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Proteomic analysis of untreated stationary cells led to the detection of 1712 proteins (65% of the predicted ORFs). Treatment with ADEP4 resulted in decreased abundance of 243 proteins (p¡Ü0.05 and 2-fold decrease) (Fig 1A) (Extended Data Table 1). This however is likely an underestimate. The proteome reports changes in the relative abundance of peptides produced by trypsin cleavage. A protein that was only cleaved once, for example, by ADEP4/ClpP and was not further degraded prior to trypsin treatment would still generate several tryptic peptides and not show an overall decrease in protein abundance. To address this, we analyzed partially-tryptic peptides to uncover additional ADEP/ClpP targets. Partially tryptic peptides exist at certain abundance in untreated cells due to natural degradation, followed by trypsin treatment. However, the levels of these peptides increases or decreases markedly due to degradation induced by addition of ADEP; as is obvious from the abundance of red spots. An increase of partially tryptic peptides indicates ADEP degradation of a protein resulting in partially tryptic peptides. This analysis revealed 174 additional ADEP/ClpP targets (peptides of increased abundance; Fig 1B; Extended Data Table 2). A decrease on the other hand indicates that a particular degradation product, present at the time of ADEP addition, can be further degraded by ADEP/ClpP and are of less relevance to the study. |
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5Â¥2014-10-25 00:49:08
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raohuihua: ½ð±Ò+15, ·ÒëEPI+1, ¡ïÓаïÖú 2014-10-24 09:57:42
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