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Evidence for the role of solvated metal hydroxide in the hammerhead cleavage mechanism
Abstract
The log of the rate of the chemical step of hammerhead cleavage in Mg2+ increases linearly with pH between pH 5.7 and 8.9. A slope of approximately 1 indicates that a single deprotonation is required for cleavage. Hammerhead pH-rate profiles with Ca2+, Mn2+, Co2+, and Cd2+ correlate well with the pKa's of these ions in water. This relationship between the pKa's and the pH-rate profile suggests that a metal hydroxide bound to the hammerhead RNA acts as the base in the cleavage mechanism.
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Metadata
- Authors
- Dahm, S. C., Derrick, W. B., & Uhlenbeck, O. C.
- Venue
- Biochemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 1993-12-01
- Volume
- 32
- Issue
- 48
- Pages
- 13040-13045
- ISSN
- 0006-2960 (ISSN-L)
- 1520-4995
- OpenAlex
- W1986764455
- Cited by
- 270
- References
- 41
- FWCI
- 6.99
- Type
- journal article
- Language
- en
- Open access
- closed
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