1
|
Novel far UV–Vis absorbing bis(dihydrophenanthro[9,10-e][1,2,4]triazine) derivative dyes: Synthesis, optical, photophysical and solvatochromic properties. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.127690] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|
2
|
White G, Prior C, Mills SJ, Baker K, Whitfield H, Riley AM, Oganesyan VS, Potter BVL, Brearley CA. Regioisomeric Family of Novel Fluorescent Substrates for SHIP2. ACS Med Chem Lett 2020; 11:309-315. [PMID: 32184962 PMCID: PMC7073872 DOI: 10.1021/acsmedchemlett.9b00368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 10/18/2019] [Indexed: 12/27/2022] Open
Abstract
SHIP2 (SH2-domain containing inositol 5-phosphatase type 2) is a canonical 5-phosphatase, which, through its catalytic action on PtdInsP3, regulates the PI3K/Akt pathway and metabolic action of insulin. It is a drug target, but there is limited evidence of inhibition of SHIP2 by small molecules in the literature. With the goal to investigate inhibition, we report a homologous family of synthetic, chromophoric benzene phosphate substrates of SHIP2 that display the headgroup regiochemical hallmarks of the physiological inositide substrates that have proved difficult to crystallize with 5-phosphatases. Using time-dependent density functional theory (TD-DFT), we explore the intrinsic fluorescence of these novel substrates and show how fluorescence can be used to assay enzyme activity. The TD-DFT approach promises to inform rational design of enhanced active site probes for the broadest family of inositide-binding/metabolizing proteins, while maintaining the regiochemical properties of bona fide inositide substrates.
Collapse
Affiliation(s)
- Gaye White
- School of Biological Sciences, UEA, Norwich Research Park, Norwich NR4 7TJ, U.K
| | - Christopher Prior
- School of Chemistry, UEA, Norwich Research Park, Norwich NR47TJ, U.K
| | - Stephen J. Mills
- Medicinal Chemistry & Drug Discovery, Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, U.K
| | - Kendall Baker
- School of Biological Sciences, UEA, Norwich Research Park, Norwich NR4 7TJ, U.K
| | - Hayley Whitfield
- School of Biological Sciences, UEA, Norwich Research Park, Norwich NR4 7TJ, U.K
| | - Andrew M. Riley
- Medicinal Chemistry & Drug Discovery, Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, U.K
| | | | - Barry V. L. Potter
- Medicinal Chemistry & Drug Discovery, Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, U.K
| | - Charles A. Brearley
- School of Biological Sciences, UEA, Norwich Research Park, Norwich NR4 7TJ, U.K
| |
Collapse
|
3
|
Khan MFS, Wu J, Liu B, Cheng C, Akbar M, Chai Y, Memon A. Fluorescence and photophysical properties of xylene isomers in water: with experimental and theoretical approaches. ROYAL SOCIETY OPEN SCIENCE 2018; 5:171719. [PMID: 29515881 PMCID: PMC5830770 DOI: 10.1098/rsos.171719] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Accepted: 01/04/2018] [Indexed: 06/13/2023]
Abstract
A thorough analysis of the photophysical properties involved in electronic transitions in excitation-emission spectra of xylene isomers has been carried out using the time-dependent density functional theory (PBEPBE/6-31 + G(d,p)) method. For the first time a structural and spectroscopic investigation to distinguish isomers of xylene, a widespread priority pollutant, was conducted experimentally and theoretically. The fluorescence properties of xylene isomers (sole and mixture (binary and ternary)) in water were studied. The fluorescence peak intensities of xylenes were linearly correlated to concentration, in the order of p-xylene > o-xylene > m-xylene at an excitation/emission wavelength (ex/em) of 260 nm/285 nm for o-, m-xylene and ex/em 265 nm/290 nm for p-xylene at the same concentration. The theoretical excitation/emission wavelengths were at ex/em 247 nm/267 nm, 248 nm/269 nm and 251 nm/307 nm for o-, m- and p-xylene, respectively. The vertical excitation and emission state energies of p-xylene (ex/em 4.94 eV/4.03 eV) were lower and the internal conversion energy difference (0.90 eV) was higher than those of m-xylene (ex/em 5.00 eV/4.60 eV) (0.4 eV) and o-xylene (ex/em 5.02 eV/4.64 eV) (0.377 eV). The order of theoretical emission and oscillator strength (0.0187 > 0.0175 > 0.0339) for p-xylene > o-xylene > m-xylene was observed to be in agreement with the experimental fluorescence intensities. These findings provide a novel fast method to distinguish isomers based on their photophysical properties.
Collapse
Affiliation(s)
| | - Jing Wu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, People's Republic of China
| | | | | | | | | | | |
Collapse
|
4
|
Abdelbar MF, El-Sheshtawy HS, Shoueir KR, El-Mehasseb I, Ebeid EZ, El-Kemary M. Halogen bond triggered aggregation induced emission in an iodinated cyanine dye for ultra sensitive detection of Ag nanoparticles in tap water and agricultural wastewater. RSC Adv 2018; 8:24617-24626. [PMID: 35539205 PMCID: PMC9082076 DOI: 10.1039/c8ra04186e] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Accepted: 06/19/2018] [Indexed: 11/21/2022] Open
Abstract
Aggregation induced emission (AIE) has emerged as a powerful method for sensing applications. Based on AIE triggered by halogen bond (XB) formation, an ultrasensitive and selective sensor for picomolar detection of Ag nanoparticles (Ag NPs) is reported. The dye (CyI) has an iodine atom in its skeleton which functions as a halogen bond acceptor, and aggregates on the Ag NP plasmonic surfaces as a halogen bond donor or forms halogen bonds with the vacant π orbitals of silver ions (Ag+). Formation of XB leads to fluorescence enhancement, which forms the basis of the Ag NPs or Ag+ sensor. The sensor response is linearly dependent on the Ag NP concentration over the range 1.0–8.2 pM with an LOD of 6.21 pM (σ = 3), while for Ag+ it was linear over the 1.0–10 μM range (LOD = 2.36 μM). The sensor shows a remarkable sensitivity for Ag NPs (pM), compared to that for Ag+ (μM). The sensor did not show any interference from different metal ions with 10-fold higher concentrations. This result indicates that the proposed sensor is inexpensive, simple, sensitive, and selective for the detection of Ag NPs in both tap and wastewater samples. Based on AIE triggered by halogen bond (XB) formation, we established an ultrasensitive and selective sensor for picomolar detection of Ag nanoparticles (Ag NPs).![]()
Collapse
Affiliation(s)
- Mostafa F. Abdelbar
- Institute of Nanoscience & Nanotechnology
- Kafrelsheikh University
- 33516 Kafrelsheikh
- Egypt
| | - Hamdy S. El-Sheshtawy
- Institute of Nanoscience & Nanotechnology
- Kafrelsheikh University
- 33516 Kafrelsheikh
- Egypt
- Chemistry Department
| | - Kamel R. Shoueir
- Institute of Nanoscience & Nanotechnology
- Kafrelsheikh University
- 33516 Kafrelsheikh
- Egypt
| | - Ibrahim El-Mehasseb
- Chemistry Department
- Faculty of Science
- Kafrelsheikh University
- Kafrelsheikh
- Egypt
| | | | - Maged El-Kemary
- Institute of Nanoscience & Nanotechnology
- Kafrelsheikh University
- 33516 Kafrelsheikh
- Egypt
- Chemistry Department
| |
Collapse
|