1,4 glycosidic bonds: Difference between revisions
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Description of 1,4-glycosidic bonds |
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A 1,4-glycosidic bond is a covalent bond between the -OH group on carbon 1 of one sugar and | A 1,4-glycosidic bond is a covalent bond between the -OH group on [[carbon|carbon]] 1 of one sugar and the -OH group on carbon 4 of another [[sugar|sugar]]. This is a [[condensation reaction|condensation reaction]] as a [[molecule|molecule]] of [[water|water]] is released. It can be broken by consuming a molecule of water in a [[hydrolysis reaction|hydrolysis reaction]] <ref>Bruce, A., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P. (2008). Molecular Biology of the Cell. 5th ed. New York: Garland Science. 56-57.</ref>. The bond can either be in the α or β form depending on the position of the [[hydroxyl group|hydroxyl group]] on the carbon 1 involved in the bond. The α-1,4-glycosidic bond has the hydroxyl group pointing down. The β-1,4-glycosidic bond has the hydroxyl group pointing up <ref>Bruce, A., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P. (2008). Molecular Biology of the Cell. 5th ed. New York: Garland Science. 113.</ref>. 1,4-glycosidic bonds can be found in both [[amylase|amylase]] and [[amylopectin|amylopectin]] in [[glycogen|glycogen]]. These linkages create branching in the [[polysaccharide|polysaccharide]]. Amylopectin and amylase are both readily hydrolysed by the [[α-amylase|α-amylase]] enzyme <ref>Berg JM, Tymoczko JL, Stryer L. (2002). Biochemistry. 5th ed. New York: W H Freeman. Section 11.2.2.</ref>. | ||
1,4-glycosidic bonds can be found in both amylase and amylopectin in glycogen. These linkages create branching in the polysaccharide. Amylopectin and amylase are both readily hydrolysed by the α-amylase enzyme. | |||
References | === References === | ||
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Revision as of 02:53, 24 November 2014
A 1,4-glycosidic bond is a covalent bond between the -OH group on carbon 1 of one sugar and the -OH group on carbon 4 of another sugar. This is a condensation reaction as a molecule of water is released. It can be broken by consuming a molecule of water in a hydrolysis reaction [1]. The bond can either be in the α or β form depending on the position of the hydroxyl group on the carbon 1 involved in the bond. The α-1,4-glycosidic bond has the hydroxyl group pointing down. The β-1,4-glycosidic bond has the hydroxyl group pointing up [2]. 1,4-glycosidic bonds can be found in both amylase and amylopectin in glycogen. These linkages create branching in the polysaccharide. Amylopectin and amylase are both readily hydrolysed by the α-amylase enzyme [3].
References
- ↑ Bruce, A., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P. (2008). Molecular Biology of the Cell. 5th ed. New York: Garland Science. 56-57.
- ↑ Bruce, A., Johnson, A., Lewis, J., Raff, M., Roberts, K. and Walter, P. (2008). Molecular Biology of the Cell. 5th ed. New York: Garland Science. 113.
- ↑ Berg JM, Tymoczko JL, Stryer L. (2002). Biochemistry. 5th ed. New York: W H Freeman. Section 11.2.2.