Electrostatics in the ribosomal tunnel modulate chain elongation rates.

Electrostatics in the ribosomal tunnel modulate chain elongation rates.
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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
Deutsch, Carol
中科院分区:
生物学2区
文献类型:
--
作者:
Lu, Jianli;Deutsch, Carol

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沿核糖体出口隧道的静电电势是不均匀且负面的。静电在隧道中的重要性仍然相对未被调查,但很可能在新生肽的翻译和次要折叠中起作用。为了探测新生的肽电荷在核糖体功能中的作用,我们使用了一种分子胶带测量,该分子胶带量量包含不同数量的带电氨基酸,并测量了链条伸长率。在新生肽完全伸长之前,呈阳性的精氨酸或赖氨酸序列会产生瞬时停滞(暂停)。对于含有中性或负荷马残基的肽而言,从瞬时捕捉到全长新生肽的转化率要比包含呈阳性残基的肽的速度快。我们提供了实验证据,表明外骨外机制不能解释这种特定费用的暂停。我们得出的结论是,暂停是由于隧道与新生肽之间的电荷特异性相互作用所致。
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.
DOI: 10.1016/s0896-6273(00)80143-9
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