✦ LIBER ✦

Quadrupole parameters of nitrogen nuclei in the cation radical P700.+ determined by ESEEM of single crystals of phtosystem I

✍ Scribed by H. Käβ; P. Fromme; W. Lubitz

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 888 KB
Volume: 257
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(96)00533-7

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✦ Synopsis

The cation radical of the primary donor P7oo of photosystem I (PS I) is investigated by ESEEM on single crystals of PSI from the cyanobacterium Synechococcus elongatus. The nuclear quadrupole parameters K and ~ of five different 14N nuclei are determined and 14N hyperfine couplings (hfc's) of PT"o~ are evaluated. For comparison the cation of methyl-chlorophyllide a is studied in frozen solution. The ~4N hfc data agree with published results for the lSN-labeled cation radicals of PT0O and chlorophyll a and are discussed in terms of a chlorophyll a dimer model for the cation radical PT"0~.