TAILIEUCHUNG - Báo cáo khoa học: J1–Photosynthetic Light Harvesting and Reaction Center Complexes

We measured cocrystals of the membrane protein Photosystem I with its soluble electron acceptor ferredoxin for the first time at the ALS (Berkeley, CA). Previous data collected at our home source and at other synchrotron sources showed crystals with very high mosaicity (2–5%) and a diffraction limit to 7–8 Aresolution. This first beamtime at ALS was very successful and may represent a breakthrough for the determination of the crystal structure. 110 crystals, grown under modified crystallization conditions, were scanned and for the first time, crystals diffraction to A were observed | Abstracts J1-Photosynthetic Light Harvesting and Reaction Center Complexes J1-001 Cocrystals of photosystem I with its soluble natural electron acceptor ferredoxin at 4 A resolution R. Fromme H. Yu I. Grotjohann and P. Fromme Department of Chemistry and Biochemistry Arizona State University Tempe AZ USA. E-mail We measured cocrystals of the membrane protein Photosystem I with its soluble electron acceptor ferredoxin for the first time at the ALS Berkeley CA . Previous data collected at our home source and at other synchrotron sources showed crystals with very high mosaicity 2-5 and a diffraction limit to 7-8 Aresolution. This first beamtime at ALS was very successful and may represent a breakthrough for the determination of the crystal structure. 110 crystals grown under modified crystallization conditions were scanned and for the first time crystals diffraction to A were observed. These crystals have a different space group and unit cell dimensions than all previous grown PSI-ferr cocrystals. The space group has been determined to be P21 with a b c alpha beta gamma . A full data set 360 images with min exposure image and rotation image was collected from one crystal even if the long X-ray exposure has limited the completeness of the higher resolution data being 99 complete at A and 63 complete at A. The mosaicity of the crystal was with much lower than the mosaicity of all previously measured crystals of the PSI-ferredoxin supercomplex. In addition to the native data set two low resolution datasets on the iron edge and peak for MAD were collected to 7 A resolution. These data sets were measured after the native data sets on the same crystal with decreasing diffraction quality due to X-ray damage. Therefore the data evaluation was limited to 8-9 A which is not sufficient for MAD phasing based on the FeS clusters in PS I and ferredoxin. Preliminary phasing with Molecular Replacement .

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