A newborn male is admitted to the neonatal ICU with meconium ileus, recurrent lung infections, and failure to thrive. Genetic testing reveals a homozygous ΔF508 mutation in the CFTR gene, leading to a diagnosis of cystic fibrosis. The physician explains that this mutation causes improper folding of the CFTR protein, preventing its trafficking to the cell membrane. Which of the following molecules is most responsible for assisting protein folding and preventing misfolded protein aggregation in the cell?
