title: Phosphorylation of Ser28 in histone H3 mediated by mixed lineage kinase-like mitogen-activated protein triple kinase alpha.
abstract: The mitogen-activated protein kinase cascades elicit modification of chromatin proteins such as histone H3 by phosphorylation concomitant with gene activation. Here, we demonstrate for the first time that the mixed lineage kinase-like mitogen-activated protein triple kinase (MLTK)-alpha phosphorylates histone H3 at Ser28. MLTK-alpha but neither a kinase-negative mutant of MLTK-alpha nor MLTK-beta interacted with and phosphorylated histone H3 in vivo and in vitro. When overexpressed in 293T or JB6 Cl41 cells, MLTK-alpha phosphorylated histone H3 at Ser28 but not at Ser10. The interaction between MLTK-alpha and histone H3 was enhanced by stimulation with ultraviolet B light (UVB) or epidermal growth factor (EGF), which resulted in the accumulation of MLTK-alpha in the nucleus. UVB- or EGF-induced phosphorylation of histone H3 at Ser28 was not affected by PD 98059, a MEK inhibitor, or SB 202190, a p38 kinase inhibitor, in MLTK-alpha-overexpressing JB6 Cl41 cells. Significantly, UVB- or EGF-induced phosphorylation of histone H3 at Ser28 was blocked by small interfering RNA of MLTK-alpha. The inhibition of histone H3 phosphorylation at Ser28 in the MLTK-alpha knock-down JB6 Cl41 cells was not due to a defect in mitogen- and stress-activated protein kinase 1 or 90-kDa ribosomal S6 kinase (p90RSK) activity. In summary, these results illustrate that MLTK-alpha plays a key role in the UVB- and EGF-induced phosphorylation of histone H3 at Ser28, suggesting that MLTK-alpha might be a new histone H3 kinase at the level of mitogen-activated protein kinase kinase kinases.
authors.affiliation: Hormel Institute, University of Minnesota, Austin, Minnesota 55912, USA.
authors.forename: Hong Seok
authors.initials: HS
authors.lastname: Choi
authors.forename: Bu Young
authors.initials: BY
authors.lastname: Choi
authors.forename: Yong-Yeon
authors.initials: YY
authors.lastname: Cho
authors.forename: Feng
authors.initials: F
authors.lastname: Zhu
authors.forename: Ann M
authors.initials: AM
authors.lastname: Bode
authors.forename: Zigang
authors.initials: Z
authors.lastname: Dong
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D002460:Cell Line; D004791:Enzyme Inhibitors / Q000378:metabolism; D004815:Epidermal Growth Factor / Q000378:metabolism; D005419:Flavonoids / Q000378:metabolism; D017930:Genes, Reporter; D006657:Histones / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007093:Imidazoles / Q000378:metabolism; D020930:MAP Kinase Kinase Kinases / Q000235:genetics / Q000378:metabolism*; D020935:MAP Kinase Signaling System / Q000502:physiology; D051379:Mice; D008969:Molecular Sequence Data; D010766:Phosphorylation; D011725:Pyridines / Q000378:metabolism; D012694:Serine / Q000378:metabolism*; D020798:Two-Hybrid System Techniques; D014466:Ultraviolet Rays
chemical_list: D004791:Enzyme Inhibitors; D005419:Flavonoids; D006657:Histones; D007093:Imidazoles; D011725:Pyridines; D012694:Serine; D004815:Epidermal Growth Factor; D020930:MAP Kinase Kinase Kinases; C428384:MLK-like mitogen-activated protein triple kinase; C090942:4-(4-fluorophenyl)-2-(4-hydroxyphenyl)-5-(4-pyridyl)imidazole; C093973:2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one