Abstract
The accumulation and utilization of storage proteins are prominent events linked to the metamorphosis of holometabolous insects. Storage proteins are synthesized in fat body, secreted into the larval hemolymph and taken up by fat body shortly before pupation. Within the pupal fat body, these proteins are initially stored in protein granules, and later proteolytically broken down to supply amino acid resources necessary for the completion of adult development. Most, but not all storage proteins belong to a superfamily of hexameric larval serum proteins that are evolutionarily related to hemocyanin. This article reviews the classification of these proteins, based on their amino acid sequences, and the current knowledge of the receptors that mediate their selective uptake into pupal fat body.
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