Heat Shock Protein 90 Regulates Development in Dictyostelium discoideum

• Published in: Journal of molecular biology 2008-10, Vol.383 (1), p.24-35
• Main Authors: Sawarkar, Ritwick, Roy, Nainita, Rao, Sanjana, Raman, Swetha, Venketesh, S., Suguna, K., Tatu, Utpal
• Format: Article
• Language: English
• Subjects: Adenosine Triphosphatases - genetics; Adenosine Triphosphatases - metabolism; Adenosine Triphosphate - metabolism; Animals; Benzoquinones - pharmacology; Binding Sites; Cloning, Molecular; Crystallization; Dictyostelium; Dictyostelium - drug effects; Dictyostelium - genetics; Dictyostelium - growth & development; Dictyostelium - metabolism; Dictyostelium discoideum; DNA, Protozoan - genetics; geldanamycin; Genes, Protozoan; Hsp90; HSP90 Heat-Shock Proteins - antagonists & inhibitors; HSP90 Heat-Shock Proteins - chemistry; HSP90 Heat-Shock Proteins - genetics; HSP90 Heat-Shock Proteins - metabolism; Kinetics; Lactams, Macrocyclic - pharmacology; Models, Molecular; morphogenesis; mound arrest; Phenotype; Protein Isoforms - antagonists & inhibitors; Protein Isoforms - chemistry; Protein Isoforms - genetics; Protein Isoforms - metabolism; Protein Structure, Tertiary; Protozoan Proteins - antagonists & inhibitors; Protozoan Proteins - chemistry; Protozoan Proteins - genetics; Protozoan Proteins - metabolism; Recombinant Proteins - chemistry; Recombinant Proteins - genetics; Recombinant Proteins - metabolism; Saccharomyces cerevisiae Proteins - antagonists & inhibitors; Saccharomyces cerevisiae Proteins - metabolism; Species Specificity
• ISSN: 0022-2836; 1089-8638
• DOI: 10.1016/j.jmb.2008.08.006

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.