Purine Pyrimidine
Purine Pyrimidine - Related Videos
05:01
Extracellular Purine Metabolism: An HPLC-based Assay to Measure Adenosine Generation and Metabolism in Leukemic Cells
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2023
This video explains a quantitative reverse phase high-performance liquid chromatography (RP-HPLC) method to measure metabolism of adenosine and associated purines generated by consumption of AMP in extracellular environment of leukemic cancer cells. The protocol describes a sensitive, specific, reliable and reproducible RP-HPLC assay developed and validated for the quantification of extracellular purine nucleotides and nucleosides produced by purified chronic lymphocytic leukemia (CLL) cells...
02:27
DNA Base Pairing
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2020
Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule, the amount of adenine (A) is equal to the amount of thymine (T); the amount of guanine (G) is equal to the amount of cytosine (C); and the sum of purines, A and G, is equal to the sum of pyrimidines, C and T (i.e., A+G = C+T). Later work by Watson and Crick revealed that in double-stranded DNA, A always forms two hydrogen bonds...
00:49
Ligand Binding and Linkage
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2020
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence the...
02:26
tRNA Activation
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2020
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
08:37
Use of the Pyrimidine Analog, 5-Iodo-2′-Deoxyuridine (IdU) with Cell Cycle Markers to Establish Cell Cycle Phases in a Mass Cytometry Platform
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Cited by 1 •
2021
This protocol adapts cell cycle measurements for use in a mass cytometry platform. With the multi-parameter capabilities of mass cytometry, direct measurement of iodine incorporation allows identification of cells in S-phase while intracellular cycling markers enable characterization of each cell cycle state in a range of experimental conditions.
FAQs
Delocalized electrons stabilize the aromatic heterocyclic frameworks while helping position hydrogen-bond donors and acceptors for selective recognition. These electronic features allow adenine, guanine, cytosine, thymine, and uracil to interact in defined pairing patterns rather than randomly. The resulting molecular selectivity is central to explaining how nucleic acids maintain recognizable chemical structures and stability.
The fused six- and five-membered ring system gives purines a larger, distinct aromatic framework than the single six-membered ring found in pyrimidines. This structural difference affects the placement of reactive and recognition sites, allowing adenine and guanine to participate in complementary interactions with pyrimidine bases. Consequently, ring architecture helps determine pairing behavior within nucleic acids.
Purine and pyrimidine chemistry extends beyond information storage because these bases also occur in molecules involved in essential cellular reactions. ATP, which contains a purine-derived base, participates in energy transfer. Studying the associated heterocyclic structure helps connect molecular recognition and nucleotide chemistry with the chemical processes that support cellular activity.
Their hydrogen-bond donors and acceptors create selective interactions between complementary bases, while their aromatic, electron-delocalized structures contribute to organized molecular frameworks. Together, these properties help explain why DNA and RNA can maintain stable yet chemically recognizable arrangements. Comparing the base types also clarifies how nucleic acid composition influences molecular interactions and structural behavior.
These compounds provide useful chemical systems for examining distinctive reactivity and molecular recognition. Their different ring architectures and strategically positioned hydrogen-bonding sites create identifiable patterns of interaction that can be investigated analytically. Such studies support the broader characterization of nucleic-acid-related molecules and help connect measured chemical behavior with molecular structure.
Pharmaceutical design can draw on the selective recognition and distinctive reactivity of purine and pyrimidine frameworks. Their organized hydrogen-bonding patterns provide chemically meaningful sites for molecular interactions, while their different ring systems offer contrasting structural platforms. For this reason, these compounds serve as relevant chemical models when designing or studying molecules associated with biological recognition.