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In a paper on the facultative autotroph, Pseudomonas saccharophila, Doudoroff (1940) noted that this organism forms an extracellular amylase when grown with starch as a source of carbon. Later studies showed that this enzyme could be formed also in resting cellular suspensions simply by the addition of starch or maltose (Klein and Doudoroff, unpublished experiments). In this respect, P. saccharophila appears to be similar to P. fluorescens and P. putrefaciens, both of which can be induced to form enzymes in the absence of added nitrogenous compounds (Stanier, 1951; Klein and Doudoroff, 1950). These bacteria thus resemble yeasts in their capacity to form new enzyme protein from endogenous sources. The purpose of the experiments reported here is to describe and characterize the amylase system of P. saccharophila, to test the effect of various factors on the induction of this enzyme, and to study possible interactions between the induction of amylase and that of another inducible system.

SOME ASPECTS OF THE INDUCED BIOSYNTHESIS OF ALPHA-AMYLASE OF PSEUDOMONAS SACCHAROPHILA