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Papers In Press, published online ahead of print January 6, 2005
Laboratory of Biochemistry and Genetics, NIDDK/NIH, Bethesda, MD 20892
Corresponding Author: enricoc{at}bdg10.niddk.nih.gov
In yeast, chitin is laid down at three locations: a ring at the mother-bud neck, the primary septum and, after cytokinesis, the cell wall of the daughter cell. Some of the chitin is free, the remainder attached to beta(1-3)glucan or beta(1-6)glucan. We recently reported that the chitin ring contributes to the prevention of growth at the mother-bud neck and hypothesized that this inhibition is achieved by a preferential binding of chitin to beta(1-3)glucan at that site. Here, we devised a novel strategy for the analysis of chitin cross-links in 14C-glucosamine-labeled cell walls, involving solubilization in water of alkali-treated walls by carboxymethylation. Intact cell walls or their digestion products with beta(1-3)glucanase or beta(1-6)glucanase were carboxymethylated and fractionated on size columns, and the percentage of chitin bound to different polysaccharides was calculated. Chitin dispersed in the wall was labeled in maturing unbudded cells and that of the ring in early budding cells. The former was mostly attached to beta(1-6)glucan and the latter to beta(1-3)glucan. This confirmed our hypothesis and indicated that the cell has mechanisms to attach chitin, a water-insoluble substance, synthesized here through chitin synthase III, to different acceptors, depending on location. In contrast, most of the chitin synthase II-dependent chitin of the primary septum was free, with the remainder linked to beta(1-3)glucan.
J. Biol. Chem, 10.1074/jbc.M414005200
Submitted on December 13, 2004
Revised on January 6, 2005
Accepted on January 6, 2005
Synthase III-dependent chitin is bound to different acceptors depending on location on the cell wall of budding yeast
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