Abstract
It has been reported that catabolite inactivation of sugar transport systems in Saccharomyces cerevisiae requires cAMP-dependent protein kinase activity (cAPK) and that the levels of these transport systems are decreased in the absence of a functional cAPK regulatory subunit. We have re-examined these possibilities and have found that catabolite inactivation does not require cAPK activity and that normal levels of the transports occur independently from the presence of the regulatory subunit. With the available information, it is difficult to ascertain the reasons for the discrepancy between our results and the ones previously reported. The inadequacy of the method used to measure the sugar transport activities might contribute to this discrepancy.
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