Abstract
In this paper we describe a new beta-lactam-binding protein from the cell envelope of Escherichia coli. It can be detected in cells grown at either 37 or 42 degrees C in medium containing glucose but not in cells grown at 30 degrees C. This novel component has an apparent molecular size that is 2.0 kilodaltons larger than that of penicillin-binding protein 3 and is derived from the latter through a divalent-cation-mediated process probably catalyzed by components located in the periplasmic space. The significance of this protein with regard to regulation of the amount of functional penicillin-binding protein 3 in the cell is discussed.
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