tetano
Editor, Senior Moderator
Anal Chem. 2017 Feb 6. doi: 10.1021/acs.analchem.6b04902. [Epub ahead of print]
[h=1]Quantification of Influenza Neuraminidase Activity by Ultra High Performance Liquid Chromatography and Isotope Dilution Mass Spectrometry.[/h] Solano MI, Woolfitt AR, Williams TL, Pierce CL, Gubareva LV, Mishin V, Barr JR.
[h=3]Abstract[/h] Mounting evidence suggests that neuraminidase's functionality extends beyond its classical role in influenza virus infection and that anti-neuraminidase antibodies offer protective immunity. Therefore, a renewed interest in development of neuraminidase (NA)-specific methods to characterize the glycoprotein and evaluate potential advantages for NA standardization in influenza vaccines has emerged. NA displays sialidase activity by cleaving off the terminal N-acetylneuraminic acid on α-2-3 or α-2-6 sialic acid containing receptors of host cells. The type and distribution of these sialic acid containing receptors is considered to be an important factor in transmission efficiency of influenza viruses between and among host species. Changes in HA binding and NA specificity in reassortant viruses may be related to emergence of new and potentially dangerous strains of influenza. Current methods to investigate neuraminidase activity use small derivatized sugars that are poor models for natural glycoprotein receptors and do not provide information on the linkage specificity. Here, a novel approach for rapid and accurate quantification of influenza neuraminidase activity is achieved utilizing Ultra-high Performance Liquid Chromatography (UPLC) and Isotope Dilution Mass Spectrometry (IDMS). Direct LC-MS/MS quantification of NA-released sialic acid provides precise measurement of influenza neuraminidase activity over a range of substrates. The method provides exceptional sensitivity and specificity with a limit of detection of 0.38 ?M for sialic acid and the capacity to obtain accurate measurements of specific enzyme activity preference towards α-2,3-sialyllactose linkages, α-2,6-sialyllactose linkages or whole glycosylated proteins such as fetuin.
PMID: 28192976 DOI: 10.1021/acs.analchem.6b04902
[PubMed - as supplied by publisher]
[h=1]Quantification of Influenza Neuraminidase Activity by Ultra High Performance Liquid Chromatography and Isotope Dilution Mass Spectrometry.[/h] Solano MI, Woolfitt AR, Williams TL, Pierce CL, Gubareva LV, Mishin V, Barr JR.
[h=3]Abstract[/h] Mounting evidence suggests that neuraminidase's functionality extends beyond its classical role in influenza virus infection and that anti-neuraminidase antibodies offer protective immunity. Therefore, a renewed interest in development of neuraminidase (NA)-specific methods to characterize the glycoprotein and evaluate potential advantages for NA standardization in influenza vaccines has emerged. NA displays sialidase activity by cleaving off the terminal N-acetylneuraminic acid on α-2-3 or α-2-6 sialic acid containing receptors of host cells. The type and distribution of these sialic acid containing receptors is considered to be an important factor in transmission efficiency of influenza viruses between and among host species. Changes in HA binding and NA specificity in reassortant viruses may be related to emergence of new and potentially dangerous strains of influenza. Current methods to investigate neuraminidase activity use small derivatized sugars that are poor models for natural glycoprotein receptors and do not provide information on the linkage specificity. Here, a novel approach for rapid and accurate quantification of influenza neuraminidase activity is achieved utilizing Ultra-high Performance Liquid Chromatography (UPLC) and Isotope Dilution Mass Spectrometry (IDMS). Direct LC-MS/MS quantification of NA-released sialic acid provides precise measurement of influenza neuraminidase activity over a range of substrates. The method provides exceptional sensitivity and specificity with a limit of detection of 0.38 ?M for sialic acid and the capacity to obtain accurate measurements of specific enzyme activity preference towards α-2,3-sialyllactose linkages, α-2,6-sialyllactose linkages or whole glycosylated proteins such as fetuin.
PMID: 28192976 DOI: 10.1021/acs.analchem.6b04902
[PubMed - as supplied by publisher]