RpbL12 Assists Catalysis by Correctly Positioning the Incoming Aminoacyl-tRNA in the A-Site of 70S Ribosomes

Overview

Journal Open Biochem J

Publisher Bentham Open

Specialty Biochemistry

Date 2018 Sep 11

PMID 30197688

Authors

Jean-Bernard Crechet

Fulbert K AgboSaga

Soria Baouz

Codjo Hountondj

Affiliations

Soon will be listed here.

Abstract

Introduction: We have recently demonstrated that Lys-65 of the 62GANK65 motif of RpbL12 was affinity labeled with a tRNA analogue, resulting in the loss of activity.

Materials And Methods: In this report, we show that mutations operated at the position of Lys-65 led to an impairment in the activity of the mutant ribosomes, except the K65R or K65H bL12 mutants, suggesting that the only requirement of the reaction catalyzed or facilitated by RpbL12is the positive charge of the side chain of Lys-65. We also demonstrate that Lys-65 did not play any role in the peptidyl transferase reaction with respect to puromycin, but rather assisted the binding of the incoming aminoacyl-tRNA to the ribosomal A-site.

Results & Discussions: The protonated, positively charged εNH form of Lys-65 is likely to participate to the binding of aa-tRNA through ionic bonds with phosphate groups, in order to insure the accurate positioning required for the nucleophilic attack of its α-amino group on the carbonyl carbone of peptidyl-tRNA.

Conclusion: This α-NH group is likely to be generated by the unprotonated εNH form of Lys-65 which is capable of withdrawing a proton from the α-NH group of aa-tRNA.

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