Basis for Structural Diversity in Homologous RNAs

+ See all authors and affiliations

Science  01 Oct 2004:
Vol. 306, Issue 5693, pp. 104-107
DOI: 10.1126/science.1101489

You are currently viewing the abstract.

View Full Text


Large RNA molecules, such as ribozymes, fold with well-defined tertiary structures that are important for their activity. There are many instances of ribozymes with identical function but differences in their secondary structures, suggesting alternative tertiary folds. Here, we report a crystal structure of the 161-nucleotide specificity domain of an A-type ribonuclease P that differs in secondary and tertiary structure from the specificity domain of a B-type molecule. Despite the differences, the cores of the domains have similar three-dimensional structure. Remarkably, the similar geometry of the cores is stabilized by a different set of interactions involving distinct auxiliary elements.

View Full Text