Jun SY, Kang SH, Lee KH. Fluorescent labeling of cell-free synthesized proteins with fluorophore-conjugated methionylated tRNA derived from in vitro transcribed tRNA.
J Microbiol Methods 2008;
73:247-51. [PMID:
18423661 DOI:
10.1016/j.mimet.2008.02.016]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2008] [Revised: 02/18/2008] [Accepted: 02/25/2008] [Indexed: 11/18/2022]
Abstract
A simple and practical method for preparing fluorophore-conjugated methionylated tRNA necessary for tRNA-mediated fluorescent labeling of cell-free synthesized proteins was developed. Without complicated chromatographic purification and subsequent concentration, fluorophore-conjugated methionylated tRNA with higher purity and fluorescence concentration could be synthesized from in vitro transcribed tRNA instead of from a total tRNA mixture, which has been routinely used as a tRNA source. Although fluorophore-conjugated methionylated tRNA derived from in vitro transcribed tRNA was purified by simple phenol extraction following alcohol precipitation, it worked well in tRNA-mediated fluorescent labeling, yielding an improved signal-to-noise ratio and higher fluorescence intensity compared to the conventional total tRNA-based method. Based on its simplicity in the preparation of labeling agent with higher purity and fluorescence concentration, the developed method will accelerate the prevalence of fluorescence-based detection of cell-free synthesized proteins.
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