Quantifying E. coli proteome and transcriptome with single-molecule sensitivity in single cells.
Quantifying E. coli proteome and transcriptome with single-molecule sensitivity in single cells.
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DOI:
10.1126/science.1188308
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发表时间:
2010-07-30
期刊:
影响因子:
--
通讯作者:
Xie XS
中科院分区:
文献类型:
--
作者:
Taniguchi Y;Choi PJ;Li GW;Chen H;Babu M;Hearn J;Emili A;Xie XS
Protein and mRNA copy numbers vary from cell to cell in isogenic bacterial populations. However, these molecules often exist in low copy numbers, and are difficult to detect in single cells. Here we carried out quantitative system-wide analyses of protein and mRNA expression in individual cells with single-molecule sensitivity using a newly constructed yellow fluorescent protein fusion library for Escherichia coli. We found that almost all protein number distributions can be described by the gamma distribution with two fitting parameters which, at low expression levels, have clear physical interpretations as the transcription rate and protein burst size. At high expression levels, the distributions are dominated by extrinsic noise. Strikingly, we found that a single cell's protein and mRNA copy numbers for any given gene are uncorrelated.
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