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Thakur Y, Tripathi M, Verma B, Khilari R, Agrawal R, Likheshwari, Khursheed Siddiqi M, Pande R, Mohapatra E, Khan RH. Interaction of cobalt(II) and copper(II) hydroxamates with polyriboadenylic acid: An insight into RNA based drug designing. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2019; 38:481-508. [PMID: 30732529 DOI: 10.1080/15257770.2018.1562074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The polyadenylic acid [poly(A)] tail of mRNA plays a noteworthy role in the initiation of the translation, maturation, and stability of mRNA. It also significantly contributes to the production of alternate proteins in eukaryotic cells. Hence, it has recently been recognized as a prospective drug target. Binding affinity of bis(N-p-tolylbenzohydroxamato)Cobalt(II), [N-p-TBHA-Co(II)] (1) and bis(N-p-naphthylbenzohydroxamato)Copper(II), [N-p-NBHA-Cu(II)] (2) complexes with poly(A) have been investigated by biophysical techniques namely, absorption spectroscopy, fluorescence spectroscopy, diffuse reflectance infrared Fourier transform spectroscopy, circular dichroism spectroscopy, viscometric measurements and through molecular docking studies. The intrinsic binding constants (Kb) of complexes were determined following the order of N-p-TBHA-Co(II)] > N-p-NBHA-Cu(II), along with hyperchromism and a bathochromic shift for both complexes. The fluorescence quenching method revealed an interaction between poly(A)-N-p-TBHA-Co(II)/poly(A)-N-p-NBHA-Cu(II). The mode of binding was also determined via the fluorescence ferrocyanide quenching method. The increase in the viscosity of poly(A) that occurred from increasing the concentration of the N-p-TBHA-Co(II)/N-p-NBHA-Cu(II) complex was scrutinized. The characteristics of the interaction site of poly(A) with N-p-TBHA-Co(II)/N-p-NBHA-Cu(II) were adenine and phosphate groups, as revealed by DRS-FTIR spectroscopy. Based on these observations, a partial intercalative mode of the binding of poly(A) has been proposed for both complexes. Circular dichroism confirmed the interaction of both the complexes with poly(A). The molecular docking results illustrated that complexes strongly interact with poly(A) via the relative binding energies of the docked structure as -259.39eV and -226.30eV for N-p-TBHA-Co(II) and N-p-NBHA-Cu(II) respectively. Moreover, the binding affinity of N-p-TBHA-Co(II) is higher in all aspects than N-p-NBHA-Cu(II) for poly(A).
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Affiliation(s)
- Yamini Thakur
- a School of Studies in Chemistry , Pt. Ravishankar Shukla University, Raipur , Chhattisgarh - 492010
| | - Mamta Tripathi
- a School of Studies in Chemistry , Pt. Ravishankar Shukla University, Raipur , Chhattisgarh - 492010
| | - Bharati Verma
- a School of Studies in Chemistry , Pt. Ravishankar Shukla University, Raipur , Chhattisgarh - 492010
| | - Rubi Khilari
- a School of Studies in Chemistry , Pt. Ravishankar Shukla University, Raipur , Chhattisgarh - 492010
| | - Rainy Agrawal
- a School of Studies in Chemistry , Pt. Ravishankar Shukla University, Raipur , Chhattisgarh - 492010
| | - Likheshwari
- a School of Studies in Chemistry , Pt. Ravishankar Shukla University, Raipur , Chhattisgarh - 492010
| | - Mohammad Khursheed Siddiqi
- b Interdisciplinary Biotechnology Unit, Aligarh Muslim University , Aligarh - 202002 , Uttar Pradesh , India
| | - Rama Pande
- a School of Studies in Chemistry , Pt. Ravishankar Shukla University, Raipur , Chhattisgarh - 492010
| | - Eli Mohapatra
- c Biochemistry Department , All India Institute of Medical Sciences, Raipur , Chhattisgarh - 492099
| | - Rizwan Hasan Khan
- b Interdisciplinary Biotechnology Unit, Aligarh Muslim University , Aligarh - 202002 , Uttar Pradesh , India
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