73270-44-7Relevant academic research and scientific papers
Direct18F-Labeling of Biomolecules via Spontaneous Site-Specific Nucleophilic Substitution by F-on Phosphonate Prostheses
Wang, Chao,Zhang, Lei,Mou, Zhaobiao,Feng, Wanru,Li, Zhongjing,Yang, Hongzhang,Chen, Xueyuan,Lv, Shengji,Li, Zijing
, p. 4261 - 4266 (2021/05/26)
We describe a high radiochemical yield late-stage direct 18F-labeling of bare biomolecules containing common active groups. Spontaneity and site-selectivity are attributed to the remarkably higher rates of nucleophilic substitution reactions on phosphonates than on other electrophiles by F- at various hydrogen bond forms. Rapid access to many medicinally significant 18F-labeled biomolecules is achieved at 21-68% radiochemical yields and 35.9-55.1 GBq μmol-1 molar activities both manually or automatically.
A novel theranostic activity-based probe targeting kallikrein 7 for the diagnosis and treatment of skin diseases
Bisyris, Evangelos,Zingkou, Eleni,Kordopati, Golfo G.,Matsoukas, Minos,Magriotis, Plato A.,Pampalakis, Georgios,Sotiropoulou, Georgia
, p. 6507 - 6510 (2021/07/07)
We applied a newin silicoapproach for using protease-substrate motifs to design a kallikrein 7 (KLK7)-specific phosphonate activity-based probe (ABP) to quantify the active KLK7in situ. Epidermal application of the ABP-inhibitor onSpink5?/?Klk5
Enantioselective ester hydrolysis catalyzed by imprinted polymers. 2
Sellergren,Karmalkar,Shea
, p. 4009 - 4027 (2007/10/03)
Highly cross-linked network polymers prepared by molecular imprinting catalyzed enantioselectively the hydrolysis of N-tert-butoxycarbonyl phenylalanine-p-nitrophenyl ester (BOCPheONP). The templates were designed to allow incorporation of the key catalytic elements, found in the proteolytic enzyme chymotrypsin, into the polymer active sites. Three model systems were evaluated. These were constructed from a chiral phosphonate analogue of phenylalanine (series A, C) or L-phenylalanine (series B) attached by a labile ester linkage to an imidazole-containing vinyl monomer. Free radical copolymerization of the template with methacrylic acid (MAA) and ethylene glycol dimethacrylate (EDMA) gave a highly cross-linked network polymer. The templates could be liberated from the polymers by hydrolysis, giving catalytically active sites envisaged to contain an enantioselective binding site, a site complementary to a transition state like structure (series A, C), and a hydroxyl, imidazole, and carboxylic acid group at hydrogen bond distance. As predicted, the enantiomer of BOCPheONP complementary to the configuration of the template was preferentially hydrolyzed with D-selectivity for the series A polymers (kD/kL= 1.9) and L-selectivity for the series B polymers (kL/kD = 1.2). The maximum rate enhancement, when compared with a control polymer, prepared using a benzoyl-substituted imidazole monomer as template, was 2.5, and comparing with the imidazole monomer in solution, a maximum rate enhancement of 10 was observed. The catalytic activity was higher for polymers subjected to the nucleophilic treatment. This was explained by a higher site density and flexibility of the polymer matrix caused by this treatment. In a comparison of template rebinding to polymers imprinted with a template containing either a carboxylate (planar ground state structure) or a phosphonate (tetrahedral transition state like structure) functionality, it was observed that imprinted polymers are able to discriminate between a transition state like and a ground state structure for transesterification. However the influence of transition state stabilization on the observed rate enhancements remains obscure. Only at acidic pH's was catalysis observed, whereas at basic pH's the polymers inhibit the reaction. At a later stage, the catalytic activity of the polymers for nonactivated D- and L-phenylalanine ethyl esters was investigated. A rate enhancement of up to 3 was observed when compared to the blank. Most important, however, the polymers imprinted with a D template preferentially hydrolyzed the D-ethyl ester and exhibited saturation kinetics.
