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. 1970 Jan;116(1):61–69. doi: 10.1042/bj1160061

The enzymic composition of the isolated cell wall and plasma membrane of baker's yeast

T Nurminen 1, E Oura 1, H Suomalainen 1
PMCID: PMC1185324  PMID: 4312424

Abstract

A study was made of the enzyme content of the isolated cell walls and of a plasma-membrane preparation obtained by centrifugation after enzymic digestion of the cell walls of baker's yeast. The isolated cell walls showed no hexokinase, alkaline phosphatase, esterase or NADH oxidase activity. It was concluded that these enzymes exist only in the interior of the cell. Further, only a negligible activity of deamidase was detectable in the cell walls. Noticeable amounts of saccharase, phosphatases hydrolysing p-nitrophenyl phosphate, ATP, ADP, thiamin pyrophosphate and PPi, with optimum activity at pH3–4, and an activity of Mg2+-dependent adenosine triphosphatase at neutral pH, were found in the isolated cell walls. During enzymic digestion, the other activities appearing in the cell walls were mostly released into the medium, but the bulk of the Mg2+-dependent adenosine triphosphatase remained in the plasma-membrane preparation. Accordingly, it may be assumed that the enzymes released into the medium during digestion are located in the cell wall outside the plasma membrane, whereas the Mg2+-dependent adenosine triphosphatase is an enzyme of the plasma membrane. This enzyme differs from the phosphatases with pH optima in the range pH3–4 with regard to location, pH optimum, substrate specificity and different requirement of activators.

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Selected References

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