Group:SMART:2010 Pingry SMART Team: Difference between revisions
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==='''Inherent dual cofactor use, Xylose reductase'''=== | ==='''Inherent dual cofactor use, Xylose reductase'''=== | ||
Xylose reductase is an unusual protein from the aldo-keto reductase superfamily in that the wild type is able to efficiently utilize both NADH and NADPH in its reduction of the 5 carbon sugar xylose into xylitol. Normally found in the yeast ''Candida tenuis'', it functions biologically as a homodimer unlike the majority of AKR proteins. While Dr. Banta is not actively researching this protein, Xylose Reductase's dual substrate specificity has influenced his engineering of AdhD. Because of its ability to change the conformation of two major loops, which enable different side chain conformations, Xylose Reductase can accomodate both the presence and absence of a phosphate in the cofactor. | Xylose reductase is an unusual protein from the aldo-keto reductase superfamily in that the wild type is able to efficiently utilize both NADH and NADPH in its reduction of the 5 carbon sugar xylose into xylitol. Normally found in the yeast ''Candida tenuis'', it functions biologically as a homodimer unlike the majority of AKR proteins. While Dr. Banta is not actively researching this protein, Xylose Reductase's dual substrate specificity has influenced his engineering of AdhD. Because of its ability to change the conformation of two major loops, which enable different side chain conformations, Xylose Reductase can accomodate both the presence and absence of a phosphate in the cofactor. | ||
<applet load='1K8C_chainD.pdb' size='400' frame='true' align='left' caption='1k8c, Xylose reductase with NADP+' scene='2010_Pingry_SMART_Team/1k8c_default/2'/> | <applet load='1K8C_chainD.pdb' size='400' frame='true' align='left' caption='1k8c, Xylose reductase with NADP+' scene='2010_Pingry_SMART_Team/1k8c_default/2'/> | ||
====PDB ID: 1k8c, Xylose reductase with NADP+==== | ====PDB ID: 1k8c, Xylose reductase with NADP+==== | ||
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== Substrate specificity == | == Substrate specificity == | ||
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A key component of Dr. Banta’s work is engineering AdhD to accept a broad range of substrates. This is a crucial component of his work, because this enzyme will be required to act upon a wide range of substrates when it is used within a practical biofuel cell. Rat liver 3-alpha-hydroxysteroid dihydrodiol dehydrogenase demonstrates how an enzyme is specific to certain substrates and therefore help show what might be done to broaden the specificity of an enzyme. The function of this enzyme within the rat liver is to regulate/ inactivate steroid hormones. The enzyme does this is by reducing the steroid’s (testosterone) C3 ketone group. The interactions within the active site and testosterone are very specific, because of the structure and positioning of the residues within the cavity. This information is important, because it will help show what might be done to adhd to broaden its substrate specificity. | A key component of Dr. Banta’s work is engineering AdhD to accept a broad range of substrates. This is a crucial component of his work, because this enzyme will be required to act upon a wide range of substrates when it is used within a practical biofuel cell. Rat liver 3-alpha-hydroxysteroid dihydrodiol dehydrogenase demonstrates how an enzyme is specific to certain substrates and therefore help show what might be done to broaden the specificity of an enzyme. The function of this enzyme within the rat liver is to regulate/ inactivate steroid hormones. The enzyme does this is by reducing the steroid’s (testosterone) C3 ketone group. The interactions within the active site and testosterone are very specific, because of the structure and positioning of the residues within the cavity. This information is important, because it will help show what might be done to adhd to broaden its substrate specificity. | ||
<applet load='1LWI_chainA.pdb' size='400' frame='true' align='left' caption='1lwi, Rat liver 3-alpha-hydroxysteroid dihydrodiol dehydrogenase with NADP+ cofactor' scene='2010_Pingry_SMART_Team/1lwi_default/6'/> | <applet load='1LWI_chainA.pdb' size='400' frame='true' align='left' caption='1lwi, Rat liver 3-alpha-hydroxysteroid dihydrodiol dehydrogenase with NADP+ cofactor' scene='2010_Pingry_SMART_Team/1lwi_default/6'/> | ||
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Rat liver 3-alpha-hydroxysteroid dihydrodiol dehydrogenase is often abbreviated to 3α-HSD. | Rat liver 3-alpha-hydroxysteroid dihydrodiol dehydrogenase is often abbreviated to 3α-HSD. | ||
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