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J. Biol. Chem., Vol. 277, Issue 33, 29496-29502, August 16, 2002
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§,
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From the Post-translational modification of histones is a
central aspect of gene regulation. Emerging data indicate that
modification at one site can influence modification of a second site.
As one example, histone H3 phosphorylation at serine 10 (Ser10) facilitates acetylation of lysine 14 (Lys14) by Gcn5 in vitro (1, 2). In
vivo, phosphorylation of H3 precedes acetylation at certain
promoters. Whether H3 phosphorylation globally affects acetylation, or
whether it affects all acetylation sites in H3 equally, is not known.
We have taken a genetic approach to this question by mutating
Ser10 in H3 to fix either a negative or a neutral charge at
this position, followed by analysis of the acetylation states of the
mutant histones using site-specific antibodies. Surprisingly, we find
that conversion of Ser10 to glutamate (S10E) or aspartate
(S10D) causes almost complete loss of H3 acetylation at lysine 9 (Lys9) in vivo. Acetylation of Lys9
is also significantly reduced in cells bearing mutations in the Glc7
phosphatase that increase H3 phosphorylation levels. Mutation of
Ser10 in H3 and the concomitant loss of Lys9
acetylation has minimal effects on expression of a
Gcn5-dependent reporter gene. However, synergistic growth
defects are observed upon loss of GCN5 in cells bearing H3
Ser10 mutations that are reminiscent of delays in
G2/M progression caused by combined loss of
GCN5 and acetylation site mutations. Together these results
demonstrate that H3 phosphorylation directly causes site-specific and
opposite changes in acetylation levels of two residues within this
histone, Lys9 and Lys14, and they highlight the
importance of these histone modifications to normal cell functions.
Department of Biochemistry and Molecular
Biology, University of Texas M. D. Anderson Cancer Center, Houston,
Texas 77030 and the ¶ Department of Biochemistry and Molecular
Biology, Louisiana State University Medical Center,
Shreveport, Louisiana 71130
To whom correspondence should be addressed
(previously Sharon Y. Roth): Dept. of Biochemistry and Molecular
Biology, University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Blvd., Houston, TX 77030. Tel.: 713-794-4908; Fax:
713-790-0329; E-mail: syr@mdacc.tmc.edu.
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