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Ribose can either be a five membered ring or a six membered ring . The furanose form is more useful for cells, as it can be used in other reactions. For most cells, ribose is transported into the cell in the pyranose form. With this said, D-Ribose Pyranase needs to be present to convert the pyranose form into the furanose form.
If reaction is between the C-4 hydroxyl and the aldehyde, a furanose is formed instead. [1] The pyranose form is thermodynamically more stable than the furanose form, which can be seen by the distribution of these two cyclic forms in solution. [2] Formation of pyranose hemiacetal and representations of β-D-glucopyranose
Specify the ring size (furanose, pyranose etc.) and anomeric configuration (a or b). State the chain length only in situation where –OH is replaced with H. Alphabetize all the substituent groups (deoxy, -iodo, -amino etc.). Di-, tri- etc. prefixes do not count. Examples
The chemical structure of ribose in its furanose form. The wavy bond indicates a mixture of β-ribofuranose and α-ribofuranose. The furanose ring is a cyclic hemiacetal of an aldopentose or a cyclic hemiketal of a ketohexose. A furanose ring structure consists of four carbon and one oxygen atom with the anomeric carbon to
In these abbreviated forms, the names of the monosaccharide units are shortened to their corresponding three-letter abbreviations, followed by p for pyranose or f for furanose ring structures, with the abbreviated aglyconic alcohol placed at the end of the name. [2]
Both types of pentoses in DNA and RNA are in their β-furanose (closed five-membered ring) form and they define the identity of a nucleic acid. DNA is defined by containing 2'-deoxy-ribose nucleic acid while RNA is defined by containing ribose nucleic acid.
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A furanose (sugar-ring) molecule with carbon atoms labeled using standard notation. The 5′ is upstream; the 3′ is downstream. DNA and RNA are synthesized in the 5′-to-3′ direction. Directionality, in molecular biology and biochemistry, is the end-to-end chemical orientation of a single strand of nucleic acid.
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