Dec 2, 2015

Induced-fit of the peptidyl-transferase center of the ribosome and conformational freedom of the esterified amino acids

BioRxiv : the Preprint Server for Biology
Jean Lehmann

Abstract

The catalytic site of most enzymes can essentially deal with only one substrate. In contrast, the ribosome is capable of polymerizing at a similar rate at least 20 different kinds of amino acids from aminoacyl-tRNA carriers while using just one catalytic site, the peptidyl-transferase center (PTC). An induced-fit mechanism has been uncovered in the PTC, but a possible connection between this mechanism and the uniform handling of the substrates has not been investigated. We present an analysis of published ribosome structures supporting the hypothesis that the induced-fit eliminates unreactive rotamers predominantly populated for some A-site aminoacyl esters before induction. We show that this hypothesis is fully consistent with the wealth of kinetic data obtained with these substrates. Our analysis reveals that induction constrains the amino acids into a reactive conformation in a side-chain independent manner. It allows us to highlight the rationale of the PTC structural organization, which confers to the ribosome the very unusual ability to handle large as well as small substrates.

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Mentioned in this Paper

Drug Carriers
Enzymes, antithrombotic
Amino Acids, I.V. solution additive
MT-TA gene
Triplet Codon-amino Acid Adaptor Activity
Papillary Thyroid Carcinoma
Transfer RNA
Centering
Enzymes for Treatment of Wounds and Ulcers
Ribosomes

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