Effect of Structural Changes Induced by Deletion of 54FLRAPSWF61 Sequence in αB-crystallin on Chaperone Function and Anti-Apoptotic Activity
Abstract
:1. Introduction
2. Results
2.1. The Increase in Chaperone Activity of αBΔ54–61 Mutant Varies with the Substrate Protein
2.2. αBΔ54–61 Is More Susceptible to Cleavage by Trypsin
2.3. Deletion Mutant Forms Chaperone–Substrate Complex with Higher Mass
2.4. Deletion Mutant Showed Greater Anti-Oxidative and Anti-Apoptotic Activity Than αB-wt
2.5. The Increased Anti-Apoptotic Activity of αBΔ54–61 Was Associated with Reduced Caspase Activation
2.6. Treatment with αB-wt and αBΔ54–61 Alters the Levels of Apoptotic Cascade Components in SI-Treated ARPE-19 Cells
2.7. Transduction of αB-wt and αBΔ54–61 into ARPE-19 Cells
3. Discussion
4. Materials and Methods
4.1. Overexpression and Purification of Wild-Type and Mutant αB-Crystallins
4.2. Chaperone Assays
4.3. Limited Proteolysis of Human αB-wt and αBΔ54–61 Using Trypsin
4.4. Chaperone–Substrate Complex Studies
4.5. Cytoprotective Effect of αB-wt and αBΔ54–61 in ARPE-19 Cells
4.6. Cell Viability Assay
4.7. Anti-Oxidative Potential of αB-wt and αBΔ54–61
4.8. Effect of Transduced αB-wt and αBΔ54–61 on Caspase Activation in ARPE-19 Cells
4.9. Regulatory Effect of αB-wt and αBΔ54–61 on Apoptotic Cascade Components in ARPE-19 Cells
4.10. Relative Amounts of Protein Transduced into the ARPE-19 Cells
4.11. Statistical Analysis
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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αB-wt + CS | ||||||
Peak 1 Citrate Synthase | Peak 2 Crystallin or Complex | Peak 3 Complex | ||||
(11.5–12.3 min) | (9.9–10.8 min) | (7.8–9.8 min) | ||||
Incubation time (min) | Average Mw (kDa) | Rh (nm) | Average Mw (kDa) | Rh (nm) | Average Mw (kDa) | Rh (nm) |
0 | 117 (± 0.5%) | 3.95 ± 0.17 | 612 (± 0.2%) | 7.23 ± 0.23 | ND | ND |
40 | 126 (± 0.2%) | 4.10 ± 0.17 | 588 (± 0.2%) | 7.20 ± 0.23 | ND | ND |
80 | 127 (± 0.2%) | 4.30 ± 0.18 | 621 (± 0.1%) | 7.39 ± 0.24 | ND | ND |
αBΔ54–61 + CS | ||||||
Peak 1 Citrate Synthase | Peak 2 Crystallin or Complex | Peak 3 Complex | ||||
(11.5–12.3 min) | (10.3–11.0 min) | (7.8–9.8 min) | ||||
Incubation time (min) | Average Mw (kDa) | Rh (nm) | Average Mw (kDa) | Rh (nm) | Average Mw (kDa) | Rh (nm) |
0 | 110 (± 0.5%) | 3.92 ± 0.18 | 306 (± 0.4%) | 5.3 ± 0.2 | ND | ND |
40 | 174 (± 0.6%) | 6.41 ± 0.25 | 784 (± 0.5%) | 12.0 ± 0.4 | 8105 (± 0.4%) | 16.9 ± 0.5 |
80 | 333 (± 0.5%) | 11.9 ± 0.40 | 1725 (± 0.4%) | 18.9 ± 0.5 | 21,000 (± 0.4%) | 21.9 ± 0.6 |
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Mahalingam, S.; Karmakar, S.; Santhoshkumar, P.; Sharma, K.K. Effect of Structural Changes Induced by Deletion of 54FLRAPSWF61 Sequence in αB-crystallin on Chaperone Function and Anti-Apoptotic Activity. Int. J. Mol. Sci. 2021, 22, 10771. https://doi.org/10.3390/ijms221910771
Mahalingam S, Karmakar S, Santhoshkumar P, Sharma KK. Effect of Structural Changes Induced by Deletion of 54FLRAPSWF61 Sequence in αB-crystallin on Chaperone Function and Anti-Apoptotic Activity. International Journal of Molecular Sciences. 2021; 22(19):10771. https://doi.org/10.3390/ijms221910771
Chicago/Turabian StyleMahalingam, Sundararajan, Srabani Karmakar, Puttur Santhoshkumar, and Krishna K. Sharma. 2021. "Effect of Structural Changes Induced by Deletion of 54FLRAPSWF61 Sequence in αB-crystallin on Chaperone Function and Anti-Apoptotic Activity" International Journal of Molecular Sciences 22, no. 19: 10771. https://doi.org/10.3390/ijms221910771