Function:Component of heterochromatin. Recognizes and binds histone H3 tails methylated at 'Lys-9' , leading to epigenetic repression. Interaction with lamin B receptor (LBR) can contribute to the association of the heterochromatin with the inner nuclear membrane. ,online information:Heterochromatin protein 1 entry ,PTM:Not phosphorylated. ,similarity:Contains 2 chromo domains. ,subcellular location:Unassociated with chromosomes during mitosis. ,subunit:Homodimer. Interacts directly with CHAF1A , EMSY , LBR , TIF1/TIF1A and TRIM28/TIF1B PXVXL motif via the chromoshadow domain. Interacts directly with histone H3 methylated at 'Lys-9' via the chromo domain. Interacts with SUV39H1 and SETDB1 , SUV420H1 and SUV420H2. Interacts with PRDM6. ,tissue specificity:In all adult and embryonic tissues. ,
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