m-Calpain requires DNA for activity on nuclear proteins at low calcium concentrations.

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m-Calpain requires DNA for activity on nuclear proteins at low calcium concentrations.

m-Calpain (calpain II, m-CANP), which normally requires millimolar Ca2+ for activity in vitro, was capable of proteolyzing a number of matrix proteins in isolated rat liver nuclei at Ca2+ concentrations as low as 3 microM (Mellgren, R. L. (1991) J. Biol. Chem. 266, 13920-13924). Treatment of nuclei with deoxyribonuclease I eliminated the activity of m-calpain at low Ca2+ concentrations, while r...

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Allosteric Activation of Sodium–Calcium Exchange Activity by Calcium: Persistence at Low Calcium Concentrations

The activity of the cardiac Na /Ca 2 exchanger is stimulated allosterically by Ca 2 , but estimates of the half-maximal activating concentration have varied over a wide range. In Chinese hamster ovary cells expressing the cardiac Na /Ca 2 exchanger, the time course of exchange-mediated Ca 2 influx showed a pronounced lag period followed by an acceleration of Ca 2 uptake. Lag periods were absent...

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Proteolysis of Nuclear Proteins by p-Calpain and rn-Calpain"

Purified calpains are capable of proteolyzing several high M, nuclear proteins and solubilizing a histone H1 kinase activity from rat liver nuclei upon exposure to 10"' M Ca2+. Major nuclear substrates displayed apparent molecular masses of 200, 130, 120, and 60 kDa on Coomassie Blue-stained SDS-PAGE gels. The nuclear proteins and the H1 kinase were released from Triton-treated nuclei following...

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Organization of desmosomal plaque proteins in cells growing at low calcium concentrations

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Extraction of nuclear proteins with increased DNA binding activity.

We have developed a method for the rapid extraction of nuclear proteins from cultured cells. The ammonium sulfate method described here extracts larger quantities of proteins that retain DNA binding activity than the modified Dignam method and another popular method used for the extraction of transcription factors. The ammonium sulfate method is rapid and can be used to process a large number o...

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ژورنال

عنوان ژورنال: Journal of Biological Chemistry

سال: 1993

ISSN: 0021-9258

DOI: 10.1016/s0021-9258(18)54201-0