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Science 1 October 1993:
Vol. 262. no. 5130, pp. 99 - 102
DOI: 10.1126/science.7692597
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Articles

Science, Vol 262, Issue 5130, 99-102
Copyright © 1993 by American Association for the Advancement of Science

articles

Protein enhancement of hammerhead ribozyme catalysis

Z Tsuchihashi, M Khosla, and D Herschlag

Howard Hughes Medical Institute, Stanford University, CA 94305.

When the recognition sequence of a ribozyme is extended beyond a certain length, turnover is slowed and specificity is decreased. Here, it is shown that a protein can help a ribozyme overcome these general limitations on ribozyme activity. Cleavage of an RNA oligonucleotide by a hammerhead ribozyme is enhanced 10- to 20-fold upon addition of a protein derived from the p7 nucleocapsid (NC) protein of human immunodeficiency virus-type 1. The NC protein also enhances the ability of the ribozyme to discriminate between cleavage of RNA oligonucleotides with differing sequences. These catalytic improvements can be attributed to the strand exchange activity of this RNA binding protein. It is conceivable that endogenous or added proteins may provide analogous increases in ribozyme activity and specificity in vivo.


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