2uxk: Difference between revisions

Revision as of 17:45, 4 May 2008

X-RAY HIGH RESOLUTION STRUCTURE OF THE PHOTOSYNTHETIC REACTION CENTER FROM RB. SPHAEROIDES AT PH 10 IN THE CHARGE-SEPARATED STATE

OverviewOverview

The structure of the photosynthetic reaction-center from Rhodobacter sphaeroides has been determined at four different pH values (6.5, 8.0, 9.0, 10.0) in the neutral and in charge separated states. At pH 8.0, in the neutral state, we obtain a resolution of 1.87 A, which is the best ever reported for the bacterial reaction center protein. Our crystallographic data confirm the existence of two different binding positions of the secondary quinone (QB). We observe a new orientation of QB in its distal position, which shows no ring-flip compared to the orientation in the proximal position. Datasets collected for the different pH values show a pH-dependence of the population of the proximal position. The new orientation of QB in the distal position and the pH-dependence could be confirmed by continuum electrostatics calculations. Our calculations are in agreement with the experimentally observed proton uptake upon charge separation. The high resolution of our crystallographic data allows us to identify new water molecules and external residues being involved in two previously described hydrogen bond proton channels. These extended proton-transfer pathways, ending at either of the two oxo-groups of QB in its proximal position, provide additional evidence that ring-flipping is not required for complete protonation of QB upon reduction.

About this StructureAbout this Structure

2UXK is a Protein complex structure of sequences from Rhodobacter sphaeroides. Full crystallographic information is available from OCA.

ReferenceReference

pH modulates the quinone position in the photosynthetic reaction center from Rhodobacter sphaeroides in the neutral and charge separated states., Koepke J, Krammer EM, Klingen AR, Sebban P, Ullmann GM, Fritzsch G, J Mol Biol. 2007 Aug 10;371(2):396-409. Epub 2007 May 10. PMID:17570397 Page seeded by OCA on Sun May 4 17:45:19 2008

Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA

@@ Line 1: / Line 1: @@
 [[Image:2uxk.jpg|left|200px]]
- {{Structure
+<!--
-|PDB= 2uxk |SIZE=350|CAPTION= <scene name='initialview01'>2uxk</scene>, resolution 2.31&Aring;
+The line below this paragraph, containing "STRUCTURE_2uxk", creates the "Structure Box" on the page.
-|SITE= <scene name='pdbsite=AC1:Gol+Binding+Site+For+Chain+H'>AC1</scene>
+You may change the PDB parameter (which sets the PDB file loaded into the applet)
-|LIGAND= <scene name='pdbligand=BCL:BACTERIOCHLOROPHYLL+A'>BCL</scene>, <scene name='pdbligand=BPH:BACTERIOPHEOPHYTIN+A'>BPH</scene>, <scene name='pdbligand=CDN:CARDIOLIPIN'>CDN</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=HTO:HEPTANE-1,2,3-TRIOL'>HTO</scene>, <scene name='pdbligand=LDA:LAURYL+DIMETHYLAMINE-N-OXIDE'>LDA</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=SPO:SPHEROIDENE'>SPO</scene>, <scene name='pdbligand=U10:UBIQUINONE-10'>U10</scene>, <scene name='pdbligand=UQ2:UBIQUINONE-2'>UQ2</scene>
+or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-|ACTIVITY=
+or leave the SCENE parameter empty for the default display.
-|GENE=
+-->
-|DOMAIN=
+{{STRUCTURE_2uxk|  PDB=2uxk  |  SCENE=  }}
-|RELATEDENTRY=[[1aig|1AIG]], [[1aij|1AIJ]], [[1ds8|1DS8]], [[1dv3|1DV3]], [[1dv6|1DV6]], [[1e14|1E14]], [[1e6d|1E6D]], [[1f6n|1F6N]], [[1fnp|1FNP]], [[1fnq|1FNQ]], [[1jgw|1JGW]], [[1jgx|1JGX]], [[1jgy|1JGY]], [[1jgz|1JGZ]], [[1jh0|1JH0]], [[1k6l|1K6L]], [[1k6n|1K6N]], [[1kby|1KBY]], [[1l9b|1L9B]], [[1l9j|1L9J]], [[1m3x|1M3X]], [[1mps|1MPS]], [[1ogv|1OGV]], [[1pcr|1PCR]], [[1pss|1PSS]], [[1pst|1PST]], [[1qov|1QOV]], [[1rg5|1RG5]], [[1rgn|1RGN]], [[1rqk|1RQK]], [[1rvj|1RVJ]], [[1ry5|1RY5]], [[1rzh|1RZH]], [[1rzz|1RZZ]], [[1s00|1S00]], [[1umx|1UMX]], [[1yst|1YST]], [[1z9j|1Z9J]], [[1z9k|1Z9K]], [[2bnp|2BNP]], [[2bns|2BNS]], [[2boz|2BOZ]], [[2gmr|2GMR]], [[2j8c|2J8C]], [[2j8d|2J8D]], [[2rcr|2RCR]], [[2uws|2UWS]], [[2uwt|2UWT]], [[2uwu|2UWU]], [[2uwv|2UWV]], [[2uww|2UWW]], [[2ux3|2UX3]], [[2ux4|2UX4]], [[2ux5|2UX5]], [[4rcr|4RCR]], [[2uxj|2UXJ]], [[2uxl|2UXL]], [[2uxm|2UXM]]
-|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2uxk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2uxk OCA], [http://www.ebi.ac.uk/pdbsum/2uxk PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=2uxk RCSB]</span>
-}}
 '''X-RAY HIGH RESOLUTION STRUCTURE OF THE PHOTOSYNTHETIC REACTION CENTER FROM RB. SPHAEROIDES AT PH 10 IN THE CHARGE-SEPARATED STATE'''
@@ Line 28: / Line 25: @@
 [[Category: Fritzsch, G.]]
 [[Category: Koepke, J.]]
-[[Category: bacteriochlorophyll]]
+[[Category: Bacteriochlorophyll]]
-[[Category: binding positions of the secondary quinone qb]]
+[[Category: Binding positions of the secondary quinone qb]]
-[[Category: cardiolipin]]
+[[Category: Cardiolipin]]
-[[Category: chlorophyll]]
+[[Category: Chlorophyll]]
-[[Category: chromophore]]
+[[Category: Chromophore]]
-[[Category: electron transport]]
+[[Category: Electron transport]]
-[[Category: iron]]
+[[Category: Iron]]
-[[Category: magnesium]]
+[[Category: Magnesium]]
-[[Category: membrane]]
+[[Category: Membrane]]
-[[Category: metal-binding]]
+[[Category: Metal-binding]]
-[[Category: photosynthesis]]
+[[Category: Photosynthesis]]
-[[Category: proton translocation pathway]]
+[[Category: Proton translocation pathway]]
-[[Category: reaction center]]
+[[Category: Reaction center]]
-[[Category: transmembrane]]
+[[Category: Transmembrane]]
-[[Category: transport]]
+[[Category: Transport]]
+''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May  4 17:45:19 2008''
-''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Mar 31 05:05:57 2008''