NDLI: Redox properties of the photosystem II cytochromes b559 and c550 in the cyanobacterium Thermosynechococcus elongatus

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JBIC Journal of Biological Inorganic Chemistry : Volume 8, Issue 1-2, January 2003

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Redox properties of the photosystem II cytochromes b559 and c550 in the cyanobacterium Thermosynechococcus elongatus

Content Provider	Springer Nature Link
Author	Roncel, Mercedes Boussac, Alain Zurita, Jorge L. Bottin, Hervé Sugiura, Miwa Kirilovsky, Diana Ortega, José M.
Copyright Year	2002
Abstract	Redox properties of cytochrome b559 (Cyt b559) and cytochrome c550 (Cyt c550) have been studied by using highly stable photosystem II (PSII) core complex preparations from a mutant strain of the thermophilic cyanobacterium Thermosynechococcus elongatus with a histidine tag on the CP43 protein of PSII. Two different redox potential forms for Cyt b559 are found in these preparations, with a midpoint redox potential (E′m) of +390 mV in about half of the centers and +275 mV in the other half. The high-potential form, whose E′m is pH independent, can be converted into the lower potential form by Tris washing, mild heating or alkaline pH incubation. The E′m of the low-potential form is significantly higher than that found in other photosynthetic organisms and is not affected by pH. The possibility that the heme of Cyt b559 in T. elongatus is in a more hydrophobic environment is discussed. Cyt c550 has a higher E′m when bound to the PSII core (–80 mV at pH 6.0) than after its extraction from the complex (–240 mV at pH 6.0). The E′m of Cyt c550 bound to PSII is pH independent, while in the purified state an increase of about 58 mV/pH unit is observed when the pH decreases below pH 9.0. Thus, Cyt c550 seems to have a single protonateable group which influences the redox properties of the heme. From these electrochemical measurements and from EPR controls it is proposed that important changes in the solvent accessibility to the heme and in the acid-base properties of that protonateable group could occur upon the release of Cyt c550 from PSII.
Starting Page	206
Ending Page	216
Page Count	11
File Format	PDF
ISSN	09498257
Journal	JBIC Journal of Biological Inorganic Chemistry
Volume Number	8
Issue Number	1-2
e-ISSN	14321327
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-09-28
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Biochemistry Inorganic Chemistry

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