ISSN:
1573-5079
Keywords:
cytochrome
;
electron transfer
;
heme ligand
;
Rhodopseudomonas viridis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Isolated reaction centers of Rhodopseudomonas viridis with the two high-potential hemes reduced were illuminated at 5 K. Difference spectra show a bleaching of the heme c-556 alpha bands and a red shift of the Soret band. These effects are reversed by warming to around 80 K. They are not induced by near infra-red light absorbed by the chlorine pigments of the reaction centers and they are not associated with electron transfer from P to QA. It is concluded that, following direct excitation, heme c-556 becomes five-coordinated. We find no evidence of a significant photooxidation of heme c-559 under the same conditions.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1005912320470
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