Enhanced molecular dynamic simulation studies unravel long-range effects caused by sequence variations and partner binding in RNA aptamers(31 views) Autiero I, Vitagliano L
Institute of Biostructures and Bioimaging, Via Pietro Castellino 111, 80131 Naples, Italy.
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Enhanced molecular dynamic simulation studies unravel long-range effects caused by sequence variations and partner binding in RNA aptamers
Intrinsic flexibility and structural modularity are two common features of RNA molecules. Although functionally crucial, RNA plasticity often represents a major complication in high-resolution structural studies. To overcome this problem, RNAs may be rigidified through the complexation with high-affinity partners such as Fab molecules. This approach has been previously used to characterize the DIR2-aptamer. However, possible perturbations induced by the insertion of the Fab binding site on the DIR2-aptamer conformational properties were not investigated. Here, using enhanced molecular dynamics simulations, we compared the dynamics of the DIR2 aptamer holding the Fab binding site with that of the parental sequence. Our results suggest that the L2-loop modification for the Fab recognition leads to a significant increase in local flexibility that also affects the mobility of distant regions. The trajectories provide clear indications of the groups and the interactions mediating the dynamics transfer in DIR2. The effectiveness of our approach in addressing RNA flexibility was further corroborated by showing its ability to reproduce the most important events affecting the NF-κB RNA aptamer upon dissociation from the partner. Therefore, REMD analyses, a rarely adopted technique to unravel the structural/dynamical properties of aptamers, could efficiently complement experimental data guiding the rational design of nucleic acid therapeutics.
Enhanced molecular dynamic simulation studies unravel long-range effects caused by sequence variations and partner binding in RNA aptamers
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Chandra A, Cogdell R, Crespo-hernandez CE, Datta A, Giussani A, Haacke S, Helliwell J, Improta R, Jayasree RS, Jones M, Karsili T, Kohler B, L , M , Mandal I, Markovitsi D, Medhi H, Mishra PP, Pradeepkumar PI, Roy Chowdhury P, Sarangi M, Schapiro I, Schlichting I, Segarra-marti J, Sharma A, V , V , Van Grondelle R, Watts A * Light induced damage and repair in nucleic acids and proteins: general discussion(179 views) Faraday Discuss (ISSN: 1359-6640print, 1359-6640linking), 2018 Apr 1; 207: 389-408. Impact Factor:4.194 ViewExport to BibTeXExport to EndNote
Bhat V, Cogdell R, Crespo-hernández CE, Datta A, De A, Haacke S, Helliwell J, Improta R, Joseph J, Karsili T, Kohler B, Krishnan R, Mahil LM, Lewis F, Mandal I, Markovitsi D, Mishra PP, Paul S, Periyasamy G, Pradeepkumar PI, Roy Chowdhury P, Sarangi M, Sasikumar D, Schapiro I, Schertler GFX, Schlichting I, Segarra-martí J, Swaminathan R, Vishnu V, Van Grondelle R, Varghese R, Venkatramani R * Photocrosslinking between nucleic acids and proteins: general discussion(182 views) Faraday Discussions, 2018; N/D: N/D-N/D. Impact Factor:3.427 ViewExport to BibTeXExport to EndNote