Poster abstracts

Poster number 21 submitted by Qi Liu

Contribution of intersubunit bridges to the energy barrier of ribosomal translocation

Qi Liu (Ohio State Biochemistry Program, Center for RNA Biology, The Ohio State University), Kurt Fredrick (Ohio State Biochemistry Program, Center for RNA Biology, Department of Microbiology, The Ohio State University)

Abstract:
In every round of translation elongation, EF-G catalyzes translocation, the movement of tRNAs (and paired codons) to their adjacent binding sites in the ribosome. Previous kinetic studies have shown that the rate of tRNA-mRNA movement is limited by a conformational change in the ribosome termed unlocking. While structural studies offer some clues as to what unlocking might entail, the molecular basis of this conformational change remains an open question. In this study, the contribution of intersubunit bridges to the energy barrier of translocation was systematically investigated. Unlike those targeting B2a and B3, mutations that disrupt bridges B1a, B4, B7a, and B8 each increased the maximal rate of both forward (EF-G dependent) and reverse (spontaneous) translocation. As bridge B1a is predicted to constrain 30S head movement and B4, B7a, and B8 are predicted to constrain intersubunit rotation, these data provide evidence that formation of the unlocked (transition) state involves both 30S head movement and intersubunit rotation.

Keywords: ribosome, translocation, inter-subunit bridge