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| | ==(M)L214A mutant of the Rhodobacter sphaeroides Reaction Center== | | ==(M)L214A mutant of the Rhodobacter sphaeroides Reaction Center== |
| - | <StructureSection load='4in6' size='340' side='right' caption='[[4in6]], [[Resolution|resolution]] 2.70Å' scene=''> | + | <StructureSection load='4in6' size='340' side='right'caption='[[4in6]], [[Resolution|resolution]] 2.70Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4in6]] is a 3 chain structure with sequence from [http://en.wikipedia.org/wiki/"rhodococcus_capsulatus"_molisch_1907 "rhodococcus capsulatus" molisch 1907]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IN6 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4IN6 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4in6]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Cereibacter_sphaeroides Cereibacter sphaeroides]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4IN6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4IN6 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=BCL:BACTERIOCHLOROPHYLL+A'>BCL</scene>, <scene name='pdbligand=BPH:BACTERIOPHEOPHYTIN+A'>BPH</scene>, <scene name='pdbligand=CDL:CARDIOLIPIN'>CDL</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=GGD:NONADEC-10-ENOIC+ACID+2-[3,4-DIHYDROXY-6-HYDROXYMETHYL-5-(3,4,5-TRIHYDROXY-6-HYDROXYMETHYL-TETRAHYDRO-PYRAN-2-YLOXY)-TETRAHYDRO-PYRAN-2-YLOXY]-1-OCTADEC-9-ENOYLOXYMETHYL-ETHYL+ESTER'>GGD</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=PC1:1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE'>PC1</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=SPO:SPHEROIDENE'>SPO</scene>, <scene name='pdbligand=U10:UBIQUINONE-10'>U10</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=BCL:BACTERIOCHLOROPHYLL+A'>BCL</scene>, <scene name='pdbligand=BPH:BACTERIOPHEOPHYTIN+A'>BPH</scene>, <scene name='pdbligand=CDL:CARDIOLIPIN'>CDL</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=GGD:NONADEC-10-ENOIC+ACID+2-[3,4-DIHYDROXY-6-HYDROXYMETHYL-5-(3,4,5-TRIHYDROXY-6-HYDROXYMETHYL-TETRAHYDRO-PYRAN-2-YLOXY)-TETRAHYDRO-PYRAN-2-YLOXY]-1-OCTADEC-9-ENOYLOXYMETHYL-ETHYL+ESTER'>GGD</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=PC1:1,2-DIACYL-SN-GLYCERO-3-PHOSPHOCHOLINE'>PC1</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene>, <scene name='pdbligand=SPO:SPHEROIDENE'>SPO</scene>, <scene name='pdbligand=U10:UBIQUINONE-10'>U10</scene></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4in5|4in5]], [[4in7|4in7]]</td></tr>
| + | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4in6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4in6 OCA], [https://pdbe.org/4in6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4in6 RCSB], [https://www.ebi.ac.uk/pdbsum/4in6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4in6 ProSAT]</span></td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">pufL, puhA ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1063 "Rhodococcus capsulatus" Molisch 1907]), pufM ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1063 "Rhodococcus capsulatus" Molisch 1907])</td></tr>
| + | |
| - | <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4in6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4in6 OCA], [http://pdbe.org/4in6 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4in6 RCSB], [http://www.ebi.ac.uk/pdbsum/4in6 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4in6 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/RCEL_RHOSH RCEL_RHOSH]] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. [[http://www.uniprot.org/uniprot/RCEH_RHOSH RCEH_RHOSH]] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. [[http://www.uniprot.org/uniprot/RCEM_RHOSH RCEM_RHOSH]] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. | + | [https://www.uniprot.org/uniprot/RCEL_CERS4 RCEL_CERS4] The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Rhodococcus capsulatus molisch 1907]] | + | [[Category: Cereibacter sphaeroides]] |
| - | [[Category: Beatty, J T]] | + | [[Category: Large Structures]] |
| - | [[Category: Hardjasa, A]] | + | [[Category: Beatty JT]] |
| - | [[Category: Murphy, M E.P]] | + | [[Category: Hardjasa A]] |
| - | [[Category: Saer, R G]] | + | [[Category: Murphy MEP]] |
| - | [[Category: Chromatophore]] | + | [[Category: Saer RG]] |
| - | [[Category: Electron transfer]]
| + | |
| - | [[Category: Oxidoreductase]]
| + | |
| Structural highlights
4in6 is a 3 chain structure with sequence from Cereibacter sphaeroides. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
| | Ligands: | , , , , , , , , , , , |
| Resources: | FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT |
Function
RCEL_CERS4 The reaction center is a membrane-bound complex that mediates the initial photochemical event in the electron transfer process of photosynthesis.
Publication Abstract from PubMed
In the native reaction center (RC) of Rhodobacter sphaeroides, the side chain of (M)L214 projects orthogonally toward the plane and into the center of the A branch bacteriopheophytin (BPhe) macrocycle. The possibility that this side chain is responsible for the dechelation of the central Mg(2+) of bacteriochlorophyll (BChl) was investigated by replacement of (M)214 with residues possessing small, nonpolar side chains that can neither coordinate nor block access to the central metal ion. The (M)L214 side chain was also replaced with Cys, Gln, and Asn to evaluate further the requirements for assembly of the RC with BChl in the HA pocket. Photoheterotrophic growth studies showed no difference in growth rates of the (M)214 nonpolar mutants at a low light intensity, but the growth of the amide-containing mutants was impaired. The absorbance spectra of purified RCs indicated that although absorbance changes are associated with the nonpolar mutations, the nonpolar mutant RC pigment compositions are the same as in the wild-type protein. Crystal structures of the (M)L214G, (M)L214A, and (M)L214N mutants were determined (determined to 2.2-2.85 A resolution), confirming the presence of BPhe in the HA pocket and revealing alternative conformations of the phytyl tail of the accessory BChl in the BA site of these nonpolar mutants. Our results demonstrate that (i) BChl is converted to BPhe in a manner independent of the aliphatic side chain length of nonpolar residues replacing (M)214, (ii) BChl replaces BPhe if residue (M)214 has an amide-bearing side chain, (iii) (M)214 side chains containing sulfur are not sufficient to bind BChl in the HA pocket, and (iv) the (M)214 side chain influences the conformation of the phytyl tail of the BA BChl.
Role of Rhodobacter sphaeroides Photosynthetic Reaction Center Residue M214 in the Composition, Absorbance Properties, and Conformations of HA and BA Cofactors.,Saer RG, Hardjasa A, Rosell FI, Mauk AG, Murphy ME, Beatty JT Biochemistry. 2013 Apr 2;52(13):2206-17. doi: 10.1021/bi400207m. Epub 2013 Mar, 25. PMID:23480277[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Saer RG, Hardjasa A, Rosell FI, Mauk AG, Murphy ME, Beatty JT. Role of Rhodobacter sphaeroides Photosynthetic Reaction Center Residue M214 in the Composition, Absorbance Properties, and Conformations of HA and BA Cofactors. Biochemistry. 2013 Apr 2;52(13):2206-17. doi: 10.1021/bi400207m. Epub 2013 Mar, 25. PMID:23480277 doi:10.1021/bi400207m
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