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- W1536744395 abstract "Abstract In this study the spin-label method has been used to obtain information about conformational properties of regions containing cysteine of histone H3 from calf thymus, histone H4 from sperm of the sea urchin Arbacia lixula, and the histone complex H3–H4. It has been found that the microenvironments of histone H3 causing immobilization of the spin labels are sensitive to variations in ionic strength of dilute solutions of phosphate buffer, are partially destroyed by urea, and fully destroyed by proteolytic enzymes. The interaction of spin-labeled histone H3 with histone H4 induces an increase of immobilization of the spin label, indicating an increase in rigidity at the cysteine region of histone H3. The use of a series of spin labels of variable length for histone H3 gives an estimate of 0.8–1.0 nm for the apparent depth of the spin label binding site, a value which does not change upon interaction of histone H3 with H4. Histone H4 from A. lixula sperm causes a similar immobilization of the spin label. As for histone H3, immobilization increases with the ionic strength, and the structures are destroyed by urea and proteolytic enzymes. Upon mixing with histone H3, however, the extent of immobilization appears only slightly changed, and together with sedimentation velocity results, these studies suggest that the spin label attached to histone H4 prevents the complex formation." @default.
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- W1536744395 date "1977-10-01" @default.
- W1536744395 modified "2023-09-25" @default.
- W1536744395 title "Electron spin resonance studies on the conformation and interactions of histones containing cysteine" @default.
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- W1536744395 doi "https://doi.org/10.1016/0003-9861(77)90375-7" @default.
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