structure of DNA — LLMpedia

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Structure of DNA. The discovery of the structure of DNA is attributed to James Watson, Francis Crick, and Rosalind Franklin, who worked at Cambridge University and King's College London. Their work built upon earlier research by Friedrich Miescher, Phoebus Levene, and Erwin Chargaff, and was influenced by the X-ray crystallography techniques developed by William Henry Bragg and William Lawrence Bragg at the University of Cambridge and University College London. The understanding of DNA structure has been further advanced by researchers such as Linus Pauling at California Institute of Technology and Alexander Todd at University of Cambridge.

Introduction to DNA Structure

The structure of DNA is a complex molecule that consists of nucleotides linked together by phosphodiester bonds, as described by Levene and Chargaff at Columbia University and Columbia University Medical Center. The double helix model, proposed by Watson and Crick at Cambridge University, suggests that DNA is composed of two complementary strands that are twisted together, with sugar-phosphate backbones on the outside and nitrogenous bases on the inside, similar to the alpha helix structure proposed by Pauling at California Institute of Technology. This model was influenced by the work of John Kendrew and Max Perutz at Cambridge University and Laboratory of Molecular Biology. The structure of DNA has been studied using various techniques, including X-ray crystallography developed by Henry Lipson and William Cochran at University of Manchester and University of Cambridge, and electron microscopy developed by Ernst Ruska at Siemens and University of Berlin.

The chemical composition of DNA includes deoxyribose sugar, phosphate groups, and nitrogenous bases such as adenine, guanine, cytosine, and thymine, as identified by Levene and Chargaff at Columbia University and Columbia University Medical Center. The nucleotides are linked together by phosphodiester bonds to form a polynucleotide chain, as described by Todd at University of Cambridge. The sugar-phosphate backbone of DNA is negatively charged, which allows it to interact with positively charged histone proteins in the nucleosome, as studied by Roger Kornberg at Stanford University and Harvard University. The chemical composition of DNA has been studied by researchers such as Melvin Calvin at University of California, Berkeley and University of Minnesota, and Severo Ochoa at New York University and Roche Institute of Molecular Biology.

The double helix model of DNA, proposed by Watson and Cick at Cambridge University, suggests that DNA is composed of two complementary strands that are twisted together, with sugar-phosphate backbones on the outside and nitrogenous bases on the inside, similar to the alpha helix structure proposed by Pauling at California Institute of Technology. The double helix model was influenced by the work of John Kendrew and Max Perutz at Cambridge University and Laboratory of Molecular Biology, and was supported by X-ray crystallography data from Rosalind Franklin and Maurice Wilkins at King's College London. The double helix model has been widely accepted and has been used to explain many of the properties of DNA, including its ability to replicate and transmit genetic information, as studied by Matthew Meselson and Franklin Stahl at California Institute of Technology and University of Oregon.

The base pairing and stacking of DNA is a critical aspect of its structure, as described by Watson and Crick at Cambridge University. The nitrogenous bases of DNA are paired in a specific manner, with adenine pairing with thymine and guanine pairing with cytosine, as identified by Chargaff at Columbia University. The base pairs are stacked on top of each other, with the sugar-phosphate backbones on the outside, as studied by Karst Hoogsteen at University of California, Los Angeles and University of Groningen. The base pairing and stacking of DNA is influenced by the hydrogen bonding between the nitrogenous bases, as described by Linus Pauling at California Institute of Technology and Alexander Todd at University of Cambridge.

DNA can exist in several different conformations and forms, including the B-DNA form, which is the most common form of DNA in living organisms, as described by Watson and Crick at Cambridge University. Other forms of DNA include A-DNA and Z-DNA, which have different helical structures and base pairing properties, as studied by Richard Dickerson at California Institute of Technology and University of California, Los Angeles. DNA can also exist in a supercoiled form, which is important for its packaging in the nucleus of eukaryotic cells, as described by Aaron Klug at Cambridge University and Medical Research Council. The different conformations and forms of DNA have been studied by researchers such as David Davies at National Institutes of Health and University of Oxford, and Michael Rossmann at Purdue University and University of Illinois at Urbana-Champaign.

The higher-order structure of DNA refers to the organization of DNA into chromatin and chromosomes, as described by Roger Kornberg at Stanford University and Harvard University. The nucleosome is the basic unit of chromatin, and consists of a segment of DNA wrapped around a core of histone proteins, as studied by Don Wiley at Harvard University and University of California, San Francisco. The chromatin is then coiled into a solenoid structure, which is further coiled into a chromosome, as described by Barbara McClintock at Cold Spring Harbor Laboratory and University of Missouri. The higher-order structure of DNA is important for its packaging and regulation in the nucleus of eukaryotic cells, as studied by Eric Wieschaus at Princeton University and University of California, San Diego, and Christian Hannenhalli at University of Pennsylvania and National Institutes of Health. Category:DNA