Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans.

Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans. Research Abstract Details 

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Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans. Abstract Text:

K Matsuura,M Hori,T Satoh,

When cells of the denitrifying phototrophic bacterium Rhodobacter sphaeroides forma sp. denitrificans were grown anaerobically under illumination in the presence of nitrate, the content of photosynthetic reaction centers per cellular protein was less than that in cells grown photosynthetically without nitrate under the same light intensity. The contents of cytochromes c1 and c2, which work in both photosynthetic and denitrifying electron transport systems, were almost constant, being independent of the presence of nitrate during growth. Consequently, the ratio of cytochromes c1 and c2 to the reaction center was more than three in the photo-denitrifying cells, whereas it was close to one in the photosynthetic cells under light-limiting conditions. In spite of the excess of cytochromes c1 + c2 over the reaction center in the photo-denitrifying cells, all cytochromes c1 + c2 were oxidized by illumination within hundreds of milliseconds in the presence of antimycin. When glycerol was added to increase the viscosity in the periplasm, biphasic oxidation of cytochromes c1 + c2 was apparent in the photo-denitrifying cells with repetitive flashes. The fast phase oxidation, which took place instantaneously (less than 1 ms) after the first and second flashes, showed a similar pattern to the oxidation in the light-limiting photosynthetic cells. The rate of the slow phase oxidation was sensitive to viscosity and was thought to reflect a diffusion-controlled second-order reaction between cytochrome c2 and the reaction center. The biphasic oxidation of cytochromes c1 + c2 suggests that these cytochromes exist in the photo-denitrifying cells as two different pools in relation to the reaction center.

Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans. Publishing Authors By Initials

K Matsuura,M Hori,T Satoh,

For similar bacteria: gram-negative bacteria: rhodobacter: rhodobacter sphaeroides research abstracts see: bacteria: gram-negative bacteria: rhodobacter: rhodobacter sphaeroides research

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Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of biochemistry

VOLUME: 104

Page Numbers: 1016-20

Journal Abbreviation: J. Biochem.

ISSN: 0021-924X

DAY: 19

MONTH: Dec

YEAR: 1988

Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans. Information

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LANGUAGE: eng

NlmUniqueID: 376600

Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans. Keywords Mesh Terms:

KEYWORDS: Rhodobacter sphaeroides

MESH TERMS: radiation effects

Chemical & Substance for Abstract: Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans. Information

Substance Name: Cytochromes c2

Registry Number: 9035-43-2

Grant and Affiliation Information for Heterogeneous pools of cytochrome c2 in photo-denitrifying cells of Rhodobacter sphaeroides forma sp. denitrificans.

AFFILIATION: Department of Biology, Faculty of Science, Tokyo Metropolitan University.

Country: JAPAN

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MEDLINETA: J Biochem

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