Abstract
The effects of 2-hydroxybiphenyl upon intracytoplasmic membranes of Rhodospirillum rubrum were investigated. At concentrations of 110 and 165 μM of 2-hydroxybiphenyl growth was delayed, it stopped completely at a concentration of 330 μM. In the latter case, instead of vesicular intracytoplasmic membranes concentric membraneous layers were found in electronmicrographs of whole cells. Inhibitor concentrations which still permit growth do not change the general appearance of intracytoplasmic membranes either in situ or in the isolated form. However, the formation of intracytoplasmic membranes was more affected by the presence of the inhibitor than was growth. Although by electron microscopy no effect of 2-hydroxybiphenyl on intracytoplasmic membranes could be revealed there were considerable influences on membrane composition. This concerned the formation of colored carotenoids and specifically the patterns of membrane proteins.
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