1teh
From Proteopedia
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==Overview== | ==Overview== | ||
| - | The crystal structure of the human class III chi chi alcohol dehydrogenase, (ADH) in a binary complex with NAD+(gamma) was solved to 2.7 A resolution, by molecular replacement with human class I beta1 beta1 ADH. chi chi ADH, catalyzes the oxidation of long-chain alcohols such as omega-hydroxy fatty, acids as well as S-hydroxymethyl-glutathione, a spontaneous adduct between, formaldehyde and glutathione. There are two subunits per asymmetric unit, in the chi chi ADH structure. Both subunits display a semi-open, conformation of the catalytic domain. This conformation is half-way, between the open and closed conformations described for the horse EE ADH, enzyme. The semi-open conformation and key changes in elements of, secondary structure provide a structural basis for the ability of chi ... | + | The crystal structure of the human class III chi chi alcohol dehydrogenase, (ADH) in a binary complex with NAD+(gamma) was solved to 2.7 A resolution, by molecular replacement with human class I beta1 beta1 ADH. chi chi ADH, catalyzes the oxidation of long-chain alcohols such as omega-hydroxy fatty, acids as well as S-hydroxymethyl-glutathione, a spontaneous adduct between, formaldehyde and glutathione. There are two subunits per asymmetric unit, in the chi chi ADH structure. Both subunits display a semi-open, conformation of the catalytic domain. This conformation is half-way, between the open and closed conformations described for the horse EE ADH, enzyme. The semi-open conformation and key changes in elements of, secondary structure provide a structural basis for the ability of chi chi, ADH to bind S-hydroxymethyl-glutathione and 10-hydroxydecanoate. Direct, coordination of the catalytic zinc ion by Glu68 creates a novel, environment for the catalytic zinc ion in chi chi ADH. This new, configuration of the catalytic zinc is similar to an intermediate for, horse EE ADH proposed through theoretical computations and is consistent, with the spectroscopic data of the Co(II)-substituted chi chi enzyme. The, position for residue His47 in the chi chi ADH structure suggests His47 may, function both as a catalytic base for proton transfer and in the binding, of the adenosine phosphate of NAD(H). Modeling of substrate binding to, this enzyme structure is consistent with prior mutagenesis data which, showed that both Asp57 and Arg115 contribute to glutathione binding and, that Arg115 contributes to the binding of omega-hydroxy fatty acids and, identifies additional residues which may contribute to substrate binding. |
==About this Structure== | ==About this Structure== | ||
| - | 1TEH is a | + | 1TEH is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] with ZN and NAD as [http://en.wikipedia.org/wiki/ligands ligands]. Structure known Active Sites: ZN1, ZN2, ZN3, ZN4 and ZNS. Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1TEH OCA]. |
==Reference== | ==Reference== | ||
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[[Category: nad+ dependent alcohol dehydrogenase glutathione dependent formaldehyde dehydrogenase]] | [[Category: nad+ dependent alcohol dehydrogenase glutathione dependent formaldehyde dehydrogenase]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Mon Nov 5 14:37:28 2007'' |
Revision as of 12:32, 5 November 2007
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STRUCTURE OF HUMAN LIVER CHICHI ALCOHOL DEHYDROGENASE (A GLUTATHIONE-DEPENDENT FORMALDEHYDE DEHYDROGENASE)
Overview
The crystal structure of the human class III chi chi alcohol dehydrogenase, (ADH) in a binary complex with NAD+(gamma) was solved to 2.7 A resolution, by molecular replacement with human class I beta1 beta1 ADH. chi chi ADH, catalyzes the oxidation of long-chain alcohols such as omega-hydroxy fatty, acids as well as S-hydroxymethyl-glutathione, a spontaneous adduct between, formaldehyde and glutathione. There are two subunits per asymmetric unit, in the chi chi ADH structure. Both subunits display a semi-open, conformation of the catalytic domain. This conformation is half-way, between the open and closed conformations described for the horse EE ADH, enzyme. The semi-open conformation and key changes in elements of, secondary structure provide a structural basis for the ability of chi chi, ADH to bind S-hydroxymethyl-glutathione and 10-hydroxydecanoate. Direct, coordination of the catalytic zinc ion by Glu68 creates a novel, environment for the catalytic zinc ion in chi chi ADH. This new, configuration of the catalytic zinc is similar to an intermediate for, horse EE ADH proposed through theoretical computations and is consistent, with the spectroscopic data of the Co(II)-substituted chi chi enzyme. The, position for residue His47 in the chi chi ADH structure suggests His47 may, function both as a catalytic base for proton transfer and in the binding, of the adenosine phosphate of NAD(H). Modeling of substrate binding to, this enzyme structure is consistent with prior mutagenesis data which, showed that both Asp57 and Arg115 contribute to glutathione binding and, that Arg115 contributes to the binding of omega-hydroxy fatty acids and, identifies additional residues which may contribute to substrate binding.
About this Structure
1TEH is a Single protein structure of sequence from Homo sapiens with ZN and NAD as ligands. Structure known Active Sites: ZN1, ZN2, ZN3, ZN4 and ZNS. Full crystallographic information is available from OCA.
Reference
Structure of human chi chi alcohol dehydrogenase: a glutathione-dependent formaldehyde dehydrogenase., Yang ZN, Bosron WF, Hurley TD, J Mol Biol. 1997 Jan 24;265(3):330-43. PMID:9018047
Page seeded by OCA on Mon Nov 5 14:37:28 2007
