Inhibiting NAD+-dependent DNA ligase activity with 2-(cyclopentyloxy)-5'-deoxyadenosine (CPOdA) offers a new tool for DNA replication and repair studies in the model archaeon Haloferax volcanii. | LitMetric
DNA ligases play an essential role in many aspects of DNA metabolism in all three domains of life. The haloarchaeal organism Haloferax volcanii encodes both ATP- and NAD(+)-dependent DNA ligase enzymes designated LigA and LigN, respectively. Neither LigA nor LigN alone is required for cell viability but they share an essential function, most likely the ligation of Okazaki fragments during chromosome replication. Here we show that 2-(cyclopentyloxy)-5'-deoxyadenosine (referred to as CPOdA), originally developed as a inhibitor of bacterial NAD(+)-dependent DNA ligases, is a potent inhibitor of the growth of Hfx. volcanii cells expressing LigN alone, causing chromosome fragmentation and cell death, while cells expressing LigA are unaffected. Growth inhibition occurs at significantly lower CPOdA concentrations (MIC ≤ 50 ng ml(-1)) than those required for inhibition of bacterial growth (≥2 μg ml(-1)). CPOdA has the potential to become a vital tool in DNA replication and repair studies in this important model organism.
Background And Objective: Mitochondria are important organelles functioning in metabolic processes, inflammatory response and neurological disorders. Migraines are chronic and paroxysmal neurological disorders characterized by recurrent episodes of severe headache and other neurological symptoms. We explored whether mitochondria may be genetically and/or causally associated with migraine.
Calorie restriction (CR), as a dietary approach of reducing caloric intake while maintaining nutritional adequacy, has gained significant attention due to its potential role in promoting longevity and enhancing health. Central to the beneficial effects of CR is SIRT1. SIRT1 belongs to a family of NAD+ dependent deacetylases and plays an important role in regulating various cellular processes, including histone deacetylation, oxidative stress response, and mitochondrial biogenesis.
The efficacy of assisted reproductive technologies (ARTs) in older women remains constrained, largely due to an incomplete understanding of the underlying pathophysiology. This review aims to consolidate the current knowledge on age-associated mitochondrial alterations and their implications for ovarian aging, with an emphasis on the causes of mitochondrial DNA (mtDNA) mutations, their repair mechanisms, and future therapeutic directions. Relevant articles published up to 30 September 2024 were identified through a systematic search of electronic databases.
- The study introduces Bacillus enclensis AGM_Cr8, a marine bacterium found in polluted Versova Creek, Mumbai, that displays significant tolerance to chromate stress and other heavy metals such as lead and arsenic.
- Various microscopic techniques show how AGM_Cr8 absorbs chromate, with evidence of both surface interaction and internal bioaccumulation, suggesting a bioreduction mechanism that converts harmful Cr(VI) into less toxic Cr(III).
- Genome sequencing reveals twenty-two genes related to chromate tolerance and detoxification processes, indicating AGM_Cr8's potential for bioremediation of chromium contamination in the environment.
Despite the loss of melanocytes, individuals with vitiligo have a significantly lower risk of developing skin malignancies compared to ethnicity-matched controls. The study investigated the molecular mechanisms that protect skin cells (keratinocytes) from UV-B-induced DNA damage in individuals with vitiligo. The study found that upregulation of stem cell factor (SCF) signaling significantly reduced γ-H2AX positivity and cyclobutane pyrimidine dimer formation and improved mitochondrial health (elongated mitochondria, reduced reactive oxygen species [ROS] and lipid peroxidation) in keratinocytes upon UV-B exposure.
