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To decipher on a molecular level the role of protamine phosphorylation in spermiogenesis, clupeine Z species containing one, two or three serine phosphates were prepared utilizing a recently developed chemical procedure. The melting of complexes with calf thymus DNA showed that thermal stability decreases with increasing degree of phosphorylation. The… (More)
The influence of protamine phosphorylation upon the conformation of nucleoprotamine complexes was studied at different ionic strengths using circular dichroism. The sharp onset of CD spectral changes upon decreasing the NaC1 concentrationwas correlated with the beginning of complex formation and can be used to determine apparent binding affinities in terms… (More)