1htb: Difference between revisions
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'''CRYSTALLIZATION OF HUMAN BETA3 ALCOHOL DEHYDROGENASE (10 MG/ML) IN 100 MM SODIUM PHOSPHATE (PH 7.5), 7.5 MM NAD+ AND 1 MM 4-IODOPYRAZOLE AT 25 C'''<br /> | '''CRYSTALLIZATION OF HUMAN BETA3 ALCOHOL DEHYDROGENASE (10 MG/ML) IN 100 MM SODIUM PHOSPHATE (PH 7.5), 7.5 MM NAD+ AND 1 MM 4-IODOPYRAZOLE AT 25 C'''<br /> | ||
==Overview== | ==Overview== | ||
The three-dimensional structure of the human beta3beta3 dimeric alcohol | The three-dimensional structure of the human beta3beta3 dimeric alcohol dehydrogenase (beta3) was determined to 2.4-A resolution. beta3 was crystallized as a ternary complex with the coenzyme NAD+ and the competitive inhibitor 4-iodopyrazole. beta3 is a polymorphic variant at ADH2 that differs from beta1 by a single amino acid substitution of Arg-369 --> Cys. The available x-ray structures of mammalian alcohol dehydrogenases show that the side chain of Arg-369 forms an ion pair with the NAD(H) pyrophosphate to stabilize the E.NAD(H) complex. The Cys-369 side chain of beta3 cannot form this interaction. The three-dimensional structures of beta3 and beta1 are virtually identical, with the exception that Cys-369 and two water molecules in beta3 occupy the position of Arg-369 in beta1. The two waters occupy the same positions as two guanidino nitrogens of Arg-369. Hence, the number of hydrogen bonding interactions between the enzyme and NAD(H) are the same for both isoenzymes. However, beta3 differs from beta1 by the loss of the electrostatic interaction between the NAD(H) pyrophosphate and the Arg-369 side chain. The equilibrium dissociation constants of beta3 for NAD+ and NADH are 350-fold and 4000-fold higher, respectively, than those for beta1. These changes correspond to binding free energy differences of 3.5 kcal/mol for NAD+ and 4.9 kcal/mol for NADH. Thus, the Arg-369 --> Cys substitution of beta3 isoenzyme destabilizes the interaction between coenzyme and beta3 alcohol dehydrogenase. | ||
==Disease== | ==Disease== | ||
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==About this Structure== | ==About this Structure== | ||
1HTB 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, CL, NAD and PYZ as [http://en.wikipedia.org/wiki/ligands ligands]. The following page contains interesting information on the relation of 1HTB with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb13_1.html Alcohol Dehydrogenase]]. Active as [http://en.wikipedia.org/wiki/Alcohol_dehydrogenase Alcohol dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.1 1.1.1.1] Full crystallographic information is available from [http:// | 1HTB 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 <scene name='pdbligand=ZN:'>ZN</scene>, <scene name='pdbligand=CL:'>CL</scene>, <scene name='pdbligand=NAD:'>NAD</scene> and <scene name='pdbligand=PYZ:'>PYZ</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. The following page contains interesting information on the relation of 1HTB with [[http://pdb.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/pdb13_1.html Alcohol Dehydrogenase]]. Active as [http://en.wikipedia.org/wiki/Alcohol_dehydrogenase Alcohol dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.1 1.1.1.1] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HTB OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Homo sapiens]] | [[Category: Homo sapiens]] | ||
[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Davis, G | [[Category: Davis, G J.]] | ||
[[Category: Hurley, T | [[Category: Hurley, T D.]] | ||
[[Category: CL]] | [[Category: CL]] | ||
[[Category: NAD]] | [[Category: NAD]] | ||
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[[Category: nad+ dependent alcohol dehydrogenase]] | [[Category: nad+ dependent alcohol dehydrogenase]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 13:04:37 2008'' | ||
Revision as of 14:04, 21 February 2008
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CRYSTALLIZATION OF HUMAN BETA3 ALCOHOL DEHYDROGENASE (10 MG/ML) IN 100 MM SODIUM PHOSPHATE (PH 7.5), 7.5 MM NAD+ AND 1 MM 4-IODOPYRAZOLE AT 25 C
OverviewOverview
The three-dimensional structure of the human beta3beta3 dimeric alcohol dehydrogenase (beta3) was determined to 2.4-A resolution. beta3 was crystallized as a ternary complex with the coenzyme NAD+ and the competitive inhibitor 4-iodopyrazole. beta3 is a polymorphic variant at ADH2 that differs from beta1 by a single amino acid substitution of Arg-369 --> Cys. The available x-ray structures of mammalian alcohol dehydrogenases show that the side chain of Arg-369 forms an ion pair with the NAD(H) pyrophosphate to stabilize the E.NAD(H) complex. The Cys-369 side chain of beta3 cannot form this interaction. The three-dimensional structures of beta3 and beta1 are virtually identical, with the exception that Cys-369 and two water molecules in beta3 occupy the position of Arg-369 in beta1. The two waters occupy the same positions as two guanidino nitrogens of Arg-369. Hence, the number of hydrogen bonding interactions between the enzyme and NAD(H) are the same for both isoenzymes. However, beta3 differs from beta1 by the loss of the electrostatic interaction between the NAD(H) pyrophosphate and the Arg-369 side chain. The equilibrium dissociation constants of beta3 for NAD+ and NADH are 350-fold and 4000-fold higher, respectively, than those for beta1. These changes correspond to binding free energy differences of 3.5 kcal/mol for NAD+ and 4.9 kcal/mol for NADH. Thus, the Arg-369 --> Cys substitution of beta3 isoenzyme destabilizes the interaction between coenzyme and beta3 alcohol dehydrogenase.
DiseaseDisease
Known diseases associated with this structure: Alcoholism, susceptibility to OMIM:[103720]
About this StructureAbout this Structure
1HTB is a Single protein structure of sequence from Homo sapiens with , , and as ligands. The following page contains interesting information on the relation of 1HTB with [Alcohol Dehydrogenase]. Active as Alcohol dehydrogenase, with EC number 1.1.1.1 Full crystallographic information is available from OCA.
ReferenceReference
X-ray structure of human beta3beta3 alcohol dehydrogenase. The contribution of ionic interactions to coenzyme binding., Davis GJ, Bosron WF, Stone CL, Owusu-Dekyi K, Hurley TD, J Biol Chem. 1996 Jul 19;271(29):17057-61. PMID:8663387
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