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• W2063524501 abstract "The present study examines changes in specific proteins during insect development. The investigation explores the careers of individual proteins, their specific activities, rates of synthesis, and when and where they are made and transported. Quantitative disk electropherograms of protein patterns in blood, fat body, wings, antennae, epidermis, gut, ovaries and egg, Malpighian tubules, and silk glands of the Hyalophora cecropia silkworm are examined for the late fifth-instar larva, two stages when the animal spins the cocoon, diapausing pupa, pharate adult, and the emerged adult.The separation of proteins with acrylamide gel electrophoresis, densitometric evaluation of stained bands, and the incorporation of radioactive precursors into the specific bands furnish excellent tools for examining and evaluating the macromolecules, and immunodiffusion detects the complexities of electrophoretic protein bands.The total soluble protein per unit weight is highest in blood, followed in decreasing amounts in fat body, wing, and epidermis. However, the capacity to synthesize proteins is found to be highest in the epidermis, followed by wing, antennae, midgut, ovaries and eggs, and fat body, respectively. All the larval and adult tissues show lower concentrations of proteins than the pharate adult. The peak protein concentration in each tissue is attained at a different physiological and chronological stage of development, and is often followed by marked morphological changes.The number of electrophoretically separable bands varies extensively in each tissue and stage of development, e.g., blood contains 8–16, fat body 2–16, epidermis 4→20, wings 5–20, antennae 3–12, gut has as many as 40, ovaries and eggs 8–12, Malpighian tubules 3–7, and silk glands 2–10. Qualitatively, some proteins from one tissue differ from others. The blood serves as a fluid transport medium for proteins released into it and removed from it, e.g., larval blood proteins, sequestered by pupal fat body, and a wing protein are released into it, whereas one is taken up by ovaries in the pharate adult.According to the dye-binding capacity, the protein bands are arbitrarily assigned to two groups, major and minor protein bands. Four major bands, RF's 20, 25, 32, and 40, are separated using a 5 per cent gel concentration. The pattern of quantitative changes in each of the major bands is presented for the entire period of development in different tissues. Of numerous minor bands, few are typical of a tissue and specific stage of development. Their role and relationship to physiological events are discussed.On the basis of whether a protein band incorporates isotope precursor or not, synthetically active and inactive proteins are separated. Employing computations of specific activity, the rates of synthesis, degradation, transport, etc., are determined for a specific protein. The limitations of different techniques are discussed with possible solutions." @default.
• W2063524501 created "2016-06-24" @default.
• W2063524501 creator A5046041737 @default.
• W2063524501 date "1971-12-01" @default.
• W2063524501 modified "2023-09-27" @default.
• W2063524501 title "Protein synthesis during insect development" @default.
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• W2063524501 doi "https://doi.org/10.1016/0020-1790(71)90004-7" @default.
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