Direct interaction of Ca2+/calmodulin inhibits histone deacetylase 5 repressor core binding to myocyte enhancer factor 2 |
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Authors: | Berger Imre Bieniossek Christoph Schaffitzel Christiane Hassler Markus Santelli Eugenio Richmond Timothy J |
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Institution: | ETH Zürich, Institut für Molekularbiologie und Biophysik, ETH-H?nggerberg, CH-8093 Zürich, Switzerland. |
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Abstract: | 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 Ca(2+) 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 Ca(2+)/calmodulin with HDAC5 inhibiting MEF2a association with this enzyme. |
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