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DNA-catalyzed lysine side chain modification.

Benjamin M Brandsen1, Tania E Velez, Amit Sachdeva

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801 (USA) http://www.scs.illinois.edu/silverman/

Angewandte Chemie (International Ed. in English)
|July 2, 2014
PubMed
Summary
This summary is machine-generated.

DNA catalysis of lysine modification is now achievable by increasing electrophile reactivity with 5'-phosphorimidazolide (5'-Imp). This breakthrough enables lysine-modified protein preparation, overcoming previous challenges in DNA-guided chemical synthesis.

Keywords:
DNAdeoxyribozymesin vitro selectionlysine modificationpeptides

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Area of Science:

  • Biochemistry
  • Chemical Biology
  • Synthetic Biology

Background:

  • DNA-guided catalysis offers a novel approach for chemical modifications.
  • Modifying aliphatic amino groups, like lysine (Lys), using nucleic acids has been a significant challenge.
  • Previous DNA-catalyzed reactions focused on tyrosine and serine, but Lys modification remained elusive.

Purpose of the Study:

  • To develop a method for DNA-catalyzed covalent modification of lysine side chains.
  • To explore strategies for enhancing the reactivity of electrophilic partners in DNA-catalyzed reactions.
  • To enable the practical preparation of lysine-modified proteins using DNA catalysts.

Main Methods:

  • Investigated DNA-catalyzed modification of lysine in a DNA-anchored peptide substrate.
  • Compared the efficacy of 5 extprime-phosphorimidazolide (5 extprime-Imp) versus 5 extprime-triphosphate (5 extprime-ppp) as electrophilic reaction partners.
  • Examined the role of substrate preorganization versus electrophile reactivity in catalysis.

Main Results:

  • Successfully demonstrated DNA-catalyzed modification of lysine using 5 extprime-Imp.
  • Found that increasing electrophile reactivity (5 extprime-Imp) enabled Lys modification, even without preorganization.
  • Observed no catalysis when using 5 extprime-ppp with a preorganized substrate, highlighting the importance of reactivity.

Conclusions:

  • Substrate reactivity is a critical factor for successful DNA-catalyzed lysine modification, more so than preorganization.
  • The use of 5 extprime-Imp as an electrophile is key to achieving DNA-catalyzed lysine modification.
  • These findings pave the way for developing DNA catalysts for modifying lysine residues in proteins.