Final Answer:
HSP-90 proteins typically have a molecular weight around 90 kilodaltons, and their quaternary structure is dimeric, consisting of two subunits.Therefore,the correct answer is option B) 90 kDa, Dimeric.
Step-by-step explanation:
HSP-90 proteins, or heat shock protein 90, are molecular chaperones crucial for cellular function. The weight of HSP-90 proteins is approximately 90 kilodaltons (kDa), indicating their molecular mass. Additionally, HSP-90 proteins exist in a dimeric quaternary form, meaning they are composed of two subunits.
The dimeric structure of HSP-90 is essential for its function in assisting the proper folding and stabilization of various client proteins within the cell. These client proteins play key roles in cellular processes, including signal transduction, cell cycle control, and apoptosis. The dimeric nature of HSP-90 allows it to form a functional complex that aids in maintaining protein homeostasis and cellular integrity under stressful conditions.
Understanding the molecular weight and quaternary structure of HSP-90 provides insights into its biological functions and its role as a molecular chaperone. The dimeric form allows HSP-90 to interact with client proteins dynamically, contributing to the regulation of diverse cellular processes essential for cell survival and adaptation to environmental stressors.
Therefore,the correct answer is option B) 90 kDa, Dimeric.