The C-Type Lysozyme from the upper Gastrointestinal Tract of Opisthocomus hoatzin, the Stinkbird

Taylor, Edward and Skjøt, Michael and Skov, Lars K. and Klausen, Mikkel and De Maria, Leonardo and Gippert, Garry P. and Turkenburg, Johan P. and Davies, Gideon J. and Wilson, Keith S. (2019) The C-Type Lysozyme from the upper Gastrointestinal Tract of Opisthocomus hoatzin, the Stinkbird. International Journal of Molecular Sciences, 20 (22). ISSN 1422-0067

Full content URL: https://www.mdpi.com/1422-0067/20/22/5531

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The C-Type Lysozyme from the upper Gastrointestinal Tract of Opisthocomus hoatzin, the Stinkbird
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Abstract

Muramidases/lysozymes are important bio-molecules, which cleave the glycan backbone in the peptidoglycan polymer found in bacterial cell walls. The glycoside hydrolase (GH) family 22 C-type lysozyme, from the folivorous bird Opisthocomus hoazin (stinkbird), was expressed in Aspergillus oryzae, and a set of variants was produced. All variants were enzymatically active, including those designed to probe key differences between the Hoatzin enzyme and Hen Egg White lysozyme. Four variants showed improved thermostability at pH 4.7, compared to the wild type. The X-ray structure of the enzyme was determined in the apo form and in complex with chitin oligomers. Bioinformatic analysis of avian GH22 amino acid sequences showed that they separate out into three distinct subgroups (chicken-like birds, sea birds and other birds). The Hoatzin is found in the “other birds” group and we propose that this represents a new cluster of avian upper-gut enzymes.

Keywords:lysozyme; peptidoglycan cleavage; avian gut GH22; crystal structure
Subjects:C Biological Sciences > C560 Biotechnology
C Biological Sciences > C790 Molecular Biology, Biophysics and Biochemistry not elsewhere classified
C Biological Sciences > C760 Biomolecular Science
Divisions:College of Science > School of Life Sciences
ID Code:38723
Deposited On:07 Nov 2019 10:10

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