Inducible protein degradation in Bacillus subtilis using heterologous peptide tags and adaptor proteins to target substrates to the protease ClpXP.

Inducible protein degradation in Bacillus subtilis using heterologous peptide tags and adaptor proteins to target substrates to the protease ClpXP.
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DOI:
10.1111/j.1365-2958.2008.06467.x
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发表时间:
2008-11
影响因子:
3.6
通讯作者:
Grossman AD
Grossman AD
中科院分区:
生物学2区
文献类型:
--
作者:
Griffith KL;Grossman AD

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The ability to manipulate protein levels is useful for dissecting regulatory pathways, elucidating gene function, and constructing synthetic biological circuits. We engineered an inducible protein degradation system for use in Bacillus subtilis based on E. coli and C. crescentus ssrA-tags and SspB adaptors that deliver proteins to ClpXP for proteolysis. In this system, modified ssrA degradation tags are fused onto the 3’ end of the genes of interest. Unlike wild type ssrA, these modified tags require the adaptor protein SspB to target tagged proteins for proteolysis. In the absence of SspB, the tagged proteins accumulate to near physiological levels. By inducing SspB expression from a regulated promoter, the tagged substrates are rapidly delivered to the B. subtilis ClpXP protease for degradation. We used this system to degrade the reporter GFP and several native B. subtilis proteins, including, the transcription factor ComA, two sporulation kinases (KinA, KinB) and the sporulation and chromosome partitioning protein Spo0J. We also used modified E. coli and C. crescentus ssrA tags to independently control the degradation of two different proteins in the same cell. These tools will be useful for studying biological processes in B. subtilis and can potentially be modified for use in other bacteria.
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