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• W1582717600 endingPage "17208" @default.
• W1582717600 startingPage "17202" @default.
• W1582717600 abstract "The 20-amino acid signal peptide of human pre (delta pro)apolipoprotein A-II contains the tripartite domain structure typical of eukaryotic prepeptides, i.e. a positively charged NH2-terminal (n) region, a hydrophobic core (h) region, and a COOH-terminal polar domain (c region). This signal sequence has multiple potential sites for cotranslational processing making it an attractive model for assessing the consequences of systematic structural alterations on the site selected for signal peptidase cleavage. We previously analyzed 40 mutant derivatives of this model preprotein using an in vitro translation/canine microsome processing assay. The results showed that the position of the boundary between the h and c regions and properties of the -1 residue are critical in defining the site of cotranslational cleavage. To investigate whether structural features in the NH2-terminal region of signal peptides play a role in cleavage specificity, we have now inserted various amino acids between the positively charged n region (NH2-Met-Lys) and the h region of a parental pre(delta pro)apoA-II mutant that has roughly equal cleavage between Gly18 decreases and Gly20 decreases. Movement of the n/h boundary toward the NH2 terminus results in a dramatic shift in cleavage to Gly18 decreases. Replacement of the Lys2 residue with hydrophilic, negatively charged residues preserves the original sites of cleavage. Replacement with a hydrophobic residue causes cleavage to shift upstream. Simultaneous alteration of the position of n/h and h/c boundaries has an additive effect on the site of signal peptidase cleavage. None of these mutations produced a marked decrease in the efficiency of in vitro cotranslational translocation or cleavage. However, in sequence contexts having poor signal function, introduction of hydrophobic residues between the n and h regions markedly improved the efficiency of translocation/processing. We conclude that the position of the n/h boundary as well as positioning of the h/c boundary affects the site of cleavage chosen by signal peptidase." @default.
• W1582717600 created "2016-06-24" @default.
• W1582717600 creator A5011123718 @default.
• W1582717600 creator A5063884903 @default.
• W1582717600 date "1990-10-01" @default.
• W1582717600 modified "2023-10-17" @default.
• W1582717600 title "Structural features in the NH2-terminal region of a model eukaryotic signal peptide influence the site of its cleavage by signal peptidase." @default.
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• W1582717600 doi "https://doi.org/10.1016/s0021-9258(17)44889-7" @default.
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