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- W2017702076 abstract "The secondary structure of the calf thymus core histone octamer, (H2A-H2B-H3-H4)2, and its two physiological subunits, the H2A-H2B dimer and (H3-H4)2 tetramer, was analyzed by ORD spectropolarimetry as a function of temperature and solvent ionic strength within the ranges of these experimental parameters where assembly of the core histone octamer exhibits pronounced sensitivity. While the secondary structure of the dimer is relatively stable from 0.1 to 2.0 M NaCl, the secondary structure of the tetramer exhibits complex changes over this range of NaCl concentrations. Both complexes exhibit only modest responses to temperature changes. ORD spectra of very high and very low concentrations of stoichiometric mixtures of the core histones revealed no evidence of changes in the ordered structure of the histones as a result of the octamer assembly process at NaCl concentrations above 0.67 M, nor were time-dependent changes detected in the secondary structure of tetramer dissolved in low ionic strength solvent. The secondary structure of the chicken erythrocyte octamer dissolved in high concentrations of ammonium sulfate, including those of our crystallization conditions, was found to be essentially unchanged from that in 2 M NaCl when examined by both ORD and CD spectropolarimetry. The two well-defined cleaved products of the H2A-H2B dimer, cH2A-H2B and cH2A-cH2B, exhibited reduced amounts of ordered structure; in the case of the doubly cleaved moiety cH2A-cH2B, the reductions were so pronounced as to suggest marked structural rearrangements." @default.
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- W2017702076 date "1990-01-30" @default.
- W2017702076 modified "2023-10-16" @default.
- W2017702076 title "Spectropolarimetric analysis of the core histone octamer and its subunits" @default.
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- W2017702076 doi "https://doi.org/10.1021/bi00456a018" @default.
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