Abstract
Strains of Erwinia carotovora and Erwinia aroideae, formerly thought only to be inducible, are constitutive for polygalacturonic acid trans‐eliminase. Maximum enzyme formation, however, occurs in the presence of polygalacturonic acid. A release from strong catabolic repression enables glucose‐grown cultures to initiate their attack on polygalacturonic acid and, thereby, eliminates the necessity for the entry of the polymer into the cell. A low constant proportion (less than 25%) of the total polygalacturonic acid trans‐eliminase is present in the culture fluid during the exponential growth‐phase of Erwinia carotovora. The enzyme may be regarded as an exoenzyme. The exact location of polygalacturonic acid trans‐eliminase in the cells was not established; it could be truly intracellular or reside between the cell‐wall and membrane.
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