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A Method for Isolation of DNA-Binding Proteins Based on Solubility of DNA-Protein Complexes

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The study of DNA-binding proteins is crucial in understanding gene regulatory networks. We developed a new method for the enrichment of DNA-binding proteins based on the variability of DNA-protein complexes' solubility in different ionic strength solutions. 0.14M sodium chloride was determined as the most efficient extraction concentration to precipitate DNA-binding proteins. SDS-PAGE analysis revealed that some high-abundance proteins were removed effectively and at the same time DNA-binding proteins were isolated in this simple process. Twenty kinds of proteins were identified in the acquired sample by 1-D gel-LC-MS/MS. Furthermore, computerized analysis of MS data showed that quite a number of unmatched peptides have the classic structure of leucine zipper or zinc finger, which were symbolic elements of transcription factors. These results suggested that this new method can acquire DNA-binding proteins effectively and allow improvement in the isolation of high-quality DNA-binding proteins.
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Keywords: DNA-binding protein; DNA-protein Complexes; SDS-PAGE; gene regulatory networks; isolation; solubility; transcription factors; zinc finger

Document Type: Research Article

Publication date: 2012-10-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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