Localization of acid phosphatase in Saccharomyces cerevisiae: a clue to cell wall formation.

Abstract

Acid phosphatase is present in two layers of the cell envelope of Saccharomyces cerevisiae. These are separated by another layer, which is free of acid phosphatase. We have evidence that the cell wall is built up in two stages, which are independent. In the first stage, the cell wall is built up during the formation of the bud. Glucanase vesicles are involved in this process. In the second stage, a thick layer is deposited at the inside against the new cell wall. This results in the thick, rigid wall of the mature yeast cell. This latter layer is probably assembled on the outer surface of the plasmalemma.