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A new affinity approach to isolate Escherichia coli 6S RNA with histidine‐chromatography
Author(s) -
Martins R.,
Queiroz J. A.,
Sousa F.
Publication year - 2010
Publication title -
journal of molecular recognition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.401
H-Index - 79
eISSN - 1099-1352
pISSN - 0952-3499
DOI - 10.1002/jmr.1078
Subject(s) - rna , rna extraction , transfer rna , affinity chromatography , ribosomal rna , escherichia coli , transcription (linguistics) , biology , non coding rna , biochemistry , microbiology and biotechnology , chemistry , gene , enzyme , linguistics , philosophy
6S RNA is an abundant non‐coding RNA in Escherichia coli ( E . coli ), but its function has not been discovered until recently. The first advance on 6S RNA function was the demonstration of its ability to bind the σ 70 ‐holoenzyme form of RNA polymerase, inhibiting its activity and consequently the transcription process. The growing interest in the investigation of non‐coding small RNAs (sRNA) calls for the development of new methods for isolation and purification of RNA. This work presents an optimized RNA extraction procedure and describes a new affinity chromatography method using a histidine support to specifically purify 6S RNA from other E. coli sRNA species. The RNA extraction procedure was optimized, and a high yield was obtained in the separation of sRNA and ribosomal RNA (rRNA) from total RNA (RNAt). This improved method takes advantage of its simplicity and significant cost reduction, since some complex operations have been eliminated. A purification strategy was also developed to separate 6S RNA from an sRNA mixture. Pure RNA can be advantageously obtained using the histidine‐affinity chromatography method, aiming at its application to structural or functional studies. Copyright © 2010 John Wiley & Sons, Ltd.