Human Protein Synthesis Requires aminoacyl-tRNA Pivoting During Proofreading.

ABSTRACT: Rigorous studies have characterized the aa-tRNA selection mechanism in bacteria, which is essential for maintaining translational fidelity. Recent investigations have identified critical distinctions in humans, such as the requirement of subunit rolling and a tenfold slower proofreading step. Although these studies captured key intermediates involved in tRNA selection, they did not elucidate the transitions of aa-tRNA between intermediates. Here, we simulated 1,856 aa-tRNA accommodation events into the human ribosomal A site, revealing the requirement of a distinct ~30° pivoting of aa-tRNA about the anticodon stem within the accommodation corridor. This pivoting is crucial for navigating the crowded accommodation corridor, which becomes more constrained due to subunit rolling. Subunit roll

SUBMITTER: Sapkota D 

PROVIDER: S-EPMC12262582 | biostudies-literature | 2025 Jun

REPOSITORIES: biostudies-literature