4XKK

Crystal structure of N-terminal domain of Hsp90 from Dictyostelium discoideum

Summary for 4XKK

• Entry DOI: 10.2210/pdb4xkk/pdb
• Descriptor: Heat shock cognate 90 kDa protein (2 entities in total)
• Functional Keywords: hsp90, chaperone, dictyostelium discoideum
• Biological source: Dictyostelium discoideum (Slime mold)
• Cellular location: Cytoplasm : P54651
• Total number of polymer chains: 1
• Total formula weight: 29226.87

Authors

Raman, S.,Suguna, K. (deposition date: 2015-01-12, release date: 2015-01-28, Last modification date: 2023-11-08)

Primary citation

Sawarkar, R.,Roy, N.,Rao, S.,Raman, S.,Venketesh, S.,Suguna, K.,Tatu, U.
Heat shock protein 90 regulates development in Dictyostelium discoideum
J. Mol. Biol., 383:24-35, 2008

PubMed 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.

PubMed: 18718841
DOI: 10.1016/j.jmb.2008.08.006

Experimental method

X-RAY DIFFRACTION (2.7 Å)