RESUMO
Novel 3-hydroxy-3-phenylpropanoate ester-azidothymidine (AZT) conjugates have been prepared using Baylis-Hillman methodology, and their potential as dual-action HIV-1 Integrase and Reverse Transcriptase inhibitors has been explored using enzyme inhibition and computer modelling techniques; their activity and HeLa cell toxicity have been compared with those of their cinnamate ester analogues.
Assuntos
Inibidores de Integrase de HIV/química , Inibidores de Integrase de HIV/farmacologia , HIV-1/efeitos dos fármacos , Inibidores da Transcriptase Reversa/química , Inibidores da Transcriptase Reversa/farmacologia , Zidovudina/química , Zidovudina/farmacologia , Fármacos Anti-HIV , Infecções por HIV/tratamento farmacológico , Infecções por HIV/virologia , Integrase de HIV/metabolismo , Inibidores de Integrase de HIV/síntese química , Transcriptase Reversa do HIV/antagonistas & inibidores , Transcriptase Reversa do HIV/metabolismo , HIV-1/enzimologia , Células HeLa , Humanos , Simulação de Acoplamento Molecular , Inibidores da Transcriptase Reversa/síntese química , Relação Estrutura-Atividade , Zidovudina/síntese químicaRESUMO
Baylis-Hillman-derived 3-(benzylaminomethyl)coumarins have been treated, sequentially, with chloroacetyl chloride and propargylamine to afford alkynylated coumarins as substrates for Click Chemistry reactions with azidothymidine (AZT) in the presence of a Cu(I) catalyst. The dual-action HIV-1 protease (PR) and reverse transcriptase (RT) inhibition potential of the resulting N-benzylated cycloaddition products, and a series of non-benzylated analogues, has been explored using saturation transfer difference (STD) NMR, computer modelling and enzyme inhibition techniques.
Assuntos
Cumarínicos/química , Cumarínicos/farmacologia , Inibidores da Protease de HIV/química , Inibidores da Protease de HIV/farmacologia , Transcriptase Reversa do HIV/antagonistas & inibidores , HIV-1/enzimologia , Inibidores da Transcriptase Reversa/química , Inibidores da Transcriptase Reversa/farmacologia , Cumarínicos/síntese química , Infecções por HIV/tratamento farmacológico , Infecções por HIV/virologia , Protease de HIV/metabolismo , Inibidores da Protease de HIV/síntese química , Transcriptase Reversa do HIV/metabolismo , HIV-1/efeitos dos fármacos , Humanos , Modelos Moleculares , Inibidores da Transcriptase Reversa/síntese química , Zidovudina/síntese química , Zidovudina/química , Zidovudina/farmacologiaRESUMO
The protein inhibitor of activated signal transducer and activator of transcription 3 (PIAS3) regulates the transcriptional activity of signal transducer and activator of transcription 3 (STAT3) which regulates transcription of genes involved in cell growth, proliferation and apoptosis. The conserved proline, isoleucine, asparagine, isoleucine, threonine (PINIT) domain of PIAS3 is thought to promote STAT3-PIAS3 interaction. The (His)(7) -PINIT domain (PIAS3(85-272) ) was heterologously expressed and purified to homogeneity by nickel affinity and size exclusion chromatography, and shown to be a folded monomer in solution. Using surface plasmon resonance spectroscopy (SPR) the PINIT domain (PIAS3(85-272) ) alone was shown to specifically bind to STAT3 in a concentration dependent manner. L97A, R99N and R99Q mutations of the PINIT domain were found to abrogate binding to STAT3, suggesting that these residues were part of a potential binding surface. An homology model for the PINIT domain was calculated to analyse the potential locations of L97 and R99 in the structure, and to evaluate the potential role of these residues in interactions with STAT3.