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[Abstract] This rapid protocol allows the extraction of chloroplast enriched proteins from Nicotiana benthamiana (N. benthamiana) leaves that were transiently transformed to express an epitope tagged protein of interest. Thus, it can serve as a tool to study the chloroplastidic localization of the protein of interest when it is combined with western-blot analysis. Agrobacterium-mediated transformation (Agroinfiltration, Romeis et al., 2001) is used to transiently express a protein carrying an epitope tag in tobacco leaves. Here, co-infiltration with an Agrobacterium strain harboring 19 K from soil-borne wheat mosaic virus suppresses posttranscriptional gene silencing and therefore increases transformation efficiency (Te et al., 2005). The chloroplast isolation of the transformed leaves is based with modifications on Romeis et al. (2001), and includes mechanical breakage of cell wall and membranes, the removal of unbroken tissue by filtration and the separation of intact chloroplasts by centrifugation through a Percoll layer.

Extraction of Chloroplast Proteins from Transiently Transformed Nicotiana benthamiana Leaves