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| | {{STRUCTURE_1hld| PDB=1hld | SCENE= }} | | {{STRUCTURE_1hld| PDB=1hld | SCENE= }} |
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| - | '''STRUCTURES OF HORSE LIVER ALCOHOL DEHYDROGENASE COMPLEXED WITH NAD+ AND SUBSTITUTED BENZYL ALCOHOLS'''
| + | ===STRUCTURES OF HORSE LIVER ALCOHOL DEHYDROGENASE COMPLEXED WITH NAD+ AND SUBSTITUTED BENZYL ALCOHOLS=== |
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| - | ==Overview==
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| - | Structures of the enzyme complexed with NAD+ and 2,3,4,5,6-pentafluorobenzyl alcohol were determined by X-ray crystallography at a resolution of 2.1 A and to a refinement R value of 18.3% for a monoclinic (P2(1)) form and to 2.4 A and an R value of 18.9% for a triclinic crystal form. The pentafluorobenzyl alcohol does not react, due to electron withdrawal by the fluorine atoms. A structure with NAD+ and p-bromobenzyl alcohol in the monoclinic form was also determined at 2.5 A and an R value of 16.7%. The conformations of the subunits in the monoclinic and triclinic crystal forms are very similar. The dimer is the asymmetric unit, and a rigid body rotation closes the cleft between the coenzyme and catalytic domains upon complex formation. In the monoclinic form, this conformational change is described by a rotation of 9 degrees in one subunit and 10 degrees in the other. The pentafluoro- and p-bromobenzyl alcohols bind in overlapping positions. The hydroxyl group of each alcohol is ligated to the catalytic zinc and participates in an extensive hydrogen-bonded network that includes the imidazole group of His-51, which can act as a base and shuttle a proton to solvent. The hydroxymethyl carbon of the pentafluorobenzyl alcohol is 3.4 A from C4 of the nicotinamide ring, and the pro-R hydrogen is in a good position for direct transfer to C4. The p-bromobenzyl alcohol may react after small rotations around single bonds of the alcohol. These structures should approximate the active Michaelis-Menten complexes.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_8172897}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 8172897 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_8172897}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Plapp, B V.]] | | [[Category: Plapp, B V.]] |
| | [[Category: Ramaswamy, S.]] | | [[Category: Ramaswamy, S.]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 18:58:54 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 08:21:28 2008'' |
Revision as of 05:21, 1 July 2008
Template:STRUCTURE 1hld
STRUCTURES OF HORSE LIVER ALCOHOL DEHYDROGENASE COMPLEXED WITH NAD+ AND SUBSTITUTED BENZYL ALCOHOLS
Template:ABSTRACT PUBMED 8172897
About this Structure
1HLD is a Single protein structure of sequence from Equus caballus. Full crystallographic information is available from OCA.
Reference
Structures of horse liver alcohol dehydrogenase complexed with NAD+ and substituted benzyl alcohols., Ramaswamy S, Eklund H, Plapp BV, Biochemistry. 1994 May 3;33(17):5230-7. PMID:8172897
Page seeded by OCA on Tue Jul 1 08:21:28 2008
