Results 61 to 70 of about 1,452,122 (130)

Transcriptional supercoiling boosts topoisomerase II-mediated knotting of intracellular DNA [PDF]

, 2019
Recent studies have revealed that the DNA cross-inversion mechanism of topoisomerase II (topo II) not only removes DNA supercoils and DNA replication intertwines, but also produces small amounts of DNA knots within the clusters of nucleosomes that ...
Micheletti, Cristian, Diaz-Ingelmo, O., Segura, Joana, Díaz-Ingelmo, Ofelia, Martinez-Garcia, B., Dyson, Sílvia, Coronel, Lucia, Segura, J., Valdés, Antonio, Martínez-García, Belén, Micheletti, C., Valdes, A., Dyson, S., Roca, Joaquim, Roca, J., Coronel, L.   +15 more
core   +1 more source

DNA supercoiling and its role in DNA decatenation and unknotting [PDF]

Chromosomal and plasmid DNA molecules in bacterial cells are maintained under torsional tension and are therefore supercoiled. With the exception of extreme thermophiles, supercoiling has a negative sign, which means that the torsional tension diminishes
Witz, Guillaume, Stasiak, Andrzej
core   +2 more sources

Controllable DNA Condensation by Mixed Cationic Gemini/Nonionic Surfactant Systems: Structure, Thermodynamics, and Cytotoxicity

Journal of Surfactants and Detergents, EarlyView.
ABSTRACT Controllable DNA condensation is important for nucleic‐acid packaging and non‐viral gene‐delivery systems. This study aimed to determine how the composition of mixed nonionic C12E10 and cationic gemini C12C6C12Br2 surfactants regulates DNA condensation, structure, thermodynamics, and cytotoxicity.
Bo Wang, Linyi Zhu, Yaxun Fan, Yilin Wang   +3 more
wiley   +1 more source

Advancing Therapies for Mycobacterial Diseases: From Small Molecules to Host‐Directed Strategies

Medicinal Research Reviews, EarlyView.
ABSTRACT The global burden of multidrug‐resistant tuberculosis (MDR‐TB) and the rising incidence of nontuberculous mycobacterial (NTM) infections highlight the urgent need for innovative therapeutic strategies. Current treatments are prolonged, toxic, and increasingly compromised by resistance and limited diagnostic capacity.
Tânia Silva, Alessandra Aiello, Tonino Alonzi, M. Alice Carvalho, Vladimir Finger, Delia Goletti, Sven Hoffner, Yousra Kherabi, Jan Korabecny, Julia Kulczyńska, Agnieszka Kyzioł, Alicia Lacoma, Filomena Martins, Zorica Nanovic, Sepideh Hosseiniporgham, Martina Hrast Rambaher, Leonardo Antonio Sechi, Daria Smalchuk, Grażyna Stochel, Lydia Tabernero, Nancy L. Tateosian, Violeta Valcheva, Anamarija Zega, Mafalda Sarraguça   +23 more
wiley   +1 more source

Cellular Strategies for Regulating DNA Supercoiling: A Single-Molecule Perspective [PDF]

, 2010
Entangling and twisting of cellular DNA (i.e., supercoiling) are problems inherent to the helical structure of double-stranded DNA. Supercoiling affects transcription, DNA replication, and chromosomal segregation.
Koster, Daniel A., Aurélien Crut, Daniel A. Koster, Crut, Aurélien, Stewart Shuman, Mary-Ann Bjornsti, Nynke H. Dekker, Dekker, Nynke H., Shuman, Stewart, Bjornsti, Mary-Ann   +9 more
core   +1 more source

Molecular Basis for Uracil‐DNA‐Glycosylase to Identify DNA Damage in the Nucleosome

Proteins: Structure, Function, and Bioinformatics, EarlyView.
ABSTRACT The DNA base‐excision repair (BER) pathway is initiated by a glycosylase, such as uracil‐DNA‐glycosylase (UDG), which identifies and removes a wrong base incorporated in the DNA sequence. The very early steps in the identification of the DNA damage are crucial to the correct initiation of the repair chain, and become even more complex when ...
Safwen Ghediri, Ralf Blossey, Fabrizio Cleri   +2 more
wiley   +1 more source

A Novel Antioxidant Peptide Cath‐Np Derived from Nanorana parkeri Attenuates UVB‐Induced Skin Photodamage in Mice

Integrative Zoology, EarlyView.
Schematic representation of Cath‐Np as an antioxidant suppressing acute skin damage caused by ultraviolet B (UVB) radiation in mice. Cath‐Np inhibits the activation of p53 and mitogen‐activated protein kinase pathways while it activates the Nrf2 pathway by its strong antioxidant effects, and accordingly suppresses the expression of inflammatory factors
Hang Liao, Xiaoxiao Shen, Jinwei Chai, Kai wang, Jiena Wu, Jianxi Yang, Ming Chen, Guoxiang Mo, Xueqing Xu   +8 more
wiley   +1 more source

DNA supercoiling-mediated G4/R-loop formation tunes transcription by controlling the access of RNA polymerase

Nature Communications
RNA polymerase (RNAP) is a processive motor that modulates DNA supercoiling and reshapes DNA structures. The feedback loop between the DNA topology and transcription remains elusive.
Jihee Hwang, Chun-Ying Lee, Sumitabha Brahmachari, Shubham Tripathi, Tapas Paul, Huijin Lee, Alanna Craig, Taekjip Ha, Sua Myong   +8 more
doaj   +1 more source

Transgenic selection and underlying mechanisms in apicomplexan parasites

The FEBS Journal, EarlyView.
Transgenic selection markers have driven genetic engineering in apicomplexans, enabling precise, iterative experiments. This review discusses mechanistic details of drug selection markers, strategies for marker recycling, and practical considerations for several clinically relevant parasites.
Swaroop Peddiraju, Rakhee Lohia, Nishith Gupta   +2 more
wiley   +1 more source

TOP1MT rs2293925 is an enhancer‐active regulatory SNP that shapes mitochondrial R‐loop dynamics

The FEBS Journal, EarlyView.
This study shows how a common genetic variant of mitochondrial topoisomerase 1 (TOP1MT rs2293925) can influence mitochondrial gene regulation, DNA topology, and formation of noncanonical nucleic acid structures such as R‐loops. By linking this enhancer‐active variant to mitochondrial nucleic acid stress in cellular contexts relevant to amyotrophic ...
Dóra Varga, Zsolt Ráduly, Beáta Boros‐Oláh, Éva Nagy, Zsolt Karányi, László Halász, Bálint László Bálint, György Vámosi, Emese Tóth, Péter Bai, Serena Santangelo, Patrizia Bossolasco, Antonia Ratti, Vincent Géli, Yves Pommier, Lóránt Székvölgyi   +15 more
wiley   +1 more source