A unique photosynthetic reaction center from Heliobacterium chlorum

FEBS Letters

Blankenship, Robert E.³  Sprague, Sallie G.⁴  Fuller, R.Clinton¹  Gest, Howard² 

[1]Department of Biochemistry, University of Massachusetts, Amherst, MA 01003, USA

[2]Photosynthetic Bacteria Group, Department of Biology, Indiana University, Bloomington, IN 47405 USA

[3]Department of Chemistry, Amherst College, Amherst, MA 01002 USA

[4]Department of Molecular, Cellular and Developmental Biology, University of Colorado, Boulder, CO 80309, USA

关键词: Heliobacterium chlorum;    Photosynthesis;    Bacteriochlorophyll;    Reaction center;    Cytochrome;    Evolution;    BChl;    bacteriochlorophyll;    LDS-PAGE;    lithium dodecyl sulfate polyacrylamide gel electrophoresis;   

DOI  :  10.1016/0014-5793(85)80330-6

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

A previously unknown type of photosynthetic reaction center in the brownish-green bacterium Heliobacterium chlorum is described. The reaction center is tightly bound in a highly proteinaceous undifferentiated plasma membrane and contains bacteriochlorophyll g, which has major in vivo absorbancies at 788, 576 and 370 nm. The purified membrane shows a reversible photobleaching at 798 nm; the reaction center bacteriochlorophyll g is designated P798. A reversible photobleaching at 553 nm is assigned to photooxidation of a membrane-bound c-type cytochrome. The membrane structure, pigment composition and photochemical properties suggest that H. chlorum may represent a fifth family of anoxygenic photosynthetic procaryotes.

【 授权许可】

Unknown