Photochemical activities and photosynthetic ATP formation in membrane preparation from a facultative methylotroph, Protaminobacter ruber strain NR-1

Abstract

Membrane preparation from the bacteriochlorophyll-containing cells of a facultative methylotroph, Protaminobacter ruber strain NR-1, contained reaction center bacteriochlorophyll similar to those in many species of purple bacteria and contained a few cytochrome species. α-Peak of the reduced-minus-oxidized difference spectrum of one of the cytochromes was at 554 nm. The midpoint potential of the cytochrome at pH 7 (Em7) was 350 mV. Two other cytochromes had the same reduced-minus-oxidized difference spectra with a split α-band at 557 and 566 nm, but had two different Em7s' of 130 mV and 0 mV.