PuSH - Publikationsserver des Helmholtz Zentrums München: HP1 binds specifically to Lys26-methylated histone H1.4, whereas simultaneous Ser27 phosphorylation blocks HP1 binding.

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Daujat, S.* ; Zeissler, U.* ; Waldmann, T.* ; Happel, N.* ; Schneider, R.*

HP1 binds specifically to Lys26-methylated histone H1.4, whereas simultaneous Ser27 phosphorylation blocks HP1 binding.

J. Biol. Chem. 280, 38090-38095 (2005)

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Open Access Gold möglich sobald Verlagsversion bei der ZB eingereicht worden ist.

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Histone lysine methylation can have positive or negative effects on transcription, depending on the precise methylation site. According to the "histone code" hypothesis these methylation marks can be read by proteins that bind them specifically and then regulate downstream events. Hetero-chromatin protein 1 (HP1), an essential component of heterochromatin, binds specifically to methylated Lys(9) of histone H3 (K9/H3). The linker histone H1.4 is methylated on Lys(26) (K26/H1.4), but the role of this methylation in downstream events remains unknown. Here we identify HP1 as a protein specifically recognizing and binding to methylated K26/H1.4. We demonstrate that the Chromo domain of HP1 is mediating this binding and that phosphorylation of Ser(27) on H1.4 (S27/H1.4) prevents HP1 from binding. We suggest that methylation of K26/H1.4 could have a role in tethering HP1 to chromatin and that this could also explain how HP1 is targeted to those regions of chromatin where it does not colocalize with methylated K9/H3. Our results provide the first experimental evidence for a "phospho switch" model in which neighboring phosphorylation reverts the effect of histone lysine methylation.

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