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Change of RNase P RNA function by single base mutation correlates with perturbation of metal ion binding in P4 as determined by NMR spectroscopy.

Abstract：

:The solution structures of two 27 nt RNA hairpins and their complexes with cobalt(III)-hexammine [Co(NH(3))(6)(3+)] were determined by NMR spectroscopy. The RNA hairpins are variants of the P4 region from Escherichia coli RNase P RNA: a U-to-A mutant changing the identity of the bulged nucleotide, and a U-to-C, C-to-U double mutant changing only the bulge position. Structures calculated from NMR constraints show that the RNA hairpins adopt different conformations. In the U-to-C, C-to-U double mutant, the conserved bulged uridine in the P4 wild-type stem is found to be shifted in the 3'-direction by one nucleotide when compared with the wild-type structure. Co(NH(3))(6)(3+) is used as a spectroscopic probe for Mg(H(2)O)(6)(2+) binding sites because both complexes have octahedral symmetry and have similar radii. Intermolecular NOE crosspeaks between Co(NH(3))(6)(3+) and RNA protons were used to locate the site of Co(NH(3))(6)(3+) binding to both RNA hairpins. The metal ion binds in the major groove near a bulge loop in both mutants, but is shifted 3' by about one base pair in the double mutant. The change of the metal ion binding site is compared with results obtained on corresponding mutant RNase P RNA molecules as reported by Harris and co-workers (RNA, 1, 210-218).

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Schmitz M

doi

10.1093/nar/gkh961

keywords:

subject

Has Abstract

pub_date

2004-12-02 00:00:00

pages

6358-66

issue

21

eissn

0305-1048

issn

1362-4962

pii

32/21/6358

journal_volume

32

pub_type

杂志文章

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