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Default A study of D52S hen lysozyme-GlcNAc oligosaccharide complexes by NMR spectroscopy and

A study of D52S hen lysozyme-GlcNAc oligosaccharide complexes by NMR spectroscopy and electrospray mass spectrometry.

Related Articles A study of D52S hen lysozyme-GlcNAc oligosaccharide complexes by NMR spectroscopy and electrospray mass spectrometry.

FEBS Lett. 1992 Jan 20;296(2):153-7

Authors: Lumb KJ, Aplin RT, Radford SE, Archer DB, Jeenes DJ, Lambert N, MacKenzie DA, Dobson CM, Lowe G

The production of a mutant hen lysozyme is described in which Asp-52, one of the catalytically important residues, is replaced by Ser. The mutant enzyme has very low catalytic activity but NMR studies show that its structure is closely similar to that of the wild-type protein. NMR experiments also show that well defined complexes are formed with GlcNAc4 and GlcNAc6 bound in the active site of the mutant enzyme. These complexes have been examined using electrospray mass spectrometry (ESMS). The most intense peaks arise from the uncomplexed protein indicating that dissociation takes place in the mass spectrometer under the conditions used here. Peaks from minor species corresponding to complexes between the protein and the oligosaccharides are, however, also observed. The possibility that the latter arise from novel covalent enzyme-saccharide complexes is discussed.

PMID: 1733771 [PubMed - indexed for MEDLINE]



Source: PubMed
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