Journal Article

Pigment Composition of a Novel Oxygenic Photosynthetic Prokaryote Containing Chlorophyll <i>d</i> as the Major Chlorophyll

Hideaki Miyashita, Kyoko Adachi, Norihide Kurano, Hisato Ikemot, Mitsuo Chihara and Shigetoh Miyach

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 38, issue 3, pages 274-281
Published in print January 1997 | ISSN: 0032-0781
Published online January 1997 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/oxfordjournals.pcp.a029163
Pigment Composition of a Novel Oxygenic Photosynthetic Prokaryote Containing Chlorophyll d as the Major Chlorophyll

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The principal pigment found in the majority of oxygenic photosynthetic organisms is known to be chlorophyll a. However, we isolated a new oxygenic photosynthetic prokaryote that contained chlorophyll d as a predominant pigment with chlorophyll a being a minor pigment. Chlorophyll d had previously been noted but its natural occurrence and function remained unclear. Cells of the new prokaryote had an absorption maximum at red region of 714–718 nm due to chlorophyll d absorption, but no characteristic absorption peak of chlorophyll a around 680 nm was observed. Chlorophyll d of the new organism was identified spectrophotometrically in several solvents and its chemical structure was confirmed by NMR and FABMS analysis. The cell also contained a chlorophyll c-like pigment, zeaxanthin and a-carotene but not chlorophyll b and β-carotene. The content of chlorophyll d accounted for more than 2% of the cell dry weight, while the content of chlorophyll a was less than 0.1%. The chlorophyll a/d ratio remained between 0.03 and 0.09 under different culture conditions. The light absorption characteristics and the high content of chlorophyll d along with the small content of chlorophyll a indicated the existence of a new light utilization mechanism involving chlorophyll d.

Keywords: Chlorophyll d; In vivo absorption; NMR; Oxygenic photosynthesis; Pigment composition; Prokaryote

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Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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