Heat Shock Protein 90 Regulates Development inDictyostelium discoideum

Sawarkar, Ritwick and Roy, Nainita and Rao, Sanjana and Raman, Swetha and Venketesh, S and Suguna, K and Tatu, Utpal (2008) Heat Shock Protein 90 Regulates Development inDictyostelium discoideum. In: Journal of Molecular Biology, 383 (1). pp. 24-35.

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Abstract

Cytosolic heat shock protein 90 (Hsp90) has been implicated in diverse biological processes such as protein folding, cell cycle control, signal transduction, development, and morphological evolution. Model systems available for studying Hsp90 function either allow ease of manipulation for biochemical studies or facilitate a phenomenological study of its role in influencing phenotype. In this work, we have explored the use of the cellular slime mold Dictyostelium discoideum to examine cellular functions of Hsp90 in relation to its multicellular development. In addition to cloning, purification, biochemical characterization, and examination of its crystal structure, our studies, using a pharmacological inhibitor of Hsp90,demonstrate a role for the cytoplasmic isoform (HspD) in D. discoideum development. Inhibition of HspD function using geldanamycin (GA) resulted in delayed aggregation and arrest of D. discoideum development at the ‘mound’ stage. Crystal structure of the amino-terminal domain of HspD showed a binding pocket similar to that described for yeast Hsp90. Fluorescence spectroscopy, as well as GA-coupled beads affinity pulldown, confirmed a specific interaction between HspD and GA. The results presented here provide an important insight into the function of HspD in D. discoideum development and emphasize the potential of the cellular slime mold to serve as an effective model for studying the many roles of Hsp90 at cellular and organismal levels.

Item Type:	Journal Article
Publication:	Journal of Molecular Biology
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Hsp90; Dictyostelium; morphogenesis; geldanamycin; mound arrest.
Department/Centre:	Division of Biological Sciences > Molecular Reproduction, Development & Genetics
Date Deposited:	23 Jul 2009 10:56
Last Modified:	19 Sep 2010 04:52
URI:	http://eprints.iisc.ac.in/id/eprint/16559

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