Heat shock protein 90 regulates development in Dictyostelium discoideum.
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.
Sawarkar
Ritwick
R
Molecular Reproduction, Development, and Genetics, Indian Institute of Science, Bangalore 560 012, India.
Roy
Nainita
N
Rao
Sanjana
S
Raman
Swetha
S
Venketesh
S
S
Suguna
K
K
Tatu
Utpal
U
D000251:Adenosine Triphosphatases / Q000235:genetics / Q000378:metabolism; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D016227:Benzoquinones / Q000494:pharmacology; D001665:Binding Sites; D003001:Cloning, Molecular; D003460:Crystallization; D016054:DNA, Protozoan / Q000235:genetics; D004023:Dictyostelium / Q000187:drug effects / Q000235:genetics / Q000254:growth & development* / Q000378:metabolism*; D017125:Genes, Protozoan; D018841:HSP90 Heat-Shock Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D007700:Kinetics; D047029:Lactams, Macrocyclic / Q000494:pharmacology; D008958:Models, Molecular; D010641:Phenotype; D020033:Protein Isoforms / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D017434:Protein Structure, Tertiary; D015800:Protozoan Proteins / Q000037:antagonists & inhibitors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D011994:Recombinant Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D029701:Saccharomyces cerevisiae Proteins / Q000037:antagonists & inhibitors / Q000378:metabolism; D013045:Species Specificity
D016227:Benzoquinones; D016054:DNA, Protozoan; C074510:HSP82 protein, S cerevisiae; D018841:HSP90 Heat-Shock Proteins; D047029:Lactams, Macrocyclic; D020033:Protein Isoforms; D015800:Protozoan Proteins; D011994:Recombinant Proteins; D029701:Saccharomyces cerevisiae Proteins; D000255:Adenosine Triphosphate; D000251:Adenosine Triphosphatases; C001277:geldanamycin