1365535-82-5Relevant academic research and scientific papers
Selective recognition of cysteine in its free and protein-bound states by the Zn2+ complex of a triazole-based calix[4]arene conjugate
Kumar Pathak, Rakesh,Tabbasum, Khatija,Kumar Hinge, Vijaya,Pulla Rao, Chebrolu
, p. 13999 - 14003 (2011)
Zinc-ed in: A highly fluorescent zinc complex of triazole-linked calix[4]arene (see scheme), [ZnL], for the selective recognition of Cys and other protein-bound/free thiols in the blood-serum milieu by mimicking the Zn2+-induced redox switch has been developed. Copyright
Imino-phenolic-pyridyl conjugates of calix[4]arene (L1 and L2) as primary fluorescence switch-on sensors for Zn2+ in solution and in HeLa cells and the recognition of pyrophosphate and ATP by [ZnL2]
Kumar Pathak, Rakesh,Kumar Hinge, Vijaya,Rai, Ankit,Panda, Dulal,Pulla Rao, Chebrolu
experimental part, p. 4994 - 5005 (2012/06/15)
Pyridyl-based triazole-linked calix[4]arene conjugates, viz. L1 and L2, were synthesized and characterized. These two conjugates were shown to be selective and sensitive for Zn2+ among the 12 metal ions studied in HEPES buffer medium by fluorescence, absorption, and visual color change with the detection limit of ～31 and ～112 ppb, respectively, by L1 and L2. Moreover, the utility of the conjugates L 1 and L2 in showing the zinc recognition in live cells has also been demonstrated using HeLa cells as monitored by fluorescence imaging. The zinc complexes of L1 and L2 were isolated, and the structure of [ZnL1] has been established by single-crystal XRD and that of [ZnL2] by DFT calculations. TDDFT calculations were performed in order to demonstrate the electronic properties of receptors and their zinc complexes. The isolated zinc complexes, viz. [ZnL1] and [ZnL 2], have been used as molecular tools for the recognition of anions on the basis of their binding affinities toward Zn2+. [ZnL 2] was found to be sensitive and selective toward phosphate-bearing ions and molecules and in particular to pyrophosphate (PPi) and ATP among the other 18 anions studied; however, [ZnL1] was not sensitive toward any of the anions studied. The selectivity has been shown on the basis of the changes observed in the emission and absorption spectral studies through the removal of Zn2+ from [ZnL2] by PPi. Thus, [ZnL 2] has been shown to detect PPi up to 278 ± 10 ppb at pH 7.4 in aqueous methanolic (1/2 v/v) HEPES buffer.
