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- W1497366511 abstract "An actin assay which employs the competition between labeled and unlabeled rabbit skeletal muscle actin for DNase I has been developed. Iodination of actin by the method of Bolton and Hunter results in the incorporation of approximately 0.5 mol of 125-iodine/incorporation of approximately 0.5 mol of 125-iodine/mol of actin. This 125I-actin retained the ability to bind to DNase I and inhibit enzymatic activity. The 125I-actin-DNase complex can be precipitated by the addition of a monospecific rabbit antibody to DNase I. The efficiency of this immunoprecipitation step is improved by the use of a second sheep anti-rabbit gamma-globulin. Using this immunoprecipitation assay, there is a linear displacement of the DNase I-bound 125I-actin by rabbit skeletal muscle actin standards or by the actin present in tissue and cell extracts. Using 17.5 ng of DNase I and approximately 500 pg of 125I-actin, 50% inhibition of binding was obtained with 23 ng of unlabeled actin. Reducing the amount of DNase I to 2 ng results in 50% inhibition of binding with 4 ng of unlabeled actin and an increase in the estimated sensitivity of the assay from 1.7 to 0.24 ng. The slopes of the displacement curves generated with both vertebrate and invertebrate non-muscle actins are parallel to rabbit skeletal muscle actin. This observation indicates approximately equal actin-DNase I binding affinities and suggests a high degree of conservation of the actin-DNase I binding site. The assay is useful for measuring the pools of F- and G-actin in a wide range of cells." @default.
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- W1497366511 date "1981-06-01" @default.
- W1497366511 modified "2023-09-27" @default.
- W1497366511 title "A DNase I binding/immunoprecipitation assay for actin." @default.
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- W1497366511 doi "https://doi.org/10.1016/s0021-9258(19)69161-1" @default.
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