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Nutritional factors controlling exocellular proteinase production in a soil‐isolated Xanthomonas maltophilia strain
Author(s) -
Singer Elisabeth,
Debette Jaqueline
Publication year - 1993
Publication title -
journal of basic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.58
H-Index - 54
eISSN - 1521-4028
pISSN - 0233-111X
DOI - 10.1002/jobm.3620330207
Subject(s) - strain (injury) , microbiology and biotechnology , xanthomonas , biology , food science , bacteria , chemistry , anatomy , genetics
Abstract The exoproteinase of Xanthomonas maltophilia C17 is secreted in the absence of any inducer. When a carbohydrate source (glucose, mannose, cellobiose or maltose) is added to casein‐containing cultures, the bacterial growth is increased to the same extent regardless of the nature of the carbohydrate added. Conversely, proteinase production is enhanced in the presence of cellobiose or glucose, but is repressed in the presence of mannose or maltose compared to the control culture grown without sugar. This repression does not result in an accumulation of proteinase within the cell and is not due to the failure of some secretion process since the enzyme is synthesized de novo. Maltose and mannose are known to be easily metabolizable substrates for X. maltophilia. They seem to be involved in a kind of catabolite repression that cannot be relieved by the addition of cyclic AMP or dibutyryl cyclic AMP and to exert their effect at the transcriptional level.