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Binding and Fluorescence Resonance Energy Transfer (FRET) of Ruthenium(II)-Bipyridine-Calixarene System with Proteins—Experimental and Docking Studies

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Abstract

The investigation of the interaction of ruthenium(II)-bipyridine-tert-butylcalix[4]arene complexes (Rubc2 and Rubc3) with proteins (BSA and ovalbumin) using absorption, emission, excited state lifetime and circular dichroism techniques and by docking studies show that luminophore-receptor system bind strongly with proteins. An enhancement of absorption as well as emission intensity of Ru(II)-calixarene complexes in the presence of proteins, but the quenching of the emission intensity of proteins in the presence of Ru(II)-calixarene complexes are the interesting observations. The enhancement of emission intensity of Ru(II)-calixarene complex, in the presence of proteins, is due to the fluorescence resonance energy transfer (FRET) from protein to Ru(II)-calixarene complex. Among the two Ru(II)-calixarene complexes synthesized Rubc3 has more efficient binding and energy transfer than Rubc2 and BSA, with a large cavity size, has the advantage for binding over ovalbumin. Docking studies reveal that the presence of tert-butylcalix[4]arene moiety in Ru(II)-calixarene complexes facilitates binding with proteins. After the binding of Rubc2 and Rubc3 with proteins, the nearby fluorophores present in proteins are in optimal distance from the ruthenium centre for efficient FRET process to occur.

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Acknowledgement

We thank Prof. P. Ramamurthy, National Centre for Ultrafast Processes, University of Madras, Taramani, Chennai for his help in excited state lifetime studies. We thank Prof. S. Krishnasamy, School of Biotechnology, Madurai Kamaraj University for his help in the docking studies. We thank UGC-UPE for financial support. We thank Dr. M. Vairamani, IICT, Hyderabad for his help in taking HR-MS.

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  1. School of Chemistry, Madurai Kamaraj University, Madurai, 625021, India

    P. Muthu Mareeswaran, D. Maheshwaran, E. Babu & S. Rajagopal

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Correspondence to S. Rajagopal.

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Mareeswaran, P.M., Maheshwaran, D., Babu, E. et al. Binding and Fluorescence Resonance Energy Transfer (FRET) of Ruthenium(II)-Bipyridine-Calixarene System with Proteins—Experimental and Docking Studies. J Fluoresc 22, 1345–1356 (2012). https://doi.org/10.1007/s10895-012-1074-9

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