Reference: de Alteriis E, et al. (1999) Clues to the origin of high external invertase activity in immobilized growing yeast: prolonged SUC2 transcription and less susceptibility of the enzyme to endogenous proteolysis. Can J Microbiol 45(5):413-7

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Abstract


Expression of the SUC2 gene encoding invertase was studied using free and gelatin-immobilized yeast cells to try to explain the high activity of this enzyme exhibited by immobilized cells when allowed to grow in a nutrient medium. The results indicated that at least two factors are probably responsible for the accumulation of invertase in immobilized cells. First, the expression of the SUC2 gene was maintained throughout growth in immobilized cells, whereas its expression was only transient in free cells. Second, invertase of immobilized cells was shown to be less susceptible to endogenous proteolytic attack than that of the corresponding free cells. These results have been interpreted, respectively, in terms of diffusional limitations and changes in the pattern of invertase glycosylation due to growth of yeast in an immobilized state.

Reference Type
Comparative Study | Journal Article
Authors
de Alteriis E, Alepuz PM, Estruch F, Parascandola P
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