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Default An NMR characterization of the regA protein-binding site of bacteriophage T4 gene 44

An NMR characterization of the regA protein-binding site of bacteriophage T4 gene 44 mRNA.

Related Articles An NMR characterization of the regA protein-binding site of bacteriophage T4 gene 44 mRNA.

J Biol Chem. 1991 Sep 25;266(27):17832-7

Authors: Szewczak AA, Webster KR, Spicer EK, Moore PB

The conformations of two RNA dodecamers that differ markedly in affinity for the regA protein from bacteriophage T4 have been examined by NMR to see if the ability of that protein to discriminate between mRNAs is based on pre-existing differences in their three-dimensional structures. One of the RNAs examined has the same sequence as the site where regA protein binds when it inhibits the expression of gene 44's mRNA. The second RNA differs from the first in having a U instead of a G at position -9; it binds regA protein 100 times less tightly. The NMR data indicate that both RNAs have similar single-stranded conformations and that they each resemble an isolated strand of a double helix. They also show that most, if not all of the ribose rings in both molecules have appreciable 2'-endo puckering. It is unlikely that regA protein distinguishes between these two molecules on the basis of differences in their global conformations in solution.

PMID: 1917925 [PubMed - indexed for MEDLINE]



Source: PubMed
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