Počet záznamů: 1

Nucleotides that are essential but not conserved; a sufficient L-tryptophan site in RNA

  1. 1.
    0353565 - UOCHB-X 2011 RIV US eng J - Článek v odborném periodiku
    Majerfeld, I. - Chocholoušová, Jana - Malaiya, V. - Widmann, J. - McDonald, D. - Reeder, J. - Iyer, M. - Illangasekare, M. - Yarus, M. - Knight, R.
    Nucleotides that are essential but not conserved; a sufficient L-tryptophan site in RNA.
    R N A. Roč. 16, č. 10 (2010), s. 1915-1924 ISSN 1355-8382
    Grant CEP: GA MŠk ME09019
    Výzkumný záměr: CEZ:AV0Z40550506
    Klíčová slova: SELEX * molecular modeling * aptamer * evolution * tryptophan
    Kód oboru RIV: CC - Organická chemie
    Impakt faktor: 6.051, rok: 2010

    Conservation is often used to define essential sequences within RNA sites. However, conservation finds only invariant sequence elements that are necessary for function, rather than finding a set of sequence elements sufficient for function. Here we define a critical test of sufficiency: We embed a minimal, apparently sufficient motif for binding the amino acid tryptophan in a random-sequence background and ask whether we obtain functional molecules. After a negative result, we use a combination of three-dimensional structural modeling, selection, designed mutations, high-throughput sequencing, and bioinformatics to explore functional insufficiency. This reveals an essential unpaired G in a diverse structural context, varied sequence, and flexible distance from the invariant internal loop binding site identified previously. Addition of the new element yields a sufficient binding site by the insertion criterion, binding tryptophan in 22 out of 23 tries.
    Trvalý link: http://hdl.handle.net/11104/0192791