2grt
From Proteopedia
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| - | [[Image:2grt.jpg|left|200px]]<br /><applet load="2grt" size=" | + | [[Image:2grt.jpg|left|200px]]<br /><applet load="2grt" size="350" color="white" frame="true" align="right" spinBox="true" |
caption="2grt, resolution 2.70Å" /> | caption="2grt, resolution 2.70Å" /> | ||
'''HUMAN GLUTATHIONE REDUCTASE A34E, R37W MUTANT, OXIDIZED GLUTATHIONE COMPLEX'''<br /> | '''HUMAN GLUTATHIONE REDUCTASE A34E, R37W MUTANT, OXIDIZED GLUTATHIONE COMPLEX'''<br /> | ||
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==About this Structure== | ==About this Structure== | ||
| - | 2GRT 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 FAD and GDS as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Transferred_entry:_1.8.1.7 Transferred entry: 1.8.1.7], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.6.4.2 1.6.4.2] Known structural/functional Site: <scene name='pdbsite=S1:The Active Site HIS (HIS 467) Is From The Other Subunit'>S1</scene>. Full crystallographic information is available from [http:// | + | 2GRT 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=FAD:'>FAD</scene> and <scene name='pdbligand=GDS:'>GDS</scene> as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Transferred_entry:_1.8.1.7 Transferred entry: 1.8.1.7], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.6.4.2 1.6.4.2] Known structural/functional Site: <scene name='pdbsite=S1:The+Active+Site+HIS+(HIS+467)+Is+From+The+Other+Subunit'>S1</scene>. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2GRT OCA]. |
==Reference== | ==Reference== | ||
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[[Category: oxidoreductase]] | [[Category: oxidoreductase]] | ||
| - | ''Page seeded by [http:// | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Feb 3 10:37:56 2008'' |
Revision as of 08:37, 3 February 2008
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HUMAN GLUTATHIONE REDUCTASE A34E, R37W MUTANT, OXIDIZED GLUTATHIONE COMPLEX
Contents |
Overview
Trypanosoma and Leishmania, pathogens responsible for diseases such as, African sleeping sickness, Chagas' heart disease, or Oriental sore, are, two of the very few genera that do not use the ubiquitous, glutathione/glutathione reductase system to keep a stable cellular redox, balance. Instead, they rely on trypanothione and trypanothione reductase, to protect them from oxidative stress. Trypanothione reductase (TR) and, the corresponding host enzyme, human red blood cell glutathione reductase, (GR), belong to the same flavoprotein family. Despite their closely, related three-dimensional structures and although their natural substrates, share the common structural glutathione core, the two enzymes are mutually, exclusive with respect to their disulfide substrates. This makes the, parasite enzyme a potential target for antitrypanosomal drug design. While, a large body of structural data on GR complexes is available, information, on TR-ligand interactions is very limited. When the two amino acid changes, Ala34Glu and Arg37Trp are introduced into human GR, the resulting mutant, enzyme (GRTR) prefers trypanothione 700-fold over its original substrate, effectively converting a GR into a TR [Bradley, M., Bucheler, U. S., &, Walsh, C. T. (1991) Biochemistry 30, 6124-6127]. The crystal structure of, GRTR has been determined at 2.3 A resolution and refined to a, crystallographic R factor of 20.9%. We have taken advantage of the ease, with which ligand complexes can be produced in GR crystals, a property, that extends to the isomorphous GRTR crystals, and have produced and, analyzed crystals of GRTR complexes with glutathione, trypanothione, glutathionylspermidine and of a true catalytic intermediate, the mixed, disulfide between trypanothione and the enzyme. The corresponding, molecular structures have been characterized at resolutions between 2.3, and 2.8 A with R factors ranging from 17.1 to 19.7%. The results indicate, that the Ala34Glu mutation causes steric hindrance leading to a large, displacement of the side chain of Arg347. This movement combined with the, change in charge introduced by the mutations modifies the binding cavity, forcing glutathione to adopt a nonproductive binding mode and permitting, trypanothione and to a certain degree also the weak substrate, glutathionylspermidine to assume a productive mode.
Disease
Known diseases associated with this structure: Hemolytic anemia due to glutathione reductase deficiency OMIM:[138300], Mental retardation, autosomal recessive, 6 OMIM:[138244]
About this Structure
2GRT is a Single protein structure of sequence from Homo sapiens with and as ligands. Active as Transferred entry: 1.8.1.7, with EC number 1.6.4.2 Known structural/functional Site: . Full crystallographic information is available from OCA.
Reference
Glutathione reductase turned into trypanothione reductase: structural analysis of an engineered change in substrate specificity., Stoll VS, Simpson SJ, Krauth-Siegel RL, Walsh CT, Pai EF, Biochemistry. 1997 May 27;36(21):6437-47. PMID:9174360
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