Results 71 to 80 of about 23,598 (268)

Topoisomerase VI senses and exploits both DNA crossings and bends to facilitate strand passage

open access: yeseLife, 2018
Type II topoisomerases manage DNA supercoiling and aid chromosome segregation using a complex, ATP-dependent duplex strand passage mechanism. Type IIB topoisomerases and their homologs support both archaeal/plant viability and meiotic recombination. Topo
Timothy J Wendorff, James M Berger
doaj   +1 more source

Methanosarcina acetivorans C2A topoisomerase IIIα, an archaeal enzyme with promiscuity in divalent cation dependence. [PDF]

open access: yesPLoS ONE, 2011
Topoisomerases play a fundamental role in genome stability, DNA replication and repair. As a result, topoisomerases have served as therapeutic targets of interest in Eukarya and Bacteria, two of the three domains of life.
Raymond Morales   +3 more
doaj   +1 more source

What is the length of a knot in a polymer?

open access: yes, 2005
We give statistical definitions of the length, l, of a loose prime knot tied into a long, fluctuating ring macromolecule. Monte Carlo results for the equilibrium, good solvent regime show that ~ N^t, where N is the ring length and t ~ 0.75 is ...
Marcone, B.   +3 more
core   +1 more source

Assessment of the genotoxicity of quinolone and fluoroquinolones contaminated soil with the Vicia faba micronucleus test [PDF]

open access: yes, 2012
The genotoxicity of quinolone and fluroquinolones was assessed using the micronucleus (MN) test on Viciafaba roots by direct contact exposure to a solid matrix.
Bousquet-Mélou, Alain   +7 more
core   +3 more sources

Mechanically Triggered DNA Nanovehicles for Targeted Dual‐Drug Cancer Therapy

open access: yesAdvanced Science, EarlyView.
A mechanically triggered DNA nanovehicle is introduced that co‐releases two anticancer drugs in response to integrin‐mediated cellular forces. Cholesterol‐anchored DNA assemblies undergo force‐induced unfolding at cell–cell junctions, enabling selective, localized dual‐drug activation in cancer cells while minimizing off‐target toxicity in low‐tension ...
Murali Mohana Rao Singuru   +2 more
wiley   +1 more source

Role of Supercoiling and Topoisomerases in DNA Knotting

open access: yesDNA
DNA knots are deleterious for living cells if not removed. Several theoretical and simulation approaches address the question of how topoisomerases select the intermolecular passages that preferentially lead to unknotting rather than to the knotting of ...
Jorge Cebrián   +6 more
doaj   +1 more source

Mechanism of Type IA Topoisomerases

open access: yesMolecules, 2020
Topoisomerases in the type IA subfamily can catalyze change in topology for both DNA and RNA substrates. A type IA topoisomerase may have been present in a last universal common ancestor (LUCA) with an RNA genome.
Tumpa Dasgupta   +2 more
doaj   +1 more source

Mutations in topoisomerase IIβ result in a B cell immunodeficiency. [PDF]

open access: yes, 2019
B cell development is a highly regulated process involving multiple differentiation steps, yet many details regarding this pathway remain unknown. Sequencing of patients with B cell-restricted immunodeficiency reveals autosomal dominant mutations in ...
Austin, Caroline A   +22 more
core  

Single-molecule experiments in biological physics: methods and applications

open access: yes, 2006
I review single-molecule experiments (SME) in biological physics. Recent technological developments have provided the tools to design and build scientific instruments of high enough sensitivity and precision to manipulate and visualize individual ...
  +351 more
core   +1 more source

Photodynamic Priming and Minocycline Overcome Chemoresistance by Reprogramming the Pancreatic Tumor Immune Microenvironment In Vivo

open access: yesAdvanced Science, EarlyView.
Dual priming with minocycline and photodynamic priming reprograms the pancreatic tumor microenvironment to overcome chemoresistance. By suppressing DNA repair enzyme Tdp1, inducing photooxidative damage, and enhancing irinotecan delivery via light‐activated nanoencapsulation, this strategy remodels the tumor microenvironment and drives immune ...
Fernanda V. Cabral   +7 more
wiley   +1 more source

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