Abstract
Hsp90α is a stress protein that acts as a molecular chaperone and is known to assist in the maturation, folding and stabilization of various cellular proteins known as ‘client proteins’. However, the factors that drive the interaction between Hsp90α and its client proteins are not well understood. In the present investigation, we predicted the basis of the different interaction of Hsp90α with both wild and mutant p53 and other client proteins. We have predicted that the presence of hydrophobic patches having substantial value of hydropathy index and a minimum percent similarity of hydrophobic patches between Hsp90α and its client proteins of 40 % is a necessary condition for client proteins to be recognized by Hsp90α. We also predicted that the overall percentage hydrophobicity of client proteins more than 20 is a required condition for them to bind with Hsp90α. The docking energy of p53 with Hsp90α and with multi-chaperone complex was also separately reported. We have reported from docking result that mutant p53 has a stronger interaction with Hsp90 when associated with multi-chaperone complex than wild type p53 and this might be one of the causes of breast cancer pathogenesis.
Highlights
The molecular chaperone Hsp90 is a highly conserved, essential and abundantly available, homo dimeric molecular chaperone found in the eukaryotic cells [1, 2]
The presence of single or multiple hydrophobic patches in the amino acid sequence was predicted to be an important factor for client proteins to be recognized by Hsp90 (Table 1, Table 7)
Similarity of minimum 40% between hydrophobic patch of Hsp90 and its client proteins was a necessary condition for client proteins to be recognized by Hsp90 (Table 3)
Summary
The molecular chaperone Hsp (heat-shock protein 90) is a highly conserved, essential and abundantly available (available 1–2% of total cellular protein), homo dimeric molecular chaperone found in the eukaryotic cells [1, 2]. The Hsp has been found to be stress inducible and overexpressed in many cancer cells [3]. It is an essential heat shock protein that is involved in the maturation and activation of number of proteins known as client proteins [4]. A large number of Hsp client proteins like transmembrane tyrosine kinases such as Her-2, metastable signaling proteins like Akt,, transcription factor like p53, chimeric signaling proteins like Bcr-Abl, cell cycle regulators (Cdk, Cdk6), and steroid receptors (androgen, estrogen, and progesterone receptors) have been shown to be wrongly regulated in cancer [7]
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