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| | {{STRUCTURE_1ds7| PDB=1ds7 | SCENE= }} | | {{STRUCTURE_1ds7| PDB=1ds7 | SCENE= }} |
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| - | '''A MINOR FMN-DEPENDENT NITROREDUCTASE FROM ESCHERICHIA COLI B'''
| + | ===A MINOR FMN-DEPENDENT NITROREDUCTASE FROM ESCHERICHIA COLI B=== |
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| - | ==Overview==
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| - | The FMN-dependent flavoprotein nitroreductase from Escherichia coli B (NTR) is used in cancer chemotherapy to activate a range of prodrugs. The crystal structure of this enzyme has been determined, using molecular replacement methods and refined at 2.06 A resolution. The recombinant 24-kDa enzyme was crystallized in the tetragonal space group P4(1)2(1)2, with unit cell dimensions of a = b = 57.74 A and c = 275.51 A and two molecules in the asymmetric unit. The structure has a final R factor of 20.3% (R(free) = 26.7%), for all data between the resolution ranges of 10-2.06 A, and includes 4453 protein atoms, 230 water molecules, and 2 flavin mononucleotide (FMN) molecules. The functional unit is a homodimer, which forms the asymmetric unit in the crystal structure. The tertiary structures of these two monomers and their subunit interactions are nearly identical. The molecular replacement search model, the crystal structure of the major NAD(P)H:FMN oxidoreductase of Vibrio fisheri (FRase 1), was selected on the basis of its high sequence identity to that of NTR. The final superposition of these two enzymes revealed a very similar overall fold, with variation in the structures focused around surface loops and helices near the FMN cofactor. Helix G is implicated in substrate specificity and is better resolved in the present NTR structure than in the previously reported FRase 1 structure. The FMN binding pocket is also well-resolved, showing the presence of two channels leading into the active site. The amino acid side chains and main chain atoms interacting with the FMN are well-ordered. The structure of the substrate binding pocket has been used to examine substrate specificity and enzyme kinetics for prodrugs used in antibody-directed enzyme prodrug therapy (ADEPT) and gene-directed enzyme prodrug therapy (GDEPT). | + | The line below this paragraph, {{ABSTRACT_PUBMED_11020276}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 11020276 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_11020276}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Fmn]] | | [[Category: Fmn]] |
| | [[Category: Nitroreductase]] | | [[Category: Nitroreductase]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 14:12:40 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 23:32:20 2008'' |
Revision as of 20:32, 30 June 2008
Template:STRUCTURE 1ds7
A MINOR FMN-DEPENDENT NITROREDUCTASE FROM ESCHERICHIA COLI B
Template:ABSTRACT PUBMED 11020276
About this Structure
1DS7 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Crystal structure of FMN-dependent nitroreductase from Escherichia coli B: a prodrug-activating enzyme., Parkinson GN, Skelly JV, Neidle S, J Med Chem. 2000 Oct 5;43(20):3624-31. PMID:11020276
Page seeded by OCA on Mon Jun 30 23:32:20 2008
