloroplast movement response Kodama Y; Suetsugu N; Wada MPlant Signal Behav 2011[Apr]; 6 (4): 483-90To optimize photosynthetic activity, chloroplasts change their intracellular location in response to ambient light conditions; chloroplasts move toward low intensity light to maximize light capture, and away from high intensity light to avoid photodamage. Although several proteins have been reported to be involved in the chloroplast photorelocation movement response, any physical interaction among them was not found so far. We recently found a physical interaction between two plant-specific coiled-coil proteins, WEB1 (Weak Chloroplast Movement under Blue Light 1) and PMI2 (Plastid Movement Impaired 2), that were identified to regulate chloroplast movement velocity. Since the both coiled-coil regions of WEB1 and PMI2 were classified into an uncharacterized protein family having DUF827 (DUF: Domain of Unknown Function) domain, it was the first report that DUF827 proteins could mediate protein-protein interaction. In this mini-review article, we discuss regarding molecular function of WEB1 and PMI2, and also define a novel protein family composed of WEB1, PMI2 and WEB1/PMI2-like proteins for protein-protein interaction in land plants.|Arabidopsis Proteins/genetics/metabolism[MESH]|Carrier Proteins/genetics/metabolism[MESH]|Chloroplasts/*metabolism[MESH]|Plant Proteins/genetics/*metabolism[MESH]|Protein Binding[MESH] |