1leh
From Proteopedia
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|SITE= | |SITE= | ||
|LIGAND= | |LIGAND= | ||
| - | |ACTIVITY= [http://en.wikipedia.org/wiki/Leucine_dehydrogenase Leucine dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.4.1.9 1.4.1.9] | + | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/Leucine_dehydrogenase Leucine dehydrogenase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.4.1.9 1.4.1.9] </span> |
|GENE= | |GENE= | ||
| + | |DOMAIN= | ||
| + | |RELATEDENTRY= | ||
| + | |RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1leh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1leh OCA], [http://www.ebi.ac.uk/pdbsum/1leh PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1leh RCSB]</span> | ||
}} | }} | ||
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[[Category: oxidoreductase]] | [[Category: oxidoreductase]] | ||
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 22:01:53 2008'' |
Revision as of 19:01, 30 March 2008
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| , resolution 2.2Å | |||||||
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| Activity: | Leucine dehydrogenase, with EC number 1.4.1.9 | ||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
LEUCINE DEHYDROGENASE FROM BACILLUS SPHAERICUS
Overview
BACKGROUND: Glutamate, phenylalanine and leucine dehydrogenases catalyze the NAD(P)(+)-linked oxidative deamination of L-amino acids to the corresponding 2-oxoacids, and sequence homology between these enzymes clearly indicates the existence of an enzyme superfamily related by divergent evolution. We have undertaken structural studies on a number of members of this family in order to investigate the molecular basis of their differential amino acid specificity. RESULTS: We have solved the X-ray structure of the leucine dehydrogenase from Bacillus sphaericus to a resolution of 2.2 A. Each subunit of this octameric enzyme contains 364 amino acids and folds into two domains, separated by a deep cleft. The nicotinamide ring of the NAD+ cofactor binds deep in this cleft, which is thought to close during the hydride transfer step of the catalytic cycle. CONCLUSIONS: Comparison of the structure of leucine dehydrogenase with a hexameric glutamate dehydrogenase has shown that these two enzymes share a related fold and possess a similar catalytic chemistry. A mechanism for the basis of the differential amino acid specificity between these enzymes involves point mutations in the amino acid side-chain specificity pocket and subtle changes in the shape of this pocket caused by the differences in quaternary structure.
About this Structure
1LEH is a Single protein structure of sequence from Lysinibacillus sphaericus. Full crystallographic information is available from OCA.
Reference
A role for quaternary structure in the substrate specificity of leucine dehydrogenase., Baker PJ, Turnbull AP, Sedelnikova SE, Stillman TJ, Rice DW, Structure. 1995 Jul 15;3(7):693-705. PMID:8591046
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