Recruitment of a species-specific translational arrest module to monitor different cellular processes
Nascent chain-mediated translation arrest serves as a mechanism of gene regulation. A class of regulatory nascent polypeptides undergoes elongation arrest in manners controlled by the dynamic behavior of the growing chain; Escherichia coli SecM monitors the Sec protein export pathway and Bacillus su...
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Veröffentlicht in: | Proceedings of the National Academy of Sciences - PNAS 2011-04, Vol.108 (15), p.6073-6078 |
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creator | Chiba, Shinobu Kanamori, Takashi Ueda, Takuya Akiyama, Yoshinori Pogliano, Kit Ito, Koreaki |
description | Nascent chain-mediated translation arrest serves as a mechanism of gene regulation. A class of regulatory nascent polypeptides undergoes elongation arrest in manners controlled by the dynamic behavior of the growing chain; Escherichia coli SecM monitors the Sec protein export pathway and Bacillus subtilis MifM monitors the YidC membrane protein integration/folding pathway. We show that MifM and SecM interact with the ribosome in a species-specific manner to stall only the ribosome from the homologous species. Despite this specificity, MifM is not exclusively designed to monitor membrane protein integration because it can be converted into a secretion monitor by replacing the N-terminal transmembrane sequence with a secretion signal sequence. These results show that a regulatory nascent chain is composed of two modular elements, one devoted to elongation arrest and another devoted to subcellular targeting, and they imply that physical pulling force generated by the latter triggers release of the arrest executed by the former. The combinatorial nature may assure common occurrence of nascent chain-mediated regulation. |
doi_str_mv | 10.1073/pnas.1018343108 |
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A class of regulatory nascent polypeptides undergoes elongation arrest in manners controlled by the dynamic behavior of the growing chain; Escherichia coli SecM monitors the Sec protein export pathway and Bacillus subtilis MifM monitors the YidC membrane protein integration/folding pathway. We show that MifM and SecM interact with the ribosome in a species-specific manner to stall only the ribosome from the homologous species. Despite this specificity, MifM is not exclusively designed to monitor membrane protein integration because it can be converted into a secretion monitor by replacing the N-terminal transmembrane sequence with a secretion signal sequence. These results show that a regulatory nascent chain is composed of two modular elements, one devoted to elongation arrest and another devoted to subcellular targeting, and they imply that physical pulling force generated by the latter triggers release of the arrest executed by the former. 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A class of regulatory nascent polypeptides undergoes elongation arrest in manners controlled by the dynamic behavior of the growing chain; Escherichia coli SecM monitors the Sec protein export pathway and Bacillus subtilis MifM monitors the YidC membrane protein integration/folding pathway. We show that MifM and SecM interact with the ribosome in a species-specific manner to stall only the ribosome from the homologous species. Despite this specificity, MifM is not exclusively designed to monitor membrane protein integration because it can be converted into a secretion monitor by replacing the N-terminal transmembrane sequence with a secretion signal sequence. These results show that a regulatory nascent chain is composed of two modular elements, one devoted to elongation arrest and another devoted to subcellular targeting, and they imply that physical pulling force generated by the latter triggers release of the arrest executed by the former. 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A class of regulatory nascent polypeptides undergoes elongation arrest in manners controlled by the dynamic behavior of the growing chain; Escherichia coli SecM monitors the Sec protein export pathway and Bacillus subtilis MifM monitors the YidC membrane protein integration/folding pathway. We show that MifM and SecM interact with the ribosome in a species-specific manner to stall only the ribosome from the homologous species. Despite this specificity, MifM is not exclusively designed to monitor membrane protein integration because it can be converted into a secretion monitor by replacing the N-terminal transmembrane sequence with a secretion signal sequence. These results show that a regulatory nascent chain is composed of two modular elements, one devoted to elongation arrest and another devoted to subcellular targeting, and they imply that physical pulling force generated by the latter triggers release of the arrest executed by the former. The combinatorial nature may assure common occurrence of nascent chain-mediated regulation.</abstract><cop>United States</cop><pub>National Academy of Sciences</pub><pmid>21383133</pmid><doi>10.1073/pnas.1018343108</doi><tpages>6</tpages><oa>free_for_read</oa></addata></record> |
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subjects | Amino acids Bacillus subtilis Bacillus subtilis - genetics Bacillus subtilis - metabolism Biological Sciences Cells E coli Escherichia coli Escherichia coli - genetics Escherichia coli - metabolism Escherichia coli Proteins - metabolism Gene Expression Regulation genes Gram-positive bacteria Hybridity membrane proteins Membranes Polypeptides Protein Biosynthesis - genetics Protein secretion protein transport Proteins Ribosomes Ribosomes - metabolism Secretion Securities and Exchange Commission regulation signal peptide Species Specificity Stall Transcription Factors - metabolism translation (genetics) Tunnels |
title | Recruitment of a species-specific translational arrest module to monitor different cellular processes |
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