Volume 127, Issue 10 pp. 2979-2983
Zuschrift

The Catalytic Mechanism of Human Parainfluenza Virus Type 3 Haemagglutinin-Neuraminidase Revealed

Larissa Dirr

Larissa Dirr

Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

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Dr. Ibrahim M. El-Deeb

Corresponding Author

Dr. Ibrahim M. El-Deeb

Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Ibrahim M. El-Deeb, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Patrice Guillon, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Leonard M. G. Chavas, Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestrasse 83, 22607, Hamburg (Germany)

Mark von Itzstein, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

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Dr. Patrice Guillon

Corresponding Author

Dr. Patrice Guillon

Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Ibrahim M. El-Deeb, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Patrice Guillon, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Leonard M. G. Chavas, Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestrasse 83, 22607, Hamburg (Germany)

Mark von Itzstein, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

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Cindy J. Carroux

Cindy J. Carroux

Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

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Dr. Leonard M. G. Chavas

Corresponding Author

Dr. Leonard M. G. Chavas

Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestrasse 83, 22607, Hamburg (Germany)

Ibrahim M. El-Deeb, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Patrice Guillon, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Leonard M. G. Chavas, Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestrasse 83, 22607, Hamburg (Germany)

Mark von Itzstein, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

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Prof. Mark von Itzstein

Corresponding Author

Prof. Mark von Itzstein

Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Ibrahim M. El-Deeb, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Patrice Guillon, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

Leonard M. G. Chavas, Center for Free-Electron Laser Science, Deutsches Elektronen-Synchrotron, Notkestrasse 83, 22607, Hamburg (Germany)

Mark von Itzstein, Institute for Glycomics, Gold Coast Campus, Griffith University, Queensland, 4222 (Australia)

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First published: 10 February 2015

The Australian Research Council (DP1094549, M.v.I. and P.G.) and the National Health and Medical Research Council (ID1047824, ID1071659, M.v.I.) are thanked for financial support. Griffith University is gratefully acknowledged for the award of a Griffith University Postdoctoral Award (I.M.E.D.). Both L.D. and C.J.C gratefully acknowledge the award of Griffith University Postgraduate Scholarships. We thank Dr. Thomas Haselhorst for useful discussions concerning the NMR experiments. We acknowledge the Photon Factory MX beam line crew for their precious help during data collection. We are particularly thankful to T. Senda and F. X. Gallat for hosting L.D. during the experiments and initial work on structure determination of the apo structure. The experiments were performed under the approval of the Photon Factory Program Advisory Committee (Proposal No. 2012G545).

Abstract

Human parainfluenza virus type 3 (hPIV-3) is one of the leading causes for lower respiratory tract disease in children, with neither an approved antiviral drug nor vaccine available to date. Understanding the catalytic mechanism of human parainfluenza virus haemagglutinin-neuraminidase (HN) protein is key to the design of specific inhibitors against this virus. Herein, we used 1H NMR spectroscopy, X-ray crystallography, and virological assays to study the catalytic mechanism of the HN enzyme activity and have identified the conserved Tyr530 as a key amino acid involved in catalysis. A novel 2,3-difluorosialic acid derivative showed prolonged enzyme inhibition and was found to react and form a covalent bond with Tyr530. Furthermore, the novel derivative exhibited enhanced potency in virus blockade assays relative to its Neu2en analogue. These outcomes open the door for a new generation of potent inhibitors against hPIV-3 HN.

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