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Issue 4, 2011
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Identifying selective inhibitors against the human cytosolic sialidase NEU2 by substrate specificity studies

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Abstract

Aberrant expression of human sialidases has been shown to associate with various pathological conditions. Despite the effort in the sialidase inhibitor design, less attention has been paid to designing specific inhibitors against human sialidases and characterizing the substrate specificity of different sialidases regarding diverse terminal sialic acid forms and sialyl linkages. This is mainly due to the lack of sialoside probes and efficient screening methods, as well as limited access to human sialidases. A low cellular expression level of the human sialidase NEU2 hampers its functional and inhibitory studies. Here we report the successful cloning and expression of the human sialidase NEU2 in E. coli. About 11 mg of soluble active NEU2 was routinely obtained from 1 L of E. coli cell culture. Substrate specificity studies of the recombinant human NEU2 using twenty p-nitrophenol (pNP)-tagged α2–3- or α2–6-linked sialyl galactosides containing different terminal sialic acid forms including common N-acetylneuraminic acid (Neu5Ac), non-human N-glycolylneuraminic acid (Neu5Gc), 2-keto-3-deoxy-D-glycero-D-galacto-nonulosonic acid (Kdn), or their C5-derivatives in a microtiter plate-based high-throughput colorimetric assay identified a unique structural feature specifically recognized by the human NEU2 but not two bacterial sialidases. The results obtained from substrate specificity studies were used to guide the design of a sialidase inhibitor that was selective against human NEU2. The selectivity of the inhibitor was revealed by the comparison of sialidase crystal structures and inhibitor docking studies.

Graphical abstract: Identifying selective inhibitors against the human cytosolic sialidase NEU2 by substrate specificity studies

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Publication details

The article was received on 22 Oct 2010, accepted on 29 Nov 2010 and first published on 04 Jan 2011


Article type: Paper
DOI: 10.1039/C0MB00244E
Citation: Mol. BioSyst., 2011,7, 1060-1072
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    Identifying selective inhibitors against the human cytosolic sialidase NEU2 by substrate specificity studies

    Y. Li, H. Cao, H. Yu, Y. Chen, K. Lau, J. Qu, V. Thon, G. Sugiarto and X. Chen, Mol. BioSyst., 2011, 7, 1060
    DOI: 10.1039/C0MB00244E

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