Lysozyme's lectin-like characteristics facilitates its immune defense function

Ruiyan Zhang, Lisha Wu, Thomas Eckert, Monika Burg-Roderfeld, Miguel A. Rojas-Macias, Thomas Lütteke, Vadim B. Krylov, Dmitry A. Argunov, Aritreyee Datta, Philipp Markart, Andreas Guenther, Bengt Norden, Roland Schauer, Anirban Bhunia, Mushira Abdelaziz Enani, Martin Billeter, Axel J. Scheidig, Nikolay E. Nifantiev, Hans-Christian Siebert

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

Interactions between human lysozyme (HL) and the lipopolysaccharide (LPS) of Klebsiella pneumoniae O1, a causative agent of lung infection, were identified by surface plasmon resonance. To characterize the molecular mechanism of this interaction, HL binding to synthetic disaccharides and tetrasaccharides representing one and two repeating units, respectively, of the O-chain of this LPS were studied. pH-dependent structural rearrangements of HL after interaction with the disaccharide were observed through nuclear magnetic resonance. The crystal structure of the HL-tetrasaccharide complex revealed carbohydrate chain packing into the A, B, C, and D binding sites of HL, which primarily occurred through residue-specific, direct or water-mediated hydrogen bonds and hydrophobic contacts. Overall, these results support a crucial role of the Glu35/Asp53/Trp63/Asp102 residues in HL binding to the tetrasaccharide. These observations suggest an unknown glycan-guided mechanism that underlies recognition of the bacterial cell wall by lysozyme and may complement the HL immune defense function.
Original languageEnglish (US)
JournalQuarterly Reviews of Biophysics
Volume50
DOIs
StatePublished - May 30 2017
Externally publishedYes

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