Articles tagged with Dna Polymerases
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A study published in Science reveals that a molecule called ppGpp enables bacteria to repair damage to their DNA, including that caused by antibiotics. Adjusting the action of ppGpp may make bacteria more vulnerable to existing antibiotics, potentially yielding future solutions for antibiotic resistance and degenerative diseases.
The study provides unprecedented molecular views of the critical early events in gene expression, positioning RNA polymerase to start transcription. The researchers captured human PICs in three functional states, revealing new structural elements and insights into DNA engagement, promoter melting, and transcription bubble stabilization.
The CHOP/Rutgers team developed new experimental approaches to detect DNA scrunching during transcription start site selection. They identified the TSS, front and rear positions where RNA polymerase attached to DNA, and found that as the position of the TSS changes, the position of the enzyme's leading edge changes in lock step.
The project aims to analyze core replication complexes crucial for repairing damaged DNA and understanding cancer initiation and progression. The study may lead to insights into human health and disease, particularly cancer susceptibility.
Researchers have produced the first-ever images of the protein complex that unwinds, splits, and copies double-stranded DNA, revealing a counterintuitive architecture. The helicase coordinates with polymerases to duplicate each strand, suggesting potential molecular quality control and developmental biology implications.
A team of researchers has revealed the molecular architecture of the replisome, a complex responsible for unwinding and replicating DNA in eukaryotic organisms. The findings show that the replisome has a unique structure, with one polymerase sitting above the helicase, challenging decades-old textbook drawings.
Researchers at Lomonosov Moscow State University discovered a new DNA repair mechanism that can detect and fix single-stranded breaks in histone-bound DNA. This breakthrough opens up new avenues for treating neurodegenerative diseases such as Alzheimer's.
Researchers discovered how elongin A morphs between roles as facilitator and destroyer in response to stress and DNA damage. This understanding sheds light on diseases like cancer where genes are improperly turned on or off.
A study published in Nature Structural & Molecular Biology reveals that human DNA polymerase theta may be a promising drug therapy target for inhibiting breast cancer. The researchers used X-ray crystallography to determine the first crystal structures of POLQ, providing insights into its role in DNA repair and genomic instability.
Researchers develop a technique to label and track new DNA pieces, revealing hotspots for genetic flaws. These sites are crucial regulatory switches that can lead to genetic diseases or cancer.
Scientists at Washington State University have discovered a critical step in the DNA repair process that could lead to new therapies for hereditary diseases. They found that a specific protein must be 'unbuckled' to allow easy access for the DNA repair crew, and this discovery may lead to targeted gene therapy.
Researchers discovered a mechanism preventing mutation in genes involves long distance scanning of DNA by Mfd protein, detecting damage within active genes. This discovery sheds light on the complicated genome-wide patterns of mutation underlying species evolution and cell behavior changes.
Researchers at NYU Langone Health discover how RNA polymerase patrols the genome for DNA damage and recruits partners to repair it, leading to fewer mutations and less disease. The study's findings have major implications for our understanding of DNA repair and its role in cancer and aging.
DNA polymerase epsilon's unique P-domain enables it to build long DNA strands without falling off, a crucial property for genome reproduction. The study identifies specific mutations linked to colorectal and cervical cancers, offering insights into their development.
Researchers at EMBL have determined the 3D structure of RNA polymerase I, revealing a unique 'Swiss-army knife' strategy that allows it to produce RNA molecules faster than its counterpart, RNA polymerase II. The protein's larger size and efficiency are due to its built-in modules, which prevent the need for external recruitment.
For the first time, scientists have demystified a key step in human DNA replication by discovering how a sliding clamp loads onto DNA. The research reveals that a clamp loader quickly removes the clamp from DNA when polymerase is absent, allowing the polymerase to capture and complete the assembly of the holoenzyme.
A team of Stanford University bioengineers has created a biological transistor made from genetic material that can compute inside living cells, recording exposure to external stimuli or environmental factors. The transcriptor enables amplifying genetic logic, allowing engineers to monitor environments and improve cellular therapeutics.
Scientists at Arizona State University have discovered an enzyme that allows DNA sequences to be transcribed into a simpler molecule called TNA, which can then be reverse-transcribed back into DNA. This breakthrough offers clues about the origins of genetic code and has potential applications in molecular medicine.
A new paper in Cell Reports found that paused RNA polymerase plays a crucial role in regulating gene expression during embryonic development. The study revealed that the paused state is regulated over time rather than by tissue type, and that proteins called Polycomb group help keep it in check.
A pilot study of six patients with chronic fatigue syndrome detected specific antibodies linked to latent Epstein-Barr virus reactivation, which responded to antiviral treatment. The researchers plan to develop a clinical laboratory test to detect these antibodies in blood samples, offering a potential breakthrough in diagnosis.
The study determines the three-dimensional structure of the transcription initiation complex, revealing how the molecular machine recognizes and binds to specific sites on DNA. This breakthrough provides a foundation for understanding bacterial transcription initiation and developing new antibacterial agents.
Researchers at Stowers Institute for Medical Research reveal that histone exchange occurs over a large proportion of genes, controlling gene expression. They also find that the Set2 protein plays a complex role in regulating transcription, preventing cryptic RNA transcripts and maintaining chromosomal stability.
The National Institute of General Medical Sciences (NIGMS) is honoring its 50th anniversary with a symposium showcasing research advancements in disease diagnosis, treatment, and prevention. NIGMS has funded over 74 Nobel laureates and supports research training programs to foster the next generation of scientists.
A team of microbiologists at UMass Amherst has made an advance in understanding the replication of parasites like African sleeping sickness and chagas disease. By characterizing key proteins' organization, they discovered a novel mechanism that could lead to the development of new treatments.
Scientists at Scripps Research Institute discover that unnatural DNA bases can replicate efficiently, suggesting an expanded genetic alphabet could carry more information. The finding has implications for the origins of life and the development of novel molecular tools.
Researchers have discovered that six unnatural nucleic acid polymers can share information with DNA, shedding light on the origins of life. The discovery opens up practical applications for molecular medicine, including new diagnostics and therapeutics.
Indiana University researchers have discovered that specific types of RNA polymerase enzymes differ in function based on variation in their protein subunits. This finding reveals the importance of subunit composition in selecting which genes are silenced or expressed, with implications for understanding genetic disorders and diseases.
Researchers have determined the architecture of the mitochondrial RNA polymerase, revealing its molecular copy machine mechanism. The discovery provides new insights into the evolution of mitochondria and their genome, shedding light on how they produce energy for cells.
Researchers at NYU Langone Health have discovered the cellular mechanisms that generate chromosomal breaks in bacteria. They found that collisions between major gene expression lead to chromosomal breaks, which may explain stress-driven evolution in bacteria and certain human diseases.
Researchers at Ohio State University identified a family of proteins that close a critical gap in RNA polymerase, enabling it to maintain its grip on DNA and activate genes. This discovery has implications for antibiotic development and could contribute to understanding gene expression in all living organisms.
Researchers have discovered that MED26 acts as a go-between linking transcriptional complexes, recruiting elongation factors to DNA to jump-start stalled polymerase. This discovery sheds light on the regulation of gene expression and suggests new strategies for regulating gene expression in healthy and diseased cells.
A Berkeley Lab-led team has solved the structure of human FEN1, a key player in DNA replication and repair. The study reveals how FEN1 binds to DNA, opens it by severely bending the template strand, and prepares flaps for joining to new fragments.
Research reveals that protein collisions during DNA replication can lead to errors and increase cancer risk. The study found that even head-on collisions between the 'fast train' of DNA replisome and the 'slow train' of RNA polymerase can cause damage.
A new JACS paper demonstrates continuous and controlled translocation of a single-stranded DNA polymer through a protein nanopore using a DNA polymerase enzyme. This achievement advances the development of Strand Sequencing using nanopores, a crucial component of molecular motors.
Researchers at MIT identified a new cancer drug target by shutting down an enzyme that controls DNA repair, which can enhance the effectiveness of traditional chemotherapy drugs. The findings suggest that inhibiting this enzyme may help treat difficult cancers resistant to ordinary treatments and prevent drug resistance.
Researchers at University of Maryland provide new insight into the initiation phase of bacterial gene transcription, showing a three-step process involving RNA polymerase and DNA bending. The study confirms experimental observations and establishes an active role for RNA polymerase in the process.
Researchers find DNA polymerase theta promotes inaccurate DNA repair process that can cause mutations and cancer. The discovery could lead to the development of new cancer drugs targeting the protein.
Researchers at Mount Sinai School of Medicine discovered that DNA polymerase eta, an enzyme helping cells replicate despite sun damage, is structured differently in people with XPV. This finding sets the stage for research into therapies to protect XPV patients from skin cancers.
Researchers at IGBMC have developed an 'image-by-image' analysis technique to study the 3D structure of transcription complexes, revealing new insights into the initiation and regulation mechanisms. The study, published in Nature, provides a detailed understanding of the molecular interactions involved in transcription.
Researchers discovered a new factor, DksA, that prevents conflict between DNA replication and transcription in E. coli. When present, DksA tags along with RNA polymerase and removes it from the track when DNA polymerase approaches, allowing for stable replication.
Researchers at Ohio State University observed real-time behavior of an enzyme called Dpo4, a model Y-family enzyme. They defined critical steps in the process and identified unexpected movement that could lead to DNA mistakes. The findings set the stage for studies on DNA copying errors and potential cancer and disease causes.
Researchers at Ludwig-Maximilians-Universität München have detailed the process of RNA polymerase II initiating gene transcription. The complex recognizes signals in the DNA sequence and uses TFIIB to bind to the TATA box, producing a sharp kink in the DNA.
Researchers using optical tweezers directly observed protein machines encountering nucleosomes, leading to halting and backsliding movements. This study provides a detailed insight into the regulation of gene expression through dynamic interactions between proteins and DNA.
Researchers describe an exquisitely efficient process for DNA repair, revealing the key attributes of the 'sloppier copier' enzyme and its crucial role in conserving energy. The study also solves two other mysteries about the mechanics of DNA repair.
A team of researchers at the University of Leeds has developed a model that explains how errors are corrected during protein synthesis. The study suggests that a molecular machine called RNA polymerase uses a unique mechanism to remove incorrect letters from the growing RNA chain, allowing copying to resume.
Researchers have developed a new crosslinking method called TRAP to study protein interactions in living cells. The method uses small crosslinkers that can be controlled with light to identify proteins working together, revealing new details about RNA polymerase in bacteria.
Biologists at Washington University in St. Louis have found that plant enzymes Pol IV and V are specialized forms of RNA Polymerase II, essential for decoding genetic information in eukaryotes. The discovery sheds light on the evolution of RNA polymerases and their role in gene silencing.
Scientists have discovered a new mechanism by which the human immune system adapts to infections, involving 'cluster mutations' in antibody genes. This discovery fills a significant gap in our understanding of how we survive microbial invasions and may lead to new ways to prevent illnesses or make them less dangerous.
A team of researchers has discovered how the N4 phage injects its own RNA polymerase into E. coli bacterial cells, enabling it to create new proteins without host help. The unique property allows for potential therapeutic applications in killing E. coli bacteria.
A team led by Craig Pikaard discovered a new mechanism by which plant cells silence potentially harmful genes, involving the non-coding region of DNA and two plant-specific RNA polymerases. The research has major implications for gene therapy, where RNA-centric approaches show promise for controlling diseases such as cancer and HIV.
Researchers have uncovered the mechanism by which specialized activator proteins kickstart the RNA polymerase machine, allowing genes to be activated at specific times. This process is crucial for protein production and bacterial adaptation, making it a potential target for developing novel antibacterial compounds.
The Shilatifard Lab discovered that ELL plays a critical role in regulating gene expression by causing temporary interruptions of Pol II transcription in fruit flies. This finding has implications for understanding the pathogenesis of childhood leukemia and developing targeted therapeutics.
A new study reveals that RNA polymerase II constantly scans the cell's DNA for damage, sending a stress signal to p53, a master protein that responds to DNA damage. This discovery sheds light on how cells protect themselves against cancer-producing DNA lesions.
DNA polymerase epsilon plays a primary role in replicating leading strand of DNA in bakers yeast, influencing genome stability and responses to environmental stress. The discovery advances understanding of DNA replication in higher organisms like humans.
University of Wisconsin-Madison researchers discovered novel functions of the Sen1 protein, which acts as a master regulatory switch in yeast. This discovery may help understand human neurodegenerative diseases like ALS and movement disorders.
Researchers found that the trigger loop acts like a trap door to close off the active center and form extensive interactions with NTP, ensuring accuracy. This mechanism couples NTP recognition and catalysis, explaining the high fidelity of transcription.
Researchers at Ohio State University have discovered a novel mechanism used by the DNA repair protein, DNA polymerase lambda, to ensure accurate replication and repair of DNA. The protein utilizes an unexpected structure, known as the proline-rich domain, which is critical to its high fidelity despite initial concerns about error rates.
Scientists from the University of Wisconsin-Madison have made a fundamental discovery about RNA synthesis in E. coli, shedding light on how bacteria regulate gene expression. The study found that a specific region within DNA promoters makes contact with RNA polymerase, but not at promoters for genes involved in ribosomal RNA production.
Researchers found a molecular mechanism that regulates careless DNA polymerases, preventing excessive mutations and cancer risk. The p53 and p21 proteins act as supervisors, controlling the careless enzymes' activities.
DinB DNA polymerase is specialized for proficiently replicating damaged G nucleotides, allowing cells to tolerate DNA damage and preventing cancer. The enzyme's unique ability is essential for survival, as mutations can render it inactive.