Catalysis by RNase P RNA. Unique Features and Unprecedented Active Site Plasticity.
(2003) In Journal of Biological Chemistry 278(44). p.43394-43401- Abstract
- Metal ions are essential cofactors for precursor tRNA (ptRNA) processing by bacterial RNase P. The ribose 2'-OH at nucleotide (nt) –1 of ptRNAs is known to contribute to positioning of catalytic Me2+. To investigate the catalytic process, we used ptRNAs with single 2'-deoxy (2'-H), 2'-amino (2'-N), or 2'-fluoro (2'-F) modifications at the cleavage site (nt –1). 2' modifications had small (2.4–7.7-fold) effects on ptRNA binding to E. coli RNase P RNA in the ground state, decreasing substrate affinity in the order 2'-OH > 2'-F > 2'-N > 2'-H. Effects on the rate of the chemical step (about 10-fold for 2'-F, almost 150-fold for 2'-H and 2'-N) were much stronger, and, except for the 2'-N modification, resembled strikingly those... (More)
- Metal ions are essential cofactors for precursor tRNA (ptRNA) processing by bacterial RNase P. The ribose 2'-OH at nucleotide (nt) –1 of ptRNAs is known to contribute to positioning of catalytic Me2+. To investigate the catalytic process, we used ptRNAs with single 2'-deoxy (2'-H), 2'-amino (2'-N), or 2'-fluoro (2'-F) modifications at the cleavage site (nt –1). 2' modifications had small (2.4–7.7-fold) effects on ptRNA binding to E. coli RNase P RNA in the ground state, decreasing substrate affinity in the order 2'-OH > 2'-F > 2'-N > 2'-H. Effects on the rate of the chemical step (about 10-fold for 2'-F, almost 150-fold for 2'-H and 2'-N) were much stronger, and, except for the 2'-N modification, resembled strikingly those observed in the Tetrahymena ribozyme-catalyzed reaction at corresponding position. Mn2+ rescued cleavage of the 2'-N but also the 2'-H-modified ptRNA, arguing against a direct metal ion coordination at this location. Miscleavage between nt –1 and –2 was observed for the 2'-N-ptRNA at low pH (further influenced by the base identities at nt –1 and +73), suggesting repulsion of a catalytic metal ion due to protonation of the amino group. Effects caused by the 2'-N modification at nt –1 of the substrate allowed us to substantiate a mechanistic difference in phosphodiester hydrolysis catalyzed by Escherichia coli RNase P RNA and the Tetrahymena ribozyme: a metal ion binds next to the 2' substituent at nt –1 in the reaction catalyzed by RNase P RNA, but not at the corresponding location in the Tetrahymena ribozyme reaction. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/128584
- author
- Persson, Tina LU ; Cuzic, Simona and Hartmann, Roland K
- organization
- publishing date
- 2003
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Biological Chemistry
- volume
- 278
- issue
- 44
- pages
- 43394 - 43401
- publisher
- American Society for Biochemistry and Molecular Biology
- external identifiers
-
- scopus:0242321976
- ISSN
- 1083-351X
- DOI
- 10.1074/jbc.M305939200
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Organic chemistry (S/LTH) (011001240)
- id
- e83f2fbf-e01b-45c7-bcd5-8c87abe758e1 (old id 128584)
- date added to LUP
- 2016-04-01 11:47:06
- date last changed
- 2022-01-26 18:13:26
@article{e83f2fbf-e01b-45c7-bcd5-8c87abe758e1, abstract = {{Metal ions are essential cofactors for precursor tRNA (ptRNA) processing by bacterial RNase P. The ribose 2'-OH at nucleotide (nt) –1 of ptRNAs is known to contribute to positioning of catalytic Me2+. To investigate the catalytic process, we used ptRNAs with single 2'-deoxy (2'-H), 2'-amino (2'-N), or 2'-fluoro (2'-F) modifications at the cleavage site (nt –1). 2' modifications had small (2.4–7.7-fold) effects on ptRNA binding to E. coli RNase P RNA in the ground state, decreasing substrate affinity in the order 2'-OH > 2'-F > 2'-N > 2'-H. Effects on the rate of the chemical step (about 10-fold for 2'-F, almost 150-fold for 2'-H and 2'-N) were much stronger, and, except for the 2'-N modification, resembled strikingly those observed in the Tetrahymena ribozyme-catalyzed reaction at corresponding position. Mn2+ rescued cleavage of the 2'-N but also the 2'-H-modified ptRNA, arguing against a direct metal ion coordination at this location. Miscleavage between nt –1 and –2 was observed for the 2'-N-ptRNA at low pH (further influenced by the base identities at nt –1 and +73), suggesting repulsion of a catalytic metal ion due to protonation of the amino group. Effects caused by the 2'-N modification at nt –1 of the substrate allowed us to substantiate a mechanistic difference in phosphodiester hydrolysis catalyzed by Escherichia coli RNase P RNA and the Tetrahymena ribozyme: a metal ion binds next to the 2' substituent at nt –1 in the reaction catalyzed by RNase P RNA, but not at the corresponding location in the Tetrahymena ribozyme reaction.}}, author = {{Persson, Tina and Cuzic, Simona and Hartmann, Roland K}}, issn = {{1083-351X}}, language = {{eng}}, number = {{44}}, pages = {{43394--43401}}, publisher = {{American Society for Biochemistry and Molecular Biology}}, series = {{Journal of Biological Chemistry}}, title = {{Catalysis by RNase P RNA. Unique Features and Unprecedented Active Site Plasticity.}}, url = {{http://dx.doi.org/10.1074/jbc.M305939200}}, doi = {{10.1074/jbc.M305939200}}, volume = {{278}}, year = {{2003}}, }