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Abstract
The intercalative yeast t-RNA binding behavior of some metallo-surfactant complexes, Co(ip)2(TA)2](ClO4)3 (1) and [Co(dpq)2(TA)2](ClO4)3 (2) where TA = Tetradecylamine (Myristylamine), ip = imidazo[4,5-f][1,10]phenanthroline and dpq = dipyrido[3,2-d:2′-3′-f]quinoxaline containing π-conjugated systems (both below and above critical micelle concentration) have been investigated by means of absorption spectral titration, competitive binding, circular dichroism, cyclic voltammetry, and viscometry measurements. Absorption spectral titration results implicate yeast tRNA has significant effects on the binding behaviors of two surfactant complexes via intercalative mode showed a significant absorption band of hypochromicity with red shift. The intrinsic binding constant values below and above CMC were determined as Kb = 6.12 × 105 M−1, 2.31 × 106 M−1, for complex (1) and 7.23 × 105 M−1, 3.57 × 106 M−1, for complex (2). In both sets of complexes (1) and (2), the complexes bind more strongly to yeast tRNA in the above critical micelle concentration can be hydrophobic and confirm intercalation. Competitive displacement studies confirmed that complexes bind to yeast tRNA via intercalative mode. Cyclic voltammetry studies suggest the increasing amounts of yeast tRNA, the cathodic potential Epc for the two complexes shows a positive shift in peak potential indicated the process of binding via intercalation. These observations were further validated by CD, and hydrodynamic measurements. All these studies suggesting that a surfactant complex binds to yeast tRNA appear to be mainly intercalative because of hydrophobicity due to extending aromaticity of the π system of the ligand and planarity of the complex has a significant effect on tRNA binding affinity increasing in the order of complexes containing ligands ip < dpq.
Communicated by Ramaswamy H. Sarma
Author contributions
All the authors have contributed equally.
Disclosure statement
No potential conflict of interest was reported by the authors.
Acknowledgments
This project was supported by Researchers Supporting Project number (RSPD2023R712), King Saud University, Riyadh, Saudi Arabia. The authors are grateful to the management of SRICT Institute of Science & Research (SRICT-ISR), UPL university of Sustainable Technology for providing lab facilities and equipment to perform this study. Dr. K. Nagaraj thanks to Provost and Dean (ISR), UPL University (SRICT-Institute of Science and Research) for financial support.