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• W1785449924 abstract "Mutations that reduce the net positive charge within the hydrophilic segments of the signal peptides of several prokaryotic exported proteins can result in a reduction in the rate of protein export, as well as a reduction in protein synthesis (M. N. Hall, J. Gabay, and M. Shwartz, EMBO J. 2:15-19, 1983; S. Inouye, X. Soberon, T. Franceschini, K. Nakamura, K. Itakura, and M. Inouye, Proc. Natl. Acad. Sci. USA 79:3438-3441, 1982; J. W. Puziss, J. D. Fikes, and P. J. Bassford, Jr., J. Bacteriol. 171:2302-2311, 1989). This result has been interpreted as evidence that the hydrophilic segment is part of a mechanism that obligatorily couples translation to protein export. We have investigated the role of the hydrophilic segment of the Escherichia coli maltose-binding protein (MBP) signal peptide in the export and synthesis of MBP. Deletion of the entire hydrophilic segment from the MBP signal peptide resulted in a defect in MBP export, as well as a dramatic reduction in total MBP synthesis. Suppressor mutations that lie upstream of the malE coding region were isolated. These mutations do not affect MBP export but instead were shown to partially restore MBP synthesis by increasing the efficiency of MBP translational initiation. In addition, analysis of a series of substitution mutations in the second codon of certain malE alleles demonstrated that MBP export and synthesis can be independently affected by mutations in the hydrophilic segment. Finally, analysis of alterations in the hydrophilic segment of the ribose-binding protein signal peptide fused to the mature moiety of the MBP has revealed that the role of the hydrophilic segment in the export process can be functionally separated from any role in translation. Taken together, these results strongly suggest that the hydrophilic segment of the MBP signal peptide is not involved in a mechanism that couples MBP translation to export and argue against the presence of a mechanism that obligatorily couples translation to protein export in Escherichia coli." @default.
• W1785449924 created "2016-06-24" @default.
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• W1785449924 date "1992-10-01" @default.
• W1785449924 modified "2023-09-24" @default.
• W1785449924 title "Alterations in the hydrophilic segment of the maltose-binding protein (MBP) signal peptide that affect either export or translation of MBP" @default.
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• W1785449924 doi "https://doi.org/10.1128/jb.174.20.6488-6497.1992" @default.
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