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Histone-DNA interactions and their modulation by phosphorylation of -Ser-Pro-X-Lys/Arg- motifs.
Hill CS
,
Rimmer JM
,
Green BN
,
Finch JT
,
Thomas JO
.
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The sea urchin sperm-specific histones H1 and H2B are multiply phosphorylated in spermatids, dephosphorylated in the final stages of spermatogenesis to give mature sperm, and rephosphorylated upon fertilization. Phosphorylation in spermatids, and probably at fertilization, occurs at repeated -Ser-Pro-X-Basic-motifs in the distinctive N-terminal basic domains of both histones and at the end of the much longer C-terminal domain of H1. Here we identify the consequences of multiple phosphorylation through comparison of some physical and biochemical properties of spermatid (phosphorylated) and sperm (dephosphorylated) chromatin and histones. Study of the DNA binding properties of the intact histones and isolated basic domains suggests that phosphorylation at three dispersed sites in the C-terminal tail of H1 has little effect on its overall DNA binding affinity, whereas, strikingly, binding of the N-terminal domains of H2B and H1 is abolished by phosphorylation at four or six tandemly repeated sites respectively. Together with the relative timing of events in vivo, this suggests that phosphorylation/dephosphorylation of the N-terminal (and distal end of the C-terminal) tail of H1, and/or the N-terminal tail of H2B, effectively controls intermolecular interactions between adjacent chromatin filaments, and hence chromatin packing in the spermnucleus.
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