• Non-Watson Crick base pairs might stabilize RNA structural motifs in ribozymes — a comparative study of group-I intron structures

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/jbsc/028/05/0547-0555

    • Keywords

       

      Group-I intron; non-canonical base pair; ribozyme; RNA structure; Tetrahymena thermophila ; wobble base pair

    • Abstract

       

      In recent decades studies on RNA structure and function have gained significance due to discoveries on diversified functions of RNA. A common element for RNA secondary structure formed by series of non-Watson/Watson Crick base pairs, internal loops and pseudoknots have been the highlighting feature of recent structural determination of RNAs. The recent crystal structure of group-I introns has demonstrated that these might constitute RNA structural motifs in ribozymes, playing a crucial role in their enzymatic activity. To understand the functional significance of these non-canonical base pairs in catalytic RNA, we analysed the sequences of group-I introns from nuclear genes. The results suggest that they might form the building blocks of folded RNA motifs which are crucial to the catalytic activity of the ribozyme. The conservation of these, as observed from divergent organisms, argues for the presence of non-canonical base pairs as an important requisite for the structure and enzymatic property of ribozymes by enabling them to carry out functions such as replication, polymerase activity etc. in primordial conditions in the absence of proteins.

    • Author Affiliations

       

      K Chandrasekhar1 R Malathi1

      1. Department of Genetics Dr ALM PG Institute of Basic Medical Sciences, University of Madras, Taramani Campus, Chennai - 600 113, India
    • Dates

       
  • Journal of Biosciences | News

© 2017-2019 Indian Academy of Sciences, Bengaluru.