Journal
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
Volume 331, Issue 2, Pages 549-551Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2005.03.220
Keywords
Microcin J25; RNA polymerase; MccJ25 amidated derivative; oxygen consumption
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Microcin J25 appears to have two intracellular targets: (1) RNA polymerase, which was described in Escherichia coli and Salmonella enterica serovars, and (2) cell respiration in Salmonella enterica serovars. C-terminal glycine amidation of the threaded segment localized in the MccJ25 lariat ring region specifically blocked the RNA-polymerase inhibition, but not the cell respiration inhibition and peptide uptake. These results suggest that different regions or the molecule are responsible for each cellular effect, they are localized far away from the beta-hairpin region and the C-terminal region is an important determinant for RNAP inhibition. (c) 2005 Elsevier Inc. All rights reserved.
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