Selection for efficient translation initiation biases codon usage at second amino acid position in secretory proteins Export

@article{citeulike:6093035, abstract = {The definition of a typical sec-dependent bacterial signal peptide contains a positive charge at the N-terminus, thought to be required for membrane association. In this study the amino acid distribution of all Escherichia coli secretory proteins were analysed. This revealed that there was a statistically significant bias for lysine at the second codon position (P2), consistent with a role for the positive charge in secretion. Removal of the positively charged residue P2 in two different model systems revealed that a positive charge is not required for protein export. A well-characterized feature of large amino acids like lysine at P2 is inhibition of N-terminal methionine removal by methionyl amino-peptidase (MAP). Substitution of lysine at P2 for other large or small amino acids did not affect protein export. Analysis of codon usage revealed that there was a bias for the AAA lysine codon at P2, suggesting that a non-coding function for the AAA codon may be responsible for the strong bias for lysine at P2 of secretory signal sequences. We conclude that the selection for high translation initiation efficiency maybe the selective pressure that has led to codon and consequent amino acid usage at P2 of secretory proteins. 10.1093/nar/gkm577}, author = {Zalucki, Yaramah M. and Power, Peter M. and Jennings, Michael P.}, citeulike-article-id = {6093035}, citeulike-linkout-0 = {http://dx.doi.org/10.1093/nar/gkm577}, citeulike-linkout-1 = {http://nar.oxfordjournals.org/content/35/17/5748.abstract}, citeulike-linkout-2 = {http://nar.oxfordjournals.org/content/35/17/5748.full.pdf}, citeulike-linkout-3 = {http://view.ncbi.nlm.nih.gov/pubmed/17717002}, citeulike-linkout-4 = {http://www.hubmed.org/display.cgi?uids=17717002}, day = {27}, doi = {10.1093/nar/gkm577}, journal = {Nucl. Acids Res.}, keywords = {acid, amino, biases, codon, efficient, initiation, lysine, position, proteins, second, secretory, selection, translation, usage}, month = {September}, number = {17}, pages = {5748--5754}, posted-at = {2009-11-10 13:13:18}, priority = {2}, title = {Selection for efficient translation initiation biases codon usage at second amino acid position in secretory proteins}, url = {http://dx.doi.org/10.1093/nar/gkm577}, volume = {35}, year = {2007} }

TY - JOUR ID - citeulike:6093035 L3 - citeulike-article-id:6093035 N2 - The definition of a typical sec-dependent bacterial signal peptide contains a positive charge at the N-terminus, thought to be required for membrane association. In this study the amino acid distribution of all Escherichia coli secretory proteins were analysed. This revealed that there was a statistically significant bias for lysine at the second codon position (P2), consistent with a role for the positive charge in secretion. Removal of the positively charged residue P2 in two different model systems revealed that a positive charge is not required for protein export. A well-characterized feature of large amino acids like lysine at P2 is inhibition of N-terminal methionine removal by methionyl amino-peptidase (MAP). Substitution of lysine at P2 for other large or small amino acids did not affect protein export. Analysis of codon usage revealed that there was a bias for the AAA lysine codon at P2, suggesting that a non-coding function for the AAA codon may be responsible for the strong bias for lysine at P2 of secretory signal sequences. We conclude that the selection for high translation initiation efficiency maybe the selective pressure that has led to codon and consequent amino acid usage at P2 of secretory proteins. 10.1093/nar/gkm577 IS - 17 JF - Nucl. Acids Res. EP - 5754 TI - Selection for efficient translation initiation biases codon usage at second amino acid position in secretory proteins VL - 35 SP - 5748 KW - acid KW - amino KW - biases KW - codon KW - efficient KW - initiation KW - lysine KW - position KW - proteins KW - second KW - secretory KW - selection KW - translation KW - usage AU - Zalucki, Yaramah AU - Power, Peter AU - Jennings, Michael PY - 2007/09/27/ UR - http://dx.doi.org/10.1093/nar/gkm577 ER -