scholarly journals Locked nucleic acid oligomers as handles for single molecule manipulation

2014 ◽  
Vol 42 (19) ◽  
pp. e150-e150 ◽  
Author(s):  
John P. Berezney ◽  
Omar A. Saleh
Keyword(s):  
Nucleic Acid ◽  
Single Molecule ◽  
Locked Nucleic Acid ◽  
Single Molecule Manipulation

scholarly journals Atomic Force Microscopy Investigation of the Interactions between the MCM Helicase and DNA

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 687
Author(s):  
Amna Abdalla Mohammed Khalid ◽  
Pietro Parisse ◽  
Barbara Medagli ◽  
Silvia Onesti ◽  
Loredana Casalis
Keyword(s):  
Atomic Force Microscopy ◽  
Nucleic Acid ◽  
Single Molecule ◽  
Protein Complex ◽  
The Other ◽  
Contour Length ◽  
Force Microscopy ◽  
Atomic Force ◽  
Mcm Complex ◽  
Dna Double Helix

The MCM (minichromosome maintenance) protein complex forms an hexameric ring and has a key role in the replication machinery of Eukaryotes and Archaea, where it functions as the replicative helicase opening up the DNA double helix ahead of the polymerases. Here, we present a study of the interaction between DNA and the archaeal MCM complex from Methanothermobacter thermautotrophicus by means of atomic force microscopy (AFM) single molecule imaging. We first optimized the protocol (surface treatment and buffer conditions) to obtain AFM images of surface-equilibrated DNA molecules before and after the interaction with the protein complex. We discriminated between two modes of interaction, one in which the protein induces a sharp bend in the DNA, and one where there is no bending. We found that the presence of the MCM complex also affects the DNA contour length. A possible interpretation of the observed behavior is that in one case the hexameric ring encircles the dsDNA, while in the other the nucleic acid wraps on the outside of the ring, undergoing a change of direction. We confirmed this topographical assignment by testing two mutants, one affecting the N-terminal β-hairpins projecting towards the central channel, and thus preventing DNA loading, the other lacking an external subdomain and thus preventing wrapping. The statistical analysis of the distribution of the protein complexes between the two modes, together with the dissection of the changes of DNA contour length and binding angle upon interaction, for the wild type and the two mutants, is consistent with the hypothesis. We discuss the results in view of the various modes of nucleic acid interactions that have been proposed for both archaeal and eukaryotic MCM complexes.

Trinucleotide Cap Analogue Bearing a Locked Nucleic Acid Moiety: Synthesis, mRNA Modification, and Translation for Therapeutic Applications

2021 ◽  
Author(s):  
Annamalai Senthilvelan ◽  
Tyson Vonderfecht ◽  
Muthian Shanmugasundaram ◽  
Indra Pal ◽  
Jason Potter ◽  
...  
Keyword(s):  
Nucleic Acid ◽  
Locked Nucleic Acid ◽  
Acid Moiety ◽  
Therapeutic Applications

Solution Structure of a Locked Nucleic Acid Modified Quadruplex: Introducing the V4 Folding Topology

2009 ◽  
Vol 121 (17) ◽  
pp. 3145-3149 ◽  
Author(s):  
Jakob T. Nielsen ◽  
Khalil Arar ◽  
Michael Petersen
Keyword(s):  
Nucleic Acid ◽  
Solution Structure ◽  
Locked Nucleic Acid

i-Motif Formation with Locked Nucleic Acid (LNA)

2007 ◽  
Vol 119 (48) ◽  
pp. 9380-9382 ◽  
Author(s):  
Niti Kumar ◽  
Jakob T. Nielsen ◽  
Souvik Maiti ◽  
Michael Petersen
Keyword(s):  
Nucleic Acid ◽  
Locked Nucleic Acid

A Locked Nucleic Acid-Based Nanocrawler: Designed and Reversible Movement Detected by Multicolor Fluorescence

2013 ◽  
Vol 135 (7) ◽  
pp. 2423-2426 ◽  
Author(s):  
I. Kira Astakhova ◽  
Karol Pasternak ◽  
Meghan A. Campbell ◽  
Pankaj Gupta ◽  
Jesper Wengel
Keyword(s):  
Nucleic Acid ◽  
Locked Nucleic Acid ◽  
Multicolor Fluorescence
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