Nature Methods
- 5, 69 - 74 (2008)
Published online: 16 December 2007; | doi:10.1038/nmeth1148
A proteome chip approach reveals new DNA damage recognition activities in Escherichia coliChien-Sheng Chen1, 2, 4, Ekaterina Korobkova3, 4, Hao Chen3, Jian Zhu1, Xing Jian3, Sheng-Ce Tao1, Chuan He3 & Heng Zhu11
Department of Pharmacology and Molecular Sciences & High Throughput Biology Center, Johns Hopkins University School of Medicine, Broadway Research Building 333, 733 Broadway, Baltimore, Maryland 21205, USA. 2
Department of Food Science, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 20224, Taiwan. 3
Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, USA. 4
These authors contributed equally to this work.
Correspondence should be addressed to Heng Zhu hzhu4@jhmi.edu or Chuan He chuanhe@uchicago.edu Despite the fact that many genomes have been decoded, proteome chips comprising individually purified proteins have been reported only for budding yeast, mainly because of the complexity and difficulty of high-throughput protein purification. To facilitate proteomics studies in prokaryotes, we have developed a high-throughput protein purification protocol that allowed us to purify 4,256 proteins encoded by the Escherichia coli K12 strain within 10 h. The purified proteins were then spotted onto glass slides to create E. coli proteome chips. We used these chips to develop assays for identifying proteins involved in the recognition of potential base damage in DNA. By using a group of DNA probes, each containing a mismatched base pair or an abasic site, we found a small number of proteins that could recognize each type of probe with high affinity and specificity. We further evaluated two of these proteins, YbaZ and YbcN, by biochemical analyses. The assembly of libraries containing DNA probes with specific modifications and the availability of E. coli proteome chips have the potential to reveal important interactions between proteins and nucleic acids that are time-consuming and difficult to detect using other techniques.
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