4GZS

N2 neuraminidase D151G mutant of a/Tanzania/205/2010 H3N2 in complex with hepes

Summary for 4GZS

• Entry DOI: 10.2210/pdb4gzs/pdb
• Related: 4GZO 4GZP 4GZQ 4GZT 4GZW 4GZX
• Descriptor: Neuraminidase, alpha-D-mannopyranose-(1-3)-[alpha-D-mannopyranose-(1-6)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, alpha-L-fucopyranose-(1-6)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (8 entities in total)
• Functional Keywords: beta-propella, influenza virus, neuraminidase, hemagglutinin, hemadsorption, viral infection, viral protein
• Biological source: Influenza A virus
• Total number of polymer chains: 4
• Total formula weight: 181037.07

Authors

Zhu, X.,Wilson, I.A. (deposition date: 2012-09-06, release date: 2012-10-17, Last modification date: 2023-09-13)

Primary citation

Zhu, X.,McBride, R.,Nycholat, C.M.,Yu, W.,Paulson, J.C.,Wilson, I.A.
Influenza virus neuraminidases with reduced enzymatic activity that avidly bind sialic Acid receptors.
J.Virol., 86:13371-13383, 2012

PubMed Abstract: Influenza virus neuraminidase (NA) cleaves off sialic acid from cellular receptors of hemagglutinin (HA) to enable progeny escape from infected cells. However, NA variants (D151G) of recent human H3N2 viruses have also been reported to bind receptors on red blood cells, but the nature of these receptors and the effect of the mutation on NA activity were not established. Here, we compare the functional and structural properties of a human H3N2 NA from A/Tanzania/205/2010 and its D151G mutant, which supports HA-independent receptor binding. While the wild-type NA efficiently cleaves sialic acid from both α2-6- and α2-3-linked glycans, the mutant exhibits much reduced enzymatic activity toward both types of sialosides. Conversely, while wild-type NA shows no detectable binding to sialosides, the D151G NA exhibits avid binding with broad specificity toward α2-3 sialosides. D151G NA binds the 3' sialyllactosamine (3'-SLN) and 6'-SLN sialosides with equilibrium dissociation constant (K(D)) values of 30.0 μM and 645 μM, respectively, which correspond to much higher affinities than the corresponding affinities (low mM) of HA to these glycans. Crystal structures of wild-type and mutant NAs reveal the structural basis for glycan binding in the active site by exclusively impairing the glycosidic bond hydrolysis step. The general significance of D151 among influenza virus NAs was further explored by introducing the D151G mutation into three N1 NAs and one N2 NA, which all exhibited reduced enzymatic activity and preferential binding to α2-3 sialosides. Since the enzymatic and binding activities of NAs are not routinely assessed, the potential for NA receptor binding to contribute to influenza virus biology may be underappreciated.

PubMed: 23015718
DOI: 10.1128/JVI.01426-12

Experimental method

X-RAY DIFFRACTION (2.35 Å)