Abstract
1. Nuclei were isolated from adult anopheline mosquitoes and fractionated into nucleolar chromatin, nucleoplasmic chromatin and ribonucleoprotein particles by sucrose density gradients. 2. Histones and nonhistone proteins were selectively dissociated from chromatin by treatment with sodium chloride, urea and guanidine HC1. 3. A special class of nonhistone proteins (tight proteins) were extracted from chromatin with Na4P2O7. 4. The electrophoretic properties of the histones, nonhistone proteins and ribonucleoprotein particles were examined by isoelectric focusing and SDS multiphase polyacrylamide gel electrophoresis. 5. By contrast to the histones, the nonhistone proteins displayed considerable heterogeneity. 6. Possible functional implications of the chromosomal proteins are discussed.
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