Journal: The Journal of Biological Chemistry
Article Title: Two distinct classes of cochaperones compete for the EEVD motif in heat shock protein 70 to tune its chaperone activities
doi: 10.1016/j.jbc.2022.101697
Figure Lengend Snippet: Mutations in the EEVD motif reduce collaboration between Hsp72 and DnaJB4. A , ATP hydrolysis assay comparing the turnover rate of Hsp72 WT and mutants in the presence of DnaJB4, as measured by malachite green assay. The left graph shows mean intrinsic ATPase rate ±SD (n = 3) of the various Hsp72 mutants. The right graph shows mean ATPase rate ±SD (n = 3) of the various Hsp72 mutants in the presence of increasing concentrations of DnaJB4. Curves were fit according to Michaelis–Menten kinetics at steady state. Statistics were performed using unpaired Student’s t test (∗ p < 0.05, ns, not significant). B , luciferase refolding assay comparing WT and mutant Hsp72 in the presence of DnaJB4. Refolding was measured by SteadyGlo luciferase reagent (see the ). The graph shows mean percent luciferase refolded relative to nondenatured luciferase control ±SD (n = 3). C , luciferase refolding assay comparing WT and I637A mutant Hsp72 in the presence of DnaJB4 or DnaJA2. The graph shows mean percent luciferase refolded relative to nondenatured luciferase control ±SD (n = 3).
Article Snippet: Luminescence was measured using the SteadyGlo luminescence reagent (Promega), and percent refolded luciferase was calculated using a standard curve of 100 to 0 nM native luciferase.
Techniques: Hydrolysis Assay, Malachite Green Assay, Luciferase, Mutagenesis, Control