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Dityrosine, Trityrosine and Tetratyrosine, Potential Cross-Links in Structural Proteins of Plant-Parasitic Nematodes

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For more content, see Nematology.

Dityrosine, a dimeric amino acid formed by the oxidative coupling of two tyrosine residues, was found in egg shells, cyst walls and juveniles of the plant-parasitic nematodes Globodera rostochiensis, G. pallida and Heterodera avenae. Trityrosine (= tertyrosine) and tetratyrosine were also present. A proportion of the cyst protein that was insoluble in sodium dodecyl sulphate and mercaptoethanol was solubilised by treatment with sodium chlorite under conditions shown to cause complete destruction of dityrosine. We suggest that dityrosine and its higher homologues act as inter-polypeptide bridges, responsible for cross-linking cyst and egg-shell proteins. We also discuss the significance of such cross-links for the resistance of nematode eggs to environmental hazards, including fungal parasites.

Affiliations: 1: ) Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, U.K.; 2: ) Department of Botany, University of Edinburgh, The King's Buildings, Mayfield Road, Edinburgh EH9 3JH, U.K.

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/content/journals/10.1163/002825989x00304
1989-01-01
2016-12-08

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