scholarly journals Single‐Molecule Ex Situ Atomic Force Microscopy Allows Detection of Individual Antibody–Antigen Interactions on a Semiconductor Chip Surface

2020 ◽  
pp. 2000035
Author(s):  
Ming-Pei Lu ◽  
Ying-Ya Weng ◽  
Yuh-Shyong Yang
Keyword(s):  
Atomic Force Microscopy ◽  
Single Molecule ◽  
Ex Situ ◽  
Chip Surface ◽  
Force Microscopy ◽  
Semiconductor Chip ◽  
Atomic Force

Atomic Force Microscopy (AFM) for Topography and Recognition Imaging at Single Molecule Level

2013 ◽  
pp. 102-112
Author(s):  
Memed Duman ◽  
Andreas Ebner ◽  
Christian Rankl ◽  
Jilin Tang ◽  
Lilia A. Chtcheglova ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Single Molecule ◽  
Single Molecule Level ◽  
Force Microscopy ◽  
Atomic Force ◽  
Recognition Imaging

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.

Substrate Specificity of Sugar Transport by Rabbit SGLT1:  Single-Molecule Atomic Force Microscopy versus Transport Studies†

Biochemistry ◽  
2007 ◽  
Vol 46 (10) ◽  
pp. 2797-2804 ◽  
Author(s):  
Theeraporn Puntheeranurak ◽  
Barbara Wimmer ◽  
Francisco Castaneda ◽  
Hermann J. Gruber ◽  
Peter Hinterdorfer ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Substrate Specificity ◽  
Single Molecule ◽  
Sugar Transport ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transport Studies

Ex Situ and In Situ Thermal Transformations of M-50 Pitch Revealed by Non-contact Atomic Force Microscopy

2021 ◽  
Author(s):  
Pengcheng Chen ◽  
Jordan N. Metz ◽  
Adam S. Gross ◽  
Stuart E. Smith ◽  
Steven P. Rucker ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Ex Situ ◽  
Thermal Transformations ◽  
Force Microscopy ◽  
Atomic Force

Ex situ atomic force microscopy studies of growth mechanisms of cadmium mercury thiocyanate crystals

2002 ◽  
Vol 234 (2-3) ◽  
pp. 480-486 ◽  
Author(s):  
X.N. Jiang ◽  
D. Xu ◽  
D.L. Sun ◽  
D.R. Yuan ◽  
M.K. Lu ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Ex Situ ◽  
Growth Mechanisms ◽  
Force Microscopy ◽  
Atomic Force
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