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Genomics and Cellular Biology

Vacuoles are a large single-membrane-bound compartment within the cytoplasm of a cell. Vacuoles can be very large (80% or more of the cell volume), often occupy a central position in the cell and are extremely important in providing structural support, as well as serving functions such as storage, waste disposal, protection, and growth. Vacuolar proteins are generally synthesized at the rough ER and reach the vacuoles by vesicular transport. In embryophytes the biogenesis of vacuoles is further complicated by the presence of two different types of vacuoles in many if not all cell types. In recent years many components of the molecular machinery required for protein trafficking to vacuoles in plant cells has been identified. In my presentation I will summarize our current understanding of protein trafficking to the vacuolar system in green algae and present a hypothesis to explain the evolutionary origin of the plant vacuolar system.