title: Phosphorylation of SU(VAR)3-9 by the chromosomal kinase JIL-1.
abstract: The histone methyltransferase SU(VAR)3-9 plays an important role in the formation of heterochromatin within the eukaryotic nucleus. Several studies have shown that the formation of condensed chromatin is highly regulated during development, suggesting that SU(VAR)3-9's activity is regulated as well. However, no mechanism by which this may be achieved has been reported so far. As we and others had shown previously that the N-terminus of SU(VAR)3-9 plays an important role for its activity, we purified interaction partners from Drosophila embryo nuclear extract using as bait a GST fusion protein containing the SU(VAR)3-9 N-terminus. Among several other proteins known to bind Su(VAR)3-9 we isolated the chromosomal kinase JIL-1 as a strong interactor. We show that SU(VAR)3-9 is a substrate for JIL-1 in vitro as well as in vivo and map the site of phosphorylation. These findings may provide a molecular explanation for the observed genetic interaction between SU(VAR)3-9 and JIL-1.
authors.affiliation: Adolf-Butenandt Institute and Munich Center of Integrated Protein Science (CIPS), Ludwig Maximilians University of Munich, Munich, Germany.
authors.forename: Joern
authors.initials: J
authors.lastname: Boeke
authors.forename: Catherine
authors.initials: C
authors.lastname: Regnard
authors.forename: Weili
authors.initials: W
authors.lastname: Cai
authors.forename: Jørgen
authors.initials: J
authors.lastname: Johansen
authors.forename: Kristen M
authors.initials: KM
authors.lastname: Johansen
authors.forename: Peter B
authors.initials: PB
authors.lastname: Becker
authors.forename: Axel
authors.initials: A
authors.lastname: Imhof
mesh_terms: D000818:Animals; D002460:Cell Line; D029721:Drosophila Proteins / Q000378:metabolism*; D006657:Histones / Q000378:metabolism; D008780:Methyltransferases / Q000378:metabolism*; D009687:Nuclear Proteins / Q000378:metabolism; D010766:Phosphorylation; D011485:Protein Binding; D025941:Protein Interaction Mapping; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*
chemical_list: D029721:Drosophila Proteins; D006657:Histones; D009687:Nuclear Proteins; D008780:Methyltransferases; C445404:SU(VAR)3-9; C507306:JIL-1 protein, Drosophila; D017346:Protein Serine-Threonine Kinases
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