Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 278, Issue 20, Pages 17625-17635Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M301646200
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Myocyte enhancer factor 2 (MEF2) proteins play a pivotal role in the differentiation of cardiac and skeletal muscle cells. MEF2 factors are regulated by histone deacetylase enzymes such as histone deacetylase 5 (HDAC5). HDAC5 in turn is responsive to Ca2+ signaling mediated by the intracellular calcium sensor calmodulin. Here a combination of proteolytic fragmentation, matrix-assisted laser desorption ionization mass spectrometry, Edman degradation, circular dichroism, gel filtration, and surface plasmon resonance studies is utilized to define and characterize a stable core domain of HDAC5 and to examine its interactions with MEF2a and calmodulin. Results from real time binding experiments provide evidence for direct interaction of Ca2+/calmodulin with HDAC5 inhibiting MEF2a association with this enzyme.
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