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The sugar pucker which determines the shape of the a-helix, whether the helix will exist in the A-form or in the B-form, occurs at the C2'-endo. [13] A-DNA, is a form of the DNA duplex observed under dehydrating conditions. It is shorter and wider than B-DNA. RNA adopts this double helical form, and RNA-DNA duplexes are mostly A-form, but B ...
In one study, the characteristic C3'-endo pucker is found on the first three sugars of the DNA strand, while the last three sugars have a C2'-endo pucker, like B-DNA. [2] These intermediates can form in aqueous solutions when the cytosine bases are methylated or brominated, altering the conformation.
In aqueous solution, deoxyribose primarily exists as a mixture of three structures: the linear form H−(C=O)−(CH 2)−(CHOH) 3 −H and two ring forms, deoxyribofuranose ("C3′-endo"), with a five-membered ring, and deoxyribopyranose ("C2′-endo"), with a six-membered ring. The latter form is predominant (whereas the C3′-endo form is ...
Haplogroup C-M217, also known as C2 (and previously as C3), [1] is a Y-chromosome DNA haplogroup.It is the most frequently occurring branch of the wider Haplogroup C (M130). ). It is found mostly in Central Asia, Eastern Siberia and significant frequencies in parts of East Asia and Southeast Asia including some populations in the Caucasus, Middle East, South Asia, East Eur
The double-helix model of DNA structure was first published in the journal Nature by James Watson and Francis Crick in 1953, [6] (X,Y,Z coordinates in 1954 [7]) based on the work of Rosalind Franklin and her student Raymond Gosling, who took the crucial X-ray diffraction image of DNA labeled as "Photo 51", [8] [9] and Maurice Wilkins, Alexander Stokes, and Herbert Wilson, [10] and base-pairing ...
The Z-DNA structure. Proteopedia Z-DNA. Z-DNA is one of the many possible double helical structures of DNA.It is a left-handed double helical structure in which the helix winds to the left in a zigzag pattern, instead of to the right, like the more common B-DNA form.
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C-DNA, also known as C-form DNA, is one of many possible double helical conformations of DNA. DNA can be induced to take this form in particular conditions such as relatively low humidity and the presence of certain ions , such as Li + or Mg 2+ , but C-form DNA is not very stable and does not occur naturally in living organisms.