Abstract
In Halobacterium halobium tactic responses towards light and chemoeffectors are accompanied by changes in the methylation level of methyl-accepting chemotaxis proteins (MCP). Taxis towards green light absorbed by the bacteriorhodopsin proton pump appears to be governed by Δ μ H + -sensing. The addition of CCCP, an uncoupler, prevented the increase of MCP methylation in response to green light illumination, but had no effect on CH 3-incorporation followed by the addition of the attractants glucose, leucine and histidine. Similarly, CCCP did not change MCP demethylation in response to blue light illumination, a repelling stimuli. The sensitivity to an uncoupler of methylation linked to Δ μ H + -mediated green light taxis is to be expected, while the independence of demethylation caused by the blue light of CCCP is an indication that in the latter case a specific photoreceptor governs phototaxis. Informed processing from the blue light receptor to MCP does not involve a change in the membrane potential.
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