Distal Proton Shuttle Mechanism of Ribosome Catalysed Peptide Bond Formation—A Theoretical Study

Author: Zhang Xiaotong   Jiang Yafei   Mao Qiuyun   Tan Hongwei   Li Xichen   Chen Guangju   Jia Zongchao  

Publisher: MDPI

E-ISSN: 1420-3049|22|4|571-571

ISSN: 1420-3049

Source: Molecules, Vol.22, Iss.4, 2017-03, pp. : 571-571

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Abstract

In this work, we have investigated a novel distal proton shuttle mechanism of ribosome catalyzed peptide bond formation reaction. The reaction was found to follow a two-step mechanism. A distal water molecule located about 6.1 Å away from the attacking amine plays as a proton acceptor and results in a charge-separated intermediate that is stabilized by the N terminus of L27 and the A-site A76 5′-phosphate. The ribose A2451 bridges the proton shuttle pathway, thus plays critical role in the reaction. The calculated 27.64 kcal·mol−1 free energy barrier of the distal proton shuttle mechanism is lower than that of eight-membered ring transition state. The distal proton shuttle mechanism studied in this work can provide new insights into the important biological peptide synthesis process.

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