Location of the globular region in chicken erythrocyte histone H5.

Chicken erythrocyte histone H5 has been cleaved by acetic acid hydrolysis at the two aspartic acid residues 65 and 99 and the 4 peptides (1-65), (66-185) (1-99) (100-185) recovered in a pure form. 270 MHz magnetic resonance and circular dichroic studies show that the two C-terminal peptides are unable to form secondary or tertiary structure. The N-terminal peptides however, form both secondary and tertiary structure. In particular, the peptide (1-99) at high ionic strength possesses a similar number of helical residues to intact histone H5 and also had a closely related nuclear magnetic resonance spectrum. It is concluded that the peptide (1-99) contains most, but not quite all of the residues that are included in the globular segment of histone H5.