Abstract:
:We have determined the first de novo position of the secondary quinone QB in the Rhodobacter sphaeroides reaction center (RC) using phases derived by the single wavelength anomalous dispersion method from crystals with selenomethionine substitution. We found that in frozen RC crystals, QB occupies primarily the proximal binding site. In contrast, our room temperature structure showed that QB is largely in the distal position. Both data sets were collected in dark-adapted conditions. We estimate that the occupancy of the QB site is 80% with a proximal: distal ratio of 4:1 in frozen RC crystals. We could not separate the effect of freezing from the effect of the cryoprotectants ethylene glycol or glycerol. These results could have far-reaching implications in structure/function studies of electron transfer in the acceptor quinone complex because the above are the most commonly used cryoprotectants in spectroscopic experiments.
journal_name
FEBS Lettjournal_title
FEBS lettersauthors
Pokkuluri PR,Laible PD,Crawford AE,Mayfield JF,Yousef MA,Ginell SL,Hanson DK,Schiffer Mdoi
10.1016/j.febslet.2004.06.042keywords:
subject
Has Abstractpub_date
2004-07-16 00:00:00pages
171-4issue
1-3eissn
0014-5793issn
1873-3468pii
S0014579304007835journal_volume
570pub_type
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