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Journal of Experimental Botany, Vol. 51, No. 349, pp. 1395-1401, August 2000
© 2000 Oxford University Press

Original Paper

A comparison of proteins from the developing xylem of compression and non-compression wood of branches of Sitka spruce (Picea sitchensis) reveals a differentially expressed laccase

Gordon J. McDougall1

Unit of Plant Biochemistry, Biochemistry and Cell Biology Division, Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, Scotland, UK

Soluble and cell wall-associated proteins were extracted from the developing xylem of the compression and non-compression sides of branches of Sitka spruce (Picea sitchensis (Bong) Carr.) by an identical procedure. Equal amounts of proteins were separated by SDS-PAGE, and polypeptides were identified that were more abundant in soluble and cell wall-associated extracts from the developing xylem of either compression or non-compression wood. Two polypeptides (at apparent Mrs of 48 kDa and 120 kDa) that were more adundant in cell wall-associated extracts of the developing xylem of the compression tissues were selected for amino-terminal protein sequencing. The 48 kDa polypeptide yielded an amino-terminal sequence that had no homology with known protein, gene or EST database sequences. The amino-terminal sequence of the 120 kDa polypeptide was homologous to a number of laccase-type polyphenol oxidases (EC 1.10.3.2) thought to be involved in lignin biosynthesis in trees. Using non-denaturing SDS-PAGE, the 120 kDa laccase was confirmed as a major oxidase activity in extracts of lignifying compression xylem but it was barely detectable in the non-compression extracts where an 85 kDa oxidase was the predominant activity. The differential expression of oxidases in compression and non-compression xylem is discussed.

Key words: Cell wall proteins, compression wood, lignification, Picea, xylogenesis.


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