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      Branch-site selection in a group II intron mediated by active recognition of the adenine amino group and steric exclusion of non-adenine functionalities.

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          Abstract

          The 2'-hydroxyl on a specific bulged adenosine is the nucleophile during the first step of splicing by group II introns. To understand the means by which the ribozyme core recognizes this adenosine, it was mutagenized and effects on catalytic activity were quantified. The results indicate that a low level of mutational variability is tolerated at the branch-site of group II introns, with no apparent loss of fidelity. Analyses of mutant and modified nucleotides at the branch-site reveal that adenine is recognized primarily through the N6 amino group and by steric exclusion of functionalities found on other bases. The mutational and single atom effects reported here contrast with those observed during spliceosomal processing, suggesting that there are important differences in adenosine recognition by the two systems.

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          Author and article information

          Journal
          J Mol Biol
          Journal of molecular biology
          Elsevier BV
          0022-2836
          0022-2836
          Mar 21 1997
          : 267
          : 1
          Affiliations
          [1 ] Department of Biochemistry and Molecular Biophysics, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
          Article
          S0022-2836(96)90845-1
          10.1006/jmbi.1996.0845
          9096215
          53fc0cd4-7284-424d-8a64-34264318e3e6
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