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Expression inE. coliand purification ofThermus thermophilustranslation initiation factors IF1 and IF3

Authors
Journal
Protein Expression and Purification
1046-5928
Publisher
Elsevier
Publication Date
Volume
29
Issue
1
Identifiers
DOI: 10.1016/s1046-5928(03)00003-2
Disciplines
  • Biology

Abstract

Abstract The initiation of protein translation in bacteria requires in addition to mRNA, fMet-tRNA, and ribosomal subunits three protein factors, the initiation factor 1 (IF1), initiation factor 2 (IF2), and initiation factor 3 (IF3). The genes coding for IF1 and IF3 from Thermus thermophilus have been identified and cloned into pET expression vector and were expressed as soluble proteins in Escherichia coli. IF1 was purified by a DEAE-cellulose chromatography, followed by heat denaturation, chromatography on Hydroxylapatit, and gel permeation chromatography using Sephacryl 200HR. For the purification of IF3, a heat denaturation step is followed by anion-exchange chromatography on Q-Sepharose FF and gel permeation chromatography on Sephacryl 200HR. Using these procedures we obtained chromatographically pure and biologically active preparations of both T. thermophilus IF1 and IF3.

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