Electrostatics in the ribosomal tunnel modulate chain elongation rates.
Electrostatics in the ribosomal tunnel modulate chain elongation rates.
复制标题
核体隧道中的静电调节链伸长速率。
DOI:
10.1016/j.jmb.2008.08.089
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发表时间:
2008-12-05
影响因子:
5.6
通讯作者:
Deutsch, Carol
中科院分区:
文献类型:
--
作者:
Lu, Jianli;Deutsch, Carol
Electrostatic potentials along the ribosomal exit tunnel are non-uniform and negative. The significance of electrostatics in the tunnel remains relatively uninvestigated, yet is likely to play a role in translation and secondary folding of nascent peptides. To probe the role of nascent peptide charges in ribosome function, we used a molecular tape measure that was engineered to contain different numbers of charged amino acids localized to known regions of the tunnel, and measured chain elongation rates. Positively-charged arginine or lysine sequences produce transient arrest (pausing) before the nascent peptide is fully elongated. The rate of conversion from transiently arrested to full-length nascent peptide is faster for peptides containing neutral or negatively-charged residues than for those containing positively-charged residues. We provide experimental evidence that extra-ribosomal mechanisms do not account for this charge-specific pausing. We conclude that pausing is due to charge-specific interactions between the tunnel and the nascent peptide.
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影响因子:
16.2
作者:
Aggarwal, SK;MacKinnon, R
通讯作者:
MacKinnon, R
影响因子:
2.9
作者:
Lu, JL;Deutsch, C
通讯作者:
Deutsch, C
影响因子:
2
作者:
GUISEZ, Y;ROBBENS, J;FIERS, W
通讯作者:
FIERS, W
影响因子:
64.5
作者:
Lin, L;DeMartino, GN;Greene, WC
通讯作者:
Greene, WC
DOI:
10.1016/s0006-291x(02)00226-7
发表时间:
2002-04-26
影响因子:
3.1
作者:
Cortazzo, P;Cerve単ansky, C;Deana, A
通讯作者:
Deana, A