From Proteopedia
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| - | [[Image:2fzw.gif|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_2fzw| PDB=2fzw | SCENE= }} | | {{STRUCTURE_2fzw| PDB=2fzw | SCENE= }} |
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| - | '''Structure of the binary complex of the E67L mutant of human glutathione-dependent formaldehyde dehydrogenase with NAD(H)'''
| + | ===Structure of the binary complex of the E67L mutant of human glutathione-dependent formaldehyde dehydrogenase with NAD(H)=== |
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| - | ==Overview==
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| - | The active-site zinc in human glutathione-dependent formaldehyde dehydrogenase (FDH) undergoes coenzyme-induced displacement and transient coordination to a highly conserved glutamate residue (Glu-67) during the catalytic cycle. The role of this transient coordination of the active-site zinc to Glu-67 in the FDH catalytic cycle and the associated coenzyme interactions were investigated by studying enzymes in which Glu-67 and Arg-368 were substituted with Leu. Structures of FDH.adenosine 5'-diphosphate ribose (ADP-ribose) and E67L.NAD(H) binary complexes were determined. Steady-state kinetics, isotope effects, and presteady-state analysis of the E67L enzyme show that Glu-67 is critical for capturing the substrates for catalysis. The catalytic efficiency (V/K(m)) of the E67L enzyme in reactions involving S-nitrosoglutathione (GSNO), S-hydroxymethylglutathione (HMGSH) and 12-hydroxydodecanoic acid (12-HDDA) were 25 000-, 3000-, and 180-fold lower, respectively, than for the wild-type enzyme. The large decrease in the efficiency of capturing GSNO and HMGSH by the E67L enzyme results mainly because of the impaired binding of these substrates to the mutant enzyme. In the case of 12-HDDA, a decrease in the rate of hydride transfer is the major factor responsible for the reduction in the efficiency of its capture for catalysis by the E67L enzyme. Binding of the coenzyme is not affected by the Glu-67 substitution. A partial displacement of the active-site zinc in the FDH.ADP-ribose binary complex indicates that the disruption of the interaction between Glu-67 and Arg-368 is involved in the displacement of active-site zinc. Kinetic studies with the R368L enzyme show that the predominant role of Arg-368 is in the binding of the coenzyme. An isomerization of the ternary complex before hydride transfer is detected in the kinetic pathway of HMGSH. Steps involved in the binding of the coenzyme to the FDH active site are also discerned from the unique conformation of the coenzyme in one of the subunits of the E67L.NAD(H) binary complex.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_16605250}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 16605250 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_16605250}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Glutathione-dependent formaldehyde dehydrogenase]] | | [[Category: Glutathione-dependent formaldehyde dehydrogenase]] |
| | [[Category: S-nitrosoglutathione reductase]] | | [[Category: S-nitrosoglutathione reductase]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:31:27 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 01:07:39 2008'' |
Revision as of 22:07, 28 July 2008
Template:STRUCTURE 2fzw
Structure of the binary complex of the E67L mutant of human glutathione-dependent formaldehyde dehydrogenase with NAD(H)
Template:ABSTRACT PUBMED 16605250
About this Structure
2FZW is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structure-function relationships in human glutathione-dependent formaldehyde dehydrogenase. Role of Glu-67 and Arg-368 in the catalytic mechanism., Sanghani PC, Davis WI, Zhai L, Robinson H, Biochemistry. 2006 Apr 18;45(15):4819-30. PMID:16605250
Page seeded by OCA on Tue Jul 29 01:07:39 2008
