1
|
Agrawal S, Govind Kumar V, Gundampati RK, Moradi M, Kumar TKS. Characterization of the structural forces governing the reversibility of the thermal unfolding of the human acidic fibroblast growth factor. Sci Rep 2021; 11:15579. [PMID: 34341408 PMCID: PMC8329156 DOI: 10.1038/s41598-021-95050-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 06/25/2021] [Indexed: 02/07/2023] Open
Abstract
Human acidic fibroblast growth factor (hFGF1) is an all beta-sheet protein that is involved in the regulation of key cellular processes including cell proliferation and wound healing. hFGF1 is known to aggregate when subjected to thermal unfolding. In this study, we investigate the equilibrium unfolding of hFGF1 using a wide array of biophysical and biochemical techniques. Systematic analyses of the thermal and chemical denaturation data on hFGF1 variants (Q54P, K126N, R136E, K126N/R136E, Q54P/K126N, Q54P/R136E, and Q54P/K126N/R136E) indicate that nullification of charges in the heparin-binding pocket can significantly increase the stability of wtFGF1. Triple variant (Q54P/K126N/R136E) was found to be the most stable of all the hFGF1 variants studied. With the exception of triple variant, thermal unfolding of wtFGF1 and the other variants is irreversible. Thermally unfolded triple variant refolds completely to its biologically native conformation. Microsecond-level molecular dynamic simulations reveal that a network of hydrogen bonds and salt bridges linked to Q54P, K126N, and R136E mutations, are responsible for the high stability and reversibility of thermal unfolding of the triple variant. In our opinion, the findings of the study provide valuable clues for the rational design of a stable hFGF1 variant that exhibits potent wound healing properties.
Collapse
Affiliation(s)
- Shilpi Agrawal
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, USA
| | - Vivek Govind Kumar
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, USA
| | - Ravi Kumar Gundampati
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, USA
| | - Mahmoud Moradi
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, AR, USA
| | | |
Collapse
|
2
|
Ali T, Mushtaq I, Maryam S, Farhan A, Saba K, Jan MI, Sultan A, Anees M, Duygu B, Hamera S, Tabassum S, Javed Q, da Costa Martins PA, Murtaza I. Interplay of N acetyl cysteine and melatonin in regulating oxidative stress-induced cardiac hypertrophic factors and microRNAs. Arch Biochem Biophys 2018; 661:56-65. [PMID: 30439361 DOI: 10.1016/j.abb.2018.11.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 11/08/2018] [Accepted: 11/10/2018] [Indexed: 12/15/2022]
Abstract
Early and specific diagnosis of oxidative stress linked diseases as cardiac heart diseases remains a major dilemma for researchers and clinicians. MicroRNAs may serve as a better tool for specific early diagnostics and propose their utilization in future molecular medicines. We aimed to measure the microRNAs expressions in oxidative stress linked cardiac hypertrophic condition induced through stimulants as Endothelin and Isoproterenol. Cardiac hypertrophic animal models were confirmed by BNP, GATA4 expression, histological assays, and increased cell surface area. High oxidative stress (ROS level) and decreased antioxidant activities were assessed in hypertrophied groups. Enhanced expression of miR-152, miR-212/132 while decreased miR-142-3p expression was observed in hypertrophic condition. Similar pattern of these microRNAs was detected in HL-1 cells treated with H2O2. Upon administration of antioxidants, the miRNAs expression pattern altered from that of the cardiac hypertrophied model. Present investigation suggests that oxidative stress generated during the cardiac pathology may directly or indirectly regulate anti-hypertrophy pathway elements through microRNAs including antioxidant enzymes, which need further investigation. The down-regulation of free radical scavengers make it easier for the oxidative stress to play a key role in disease progression.
Collapse
Affiliation(s)
- Tahir Ali
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Iram Mushtaq
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Sonia Maryam
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Anam Farhan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Kiran Saba
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Muhammad Ishtiaq Jan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Aneesa Sultan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Mariam Anees
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan
| | - Burcu Duygu
- Department of Cardiology, CARIM School for Cardiovascular Diseases, Maastricht University, 6229 ER, Maastricht, The Netherlands
| | - Sadia Hamera
- SBASSE, LUMS, Lahore, 54792, Pakistan; MNF/Institut für Biowissenschaften (IfBI), University of Rostock, Germany
| | - Sobia Tabassum
- Department of Bioinformatics and Biotechnology, IIUI, Islamabad, Pakistan
| | - Qamar Javed
- Preston University - Islamabad Campus, Preston Institute for Nano Science and Technology, Islamabad, 44000, Pakistan
| | - Paula A da Costa Martins
- Department of Cardiology, CARIM School for Cardiovascular Diseases, Maastricht University, 6229 ER, Maastricht, The Netherlands.
| | - Iram Murtaza
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam, University, Islamabad, 45320, Pakistan.
| |
Collapse
|
3
|
Davis JE, Alghanmi A, Gundampati RK, Jayanthi S, Fields E, Armstrong M, Weidling V, Shah V, Agrawal S, Koppolu BP, Zaharoff DA, Kumar TKS. Probing the role of proline -135 on the structure, stability, and cell proliferation activity of human acidic fibroblast growth factor. Arch Biochem Biophys 2018; 654:115-125. [PMID: 30031837 DOI: 10.1016/j.abb.2018.07.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 07/16/2018] [Accepted: 07/18/2018] [Indexed: 01/06/2023]
Abstract
Human acidic fibroblast growth factor 1 (hFGF1) is a protein intricately involved in cell growth and tissue repair. In this study, we investigate the effect(s) of understanding the role of a conserved proline (P135), located in the heparin binding pocket, on the structure, stability, heparin binding affinity, and cell proliferation activity of hFGF1. Substitution of proline-135 with a positively charged lysine (P135K) resulted in partial destabilization of the protein; however, the overall structural integrity of the protein was maintained upon substitution of proline-135 with either a negative charge (P135E) or a polar amino acid (P135Q). Interestingly, upon heparin binding, an increase in thermal stability equivalent to that of wt-hFGF1 was observed when P135 was replaced with a positive (P135K) or a negative charge (P135E), or with a polar amino acid (P135Q). Surprisingly, introduction of negative charge in the heparin-binding pocket at position 135 (P135E) increased hFGF1's affinity for heparin by 3-fold, while the P135K mutation, did not alter the heparin-binding affinity. However, the enhanced heparin-binding affinity of mutant P135E did not translate to an increase in cell proliferation activity. Interestingly, the P135K and P135E double mutations, P135K/R136E and P135/R136E, reduced the heparin binding affinity by ∼3-fold. Furthermore, the cell proliferation activity was increased when the charge reversal mutation R136E was paired with both P135E (P135E/R136E) and P135K (P135K/R136E). Overall, the results of this study suggest that while heparin is useful for stabilizing hFGF1 on the cell surface, this interaction is not mandatory for activation of the FGF receptor.
Collapse
Affiliation(s)
- Julie Eberle Davis
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Arwa Alghanmi
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Ravi Kumar Gundampati
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Srinivas Jayanthi
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Ellen Fields
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Monica Armstrong
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Vanessa Weidling
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Varun Shah
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Shilpi Agrawal
- Department of Chemistry and Biochemistry, University of Arkansas, 1 University of Arkansas, Fayetteville, AR, 72701, USA
| | - Bhanu Prasanth Koppolu
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina-Chapel Hill, Raleigh, NC, 27695, USA
| | - David A Zaharoff
- Joint Department of Biomedical Engineering, North Carolina State University and University of North Carolina-Chapel Hill, Raleigh, NC, 27695, USA
| | | |
Collapse
|