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| - | [[Image:2fzm.jpg|left|200px]] | + | {{Seed}} |
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| | {{STRUCTURE_2fzm| PDB=2fzm | SCENE= }} | | {{STRUCTURE_2fzm| PDB=2fzm | SCENE= }} |
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| - | '''Structure of the E. coli PutA proline dehydrogenase domain reduced by dithionite and complexed with SO2'''
| + | ===Structure of the E. coli PutA proline dehydrogenase domain reduced by dithionite and complexed with SO2=== |
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| - | ==Overview==
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| - | PutA is a novel flavoprotein in Escherichia coli that switches from a transcriptional repressor to a membrane-bound proline catabolic enzyme. Previous crystallographic studies of the PutA proline dehydrogenase (PRODH) domain under oxidizing conditions revealed that FAD N(5) and the ribityl 2'-OH group form hydrogen bonds with Arg431 and Arg556, respectively. Here we identify molecular interactions in the PutA PRODH active site that underlie redox-dependent functional switching of PutA. We report that reduction of the PRODH domain induces major structural changes in the FAD cofactor, including a 22 degrees bend of the isoalloxazine ring along the N(5)-N(10) axis, crankshaft rotation of the upper part of the ribityl chain, and formation of a new hydrogen bond network involving the ribityl 2'-OH group, FAD N(1), and Gly435. The roles of the FAD 2'-OH group and the FAD N(5)-Arg431 hydrogen bond pair in regulating redox-dependent PutA-membrane associations were tested using FAD analogues and site-directed mutagenesis. Kinetic membrane binding measurements and cell-based reporter gene assays of modified PutA proteins show that disrupting the FAD N(5)-Arg431 interaction impairs the reductive activation of PutA-membrane binding. We also show that the FAD 2'-OH group acts as a redox-sensitive toggle switch that controls PutA-membrane binding. These results illustrate a new versatility of the ribityl chain in flavoprotein mechanisms.
| + | The line below this paragraph, {{ABSTRACT_PUBMED_17209558}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 17209558 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_17209558}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: Proline utilization some]] | | [[Category: Proline utilization some]] |
| | [[Category: Puta]] | | [[Category: Puta]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:30:49 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 08:23:12 2008'' |
Revision as of 05:23, 28 July 2008
Template:STRUCTURE 2fzm
Structure of the E. coli PutA proline dehydrogenase domain reduced by dithionite and complexed with SO2
Template:ABSTRACT PUBMED 17209558
About this Structure
2FZM is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.
Reference
Redox-induced changes in flavin structure and roles of flavin N(5) and the ribityl 2'-OH group in regulating PutA--membrane binding., Zhang W, Zhang M, Zhu W, Zhou Y, Wanduragala S, Rewinkel D, Tanner JJ, Becker DF, Biochemistry. 2007 Jan 16;46(2):483-91. PMID:17209558
Page seeded by OCA on Mon Jul 28 08:23:12 2008
