Active Site Metal Identity Alters Histone Deacetylase 8 Substrate Selectivity: A Potential Novel Regulatory Mechanism

Carol Ann Castaneda, Jeffrey E. Lopez, Caleb G. Joseph, Michael D. Scholle, Milan Mrksich*, Carol A. Fierke

*Corresponding author for this work

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Histone deacetylase 8 (HDAC8) is a well-characterized member of the class I acetyl-lysine deacetylase (HDAC) family. Previous work has shown that the efficiency of HDAC8-catalyzed deacetylation of a methylcoumarin peptide varies depending on the identity of the divalent metal ion in the HDAC8 active site. Here we demonstrate that both HDAC8 activity and substrate selectivity for a diverse range of peptide substrates depend on the identity of the active site metal ion. Varied deacetylase activities of Fe(II)- and Zn(II)-HDAC8 toward an array of peptide substrates were identified using self-assembled monolayers for matrix-assisted laser desorption ionization (SAMDI) mass spectrometry. Subsequently, the metal dependence of deacetylation of peptides of biological interest was measured using an in vitro peptide assay. While Fe(II)-HDAC8 is generally more active than Zn(II)-HDAC8, the Fe(II)/Zn(II) HDAC8 activity ratio varies widely (from 2 to 150) among the peptides tested. These data provide support for the hypothesis that HDAC8 may undergo metal switching in vivo that, in turn, may regulate its activity. However, future studies are needed to explore the identity of the metal ion bound to HDAC8 in cells under varied conditions.

Original languageEnglish (US)
Pages (from-to)5663-5670
Number of pages8
JournalBiochemistry
Volume56
Issue number42
DOIs
StatePublished - Oct 24 2017

ASJC Scopus subject areas

  • Biochemistry

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