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Journal of Bacteriology, December 1999, p. 7414-7420, Vol. 181, No. 24
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
Localization of Synthesis of
1,6-Glucan in
Saccharomyces cerevisiae
Roy C.
Montijn,1,
Edwin
Vink,1
Wally H.
Müller,2
Arie J.
Verkleij,2
Herman
Van Den
Ende,1
Bernard
Henrissat,3 and
Frans
M.
Klis1,*
Swammerdam Institute of Life Science,
University of Amsterdam, BioCentrum Amsterdam, Amsterdam 1098 SM,1 and Department of Molecular Cell
Biology, University of Utrecht, 3584 CH
Utrecht,2 The Netherlands, and
Architecture et Fonction des Macromolécules Biologiques,
CNRS-IFR1, 13402 Marseille cedex 20, France3
Received 28 June 1999/Accepted 27 September 1999
1,6-Glucan is a key component of the yeast cell wall,
interconnecting cell wall proteins,
1,3-glucan, and chitin. It has been postulated that the synthesis of
1,6-glucan begins in the endoplasmic reticulum with the formation of protein-bound primer structures and that these primer structures are extended in the Golgi
complex by two putative glucosyltransferases that are functionally redundant, Kre6 and Skn1. This is followed by maturation steps at the
cell surface and by coupling to other cell wall macromolecules. We have
reinvestigated the role of Kre6 and Skn1 in the biogenesis of
1,6-glucan. Using hydrophobic cluster analysis, we found that Kre6
and Skn1 show significant similarities to family 16 glycoside hydrolases but not to nucleotide diphospho-sugar glycosyltransferases, indicating that they are glucosyl hydrolases or transglucosylases instead of genuine glucosyltransferases. Next, using immunogold labeling, we tried to visualize intracellular
1,6-glucan in
cryofixed sec1-1 cells which had accumulated secretory
vesicles at the restrictive temperature. No intracellular labeling was
observed, but the cell surface was heavily labeled. Consistent with
this, we could detect substantial amounts of
1,6-glucan in isolated
plasma membrane-derived microsomes but not in post-Golgi secretory
vesicles. Taken together, our data indicate that the synthesis of
1,6-glucan takes place largely at the cell surface. An alternative
function for Kre6 and Skn1 is discussed.
*
Corresponding author. Mailing address: Swammerdam
Institute of Life Science, University of Amsterdam, BioCentrum
Amsterdam, Kruislaan 318, Amsterdam 1098 SM, The Netherlands. Phone:
31-20-525 7834. Fax: 31-20-525 7934. E-mail:
klis{at}bio.uva.nl.

Present address: TNO Nutrition and Food Research Institute, 3700 AJ
Zeist, The
Netherlands.
Journal of Bacteriology, December 1999, p. 7414-7420, Vol. 181, No. 24
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.
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