Premium
A unique photosynthetic reaction center from Heliobacterium chlorum
Author(s) -
Fuller R.Clinton,
Sprague Sallie G.,
Gest Howard,
Blankenship Robert E.
Publication year - 1985
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(85)80330-6
Subject(s) - photosynthetic reaction centre , bacteriochlorophyll , anoxygenic photosynthesis , photobleaching , chemistry , photosynthesis , photochemistry , membrane , pigment , biophysics , biology , biochemistry , phototroph , fluorescence , organic chemistry , physics , quantum mechanics
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.