Epigenetic engineering of ribosomal RNA genes enhances protein production.
Epigenetic engineering of ribosomal RNA genes enhances protein production.
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DOI:
10.1371/journal.pone.0006653
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发表时间:
2009-08-14
期刊:
影响因子:
3.7
通讯作者:
Fussenegger M
中科院分区:
文献类型:
--
作者:
Santoro R;Lienemann P;Fussenegger M
Selection of mammalian high-producer cell lines remains a major challenge for the biopharmaceutical manufacturing industry. Ribosomal RNA (rRNA) genes encode the major component of the ribosome but many rRNA gene copies are not transcribed due to epigenetic silencing by the nucleolar remodelling complex (NoRC), which may limit the cell's full production capacity. Here we show that the knockdown of TIP5, a subunit of NoRC, decreases the number of silent rRNA genes, upregulates rRNA transcription, enhances ribosome synthesis and increases production of recombinant proteins. However, general enhancement of rRNA transcription rate did not stimulate protein synthesis. Our data demonstrates that the number of transcriptionally competent rRNA genes limits efficient ribosome synthesis. Epigenetic engineering of ribosomal RNA genes offers new possibilities for improving biopharmaceutical manufacturing and provides novel insights into the complex regulatory network which governs the translation machinery in normal cellular processes as well as in pathological conditions like cancer.
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