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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After...
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Probing the Binding Interactions between Chemically Modified siRNAs and Human Argonaute 2 Using Microsecond Molecular

S Harikrishna1, P I Pradeepkumar1

  • 1Department of Chemistry, Indian Institute of Technology Bombay , Mumbai-400076, India.

Journal of Chemical Information and Modeling
|March 14, 2017
PubMed
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Chemical modifications in small interfering RNAs (siRNAs) can impact RNA interference (RNAi) efficacy. This study used molecular dynamics simulations to understand how these modifications affect the human Argonaute 2 protein, guiding better therapeutic siRNA design.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Computational Chemistry

Background:

  • Chemical modifications enhance drug-like properties of small interfering RNAs (siRNAs).
  • Specific sugar modifications in siRNAs can negatively affect RNA interference (RNAi) by interfering with the seed region.
  • Human Argonaute 2 (hAGO2) is the central protein complex driving RNAi.

Purpose of the Study:

  • To investigate the impact of various chemical modifications on siRNA structures within the hAGO2 protein.
  • To understand how modifications at specific positions influence hAGO2 binding and RNAi activity.
  • To utilize computational modeling to guide the design of effective therapeutic siRNAs.

Main Methods:

  • Development of a computational model for the open conformation of hAGO2.
  • Microsecond molecular dynamics (MD) simulations of 15 distinct siRNA-hAGO2 complexes.
  • Analysis of noncovalent interactions and conformational changes in the siRNA seed region.

Main Results:

  • Different chemical modifications, particularly on the sugar moiety, alter noncovalent interactions and conformations within the siRNA seed region.
  • The position and type of chemical modification significantly influence how siRNAs interact with hAGO2.
  • Observed structural changes provide insights into potential effects on siRNA loading and subsequent RNAi activity.

Conclusions:

  • Microsecond MD simulations are effective for analyzing the structural consequences of siRNA chemical modifications.
  • Understanding these structure-activity relationships is crucial for designing therapeutically viable siRNAs.
  • This research provides a foundation for rational design of modified siRNAs with improved efficacy and safety profiles.