Individual lysine acetylations on the N terminus of Saccharomyces cerevisiae H2A.Z are highly but not differentially regulated.
The multi-functional histone variant Htz1 (Saccharomyces cerevisiae H2A.Z) is acetylated on up to four N-terminal lysines at positions 3, 8, 10, and 14. It has thus been posited that specific acetylated forms of the histone could regulate distinct roles. Antibodies against Htz1-K8(Ac), -K10(Ac), and -K14(Ac) show that all three modifications are added by Esa1 acetyltransferase and removed by Hda1 deacetylase. Completely unacetylatable htz1 alleles exhibit widespread interactions in genome scale genetic screening. However, singly mutated (e.g. htz1-K8R) or singly acetylable (e.g. the triple mutant htz1-K3R/K10R/K14R) alleles show no significant defects in these analyses. This suggests that the N-terminal acetylations on Htz1 are internally redundant. Further supporting this proposal, each acetylation decays with similar kinetics when Htz1 transcription is repressed, and proteomic screening did not find a single condition in which one Htz1(Ac) was differentially regulated. However, whereas the individual acetylations on Htz1 may be redundant, they are not dispensable. Completely unacetylatable htz1 alleles display genetic interactions and phenotypes in common with and distinct from htz1Δ. In addition, each Htz1 N-terminal lysine is deacetylated by Hda1 in response to benomyl and reacetylated when this agent is removed. Such active regulation suggests that acetylation plays a significant role in Htz1 function.
Mehta
Monika
M
Department of Cell Biology, Albert Einstein College of Medicine, Bronx, New York 10461, USA.
Braberg
Hannes
H
Wang
Shuyi
S
Lozsa
Anita
A
Shales
Michael
M
Solache
Alejandra
A
Krogan
Nevan J
NJ
Keogh
Michael-Christopher
MC
D000107:Acetylation / Q000187:drug effects; D000483:Alleles; D019943:Amino Acid Substitution; D000906:Antibodies / Q000737:chemistry; D001542:Benomyl / Q000494:pharmacology; D005659:Fungicides, Industrial / Q000494:pharmacology; D055106:Genome-Wide Association Study; D051548:Histone Acetyltransferases / Q000235:genetics / Q000378:metabolism; D006655:Histone Deacetylases / Q000235:genetics / Q000378:metabolism; D006657:Histones / Q000235:genetics / Q000378:metabolism*; D008239:Lysine / Q000235:genetics / Q000378:metabolism*; D020125:Mutation, Missense; D017434:Protein Structure, Tertiary; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic / Q000502:physiology
D000906:Antibodies; D005659:Fungicides, Industrial; D006657:Histones; C493530:Htz1 protein, S cerevisiae; D029701:Saccharomyces cerevisiae Proteins; C496551:Esa1 protein, S cerevisiae; D051548:Histone Acetyltransferases; C499673:HDA1 protein, S cerevisiae; D006655:Histone Deacetylases; D008239:Lysine; D001542:Benomyl