2bmv
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:2bmv.gif|left|200px]] | [[Image:2bmv.gif|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_2bmv", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | + | or leave the SCENE parameter empty for the default display. | |
| - | + | --> | |
| - | | | + | {{STRUCTURE_2bmv| PDB=2bmv | SCENE= }} |
| - | | | + | |
| - | + | ||
| - | }} | + | |
'''APOFLAVODOXIN FROM HELICOBACTER PYLORI''' | '''APOFLAVODOXIN FROM HELICOBACTER PYLORI''' | ||
| Line 31: | Line 28: | ||
[[Category: Perez-Dorado, I.]] | [[Category: Perez-Dorado, I.]] | ||
[[Category: Sancho, J.]] | [[Category: Sancho, J.]] | ||
| - | [[Category: | + | [[Category: Electron transport]] |
| - | [[Category: | + | [[Category: Flavoprotein]] |
| - | [[Category: | + | [[Category: Fmn]] |
| - | [[Category: | + | [[Category: Helicobacter pylori]] |
| - | [[Category: | + | [[Category: Transport protein]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 20:30:44 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 17:30, 3 May 2008
APOFLAVODOXIN FROM HELICOBACTER PYLORI
Overview
Flavodoxins, noncovalent complexes between apoflavodoxins and flavin mononucleotide (FMN), are useful models to investigate the mechanism of protein/flavin recognition. In this respect, the only available crystal structure of an apoflavodoxin (that from Anabaena) showed a closed isoalloxazine pocket and the presence of a bound phosphate ion, which posed many questions on the recognition mechanism and on the potential physiological role exerted by phosphate ions. To address these issues we report here the X-ray structure of the apoflavodoxin from the pathogen Helicobacter pylori. The protein naturally lacks one of the conserved aromatic residues that close the isoalloxazine pocket in Anabaena, and the structure has been determined in a medium lacking phosphate. In spite of these significant differences, the isoallozaxine pocket in H. pylori apoflavodoxin appears also closed and a chloride ion is bound at a native-like FMN phosphate site. It seems thus that it is a general characteristic of apoflavodoxins to display closed, non-native, isoalloxazine binding sites together with native-like, rather promiscuous, phosphate binding sites that can bear other available small anions present in solution. In this respect, both binding energy hot spots of the apoflavodoxin/FMN complex are initially unavailable to FMN binding and the specific spot for FMN recognition may depend on the dynamics of the two candidate regions. Molecular dynamics simulations show that the isoalloxazine binding loops are intrinsically flexible at physiological temperatures, thus facilitating the intercalation of the cofactor, and that their mobility is modulated by the anion bound at the phosphate site.
About this Structure
2BMV is a Single protein structure of sequence from Helicobacter pylori. Full crystallographic information is available from OCA.
Reference
Common conformational changes in flavodoxins induced by FMN and anion binding: the structure of Helicobacter pylori apoflavodoxin., Martinez-Julvez M, Cremades N, Bueno M, Perez-Dorado I, Maya C, Cuesta-Lopez S, Prada D, Falo F, Hermoso JA, Sancho J, Proteins. 2007 Nov 15;69(3):581-94. PMID:17623845 Page seeded by OCA on Sat May 3 20:30:44 2008
