Abstract:
:Several independent assay procedures were used to estimate the activities of the enzyme constituents of the phosphoenolpyruvate-sugar phosphotransferase system (PTS) in osmotically shocked bacterial membrane vesicles. The soluble enzymes of the system were found to be in association with the membrane by several criteria. Phosphoenolpyruvate-dependent sugar phosphorylation was catalyzed by this membrane-bound enzyme system far more efficiently than by a mixture of the individual enzymes at corresponding concentrations. By contrast, the rates of the phosphoryl exchange reactions catalyzed by enzyme I and the enzyme II complexes were essentially the same for the associated and dissociated forms of the system. Functional association of the PTS-enzyme complex was stabilized by Mg++ and phosphoenolypyruvate and could be destroyed by detergent treatment, sonication, or by passage of the vesicle preparation through a French pressure cell. These results lead to the possibility that in the intact bacterial cell the soluble enzymes of the phosphotransferase system exist, in part, as peripheral membrane constituents associated with the integral membrane enzyme II complexes.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Saier MH Jr,Cox DF,Feucht BU,Novotny MJdoi
10.1002/jcb.1982.240180210subject
Has Abstractpub_date
1982-01-01 00:00:00pages
231-8issue
2eissn
0730-2312issn
1097-4644journal_volume
18pub_type
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journal_title:Journal of cellular biochemistry
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