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Heat shock of Drosophila melanogaster induces the synthesis of new messenger RNAs and proteins.

The heat shock proteins, labelled in vivo with [35S]methionine, were separated by sodium dodecylsulphate-polyacrylamide gel electrophoresis and fingerprinted after tryptic digestion. Eight distinct heat shock polypeptides are characterized in this way. Heat shock messenger RNAs were isolated and partially purified. Assayed in vitro for protein synthesis, they were found to code for heat shock polypeptides. Some parameters of the kinetics of in vivo synthesis of the heat shock proteins are presented.