Journal
JOURNAL OF BACTERIOLOGY
Volume 183, Issue 1, Pages 171-177Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.183.1.171-177.2001
Keywords
-
Categories
Funding
- NATIONAL INSTITUTE OF GENERAL MEDICAL SCIENCES [R01GM058050] Funding Source: NIH RePORTER
- NIGMS NIH HHS [GM58050] Funding Source: Medline
Ask authors/readers for more resources
Photosynthetic bacteria respond to alterations in light conditions by migrating to locations that allows optimal use of light as an energy source. Studies have indicated that photosynthesis-driven electron transport functions as an attractant signal for motility among purple photosynthetic bacteria, However, it is unclear just how the motility-based signal transduction system monitors electron how through photosynthesis-driven electron transport. Recently, we have demonstrated that the purple photosynthetic bacterium Rhodospirillum centenum is capable of rapidly moving swarm cell colonies toward infrared light as well as away from visible light. Light-driven colony motility of R. centenum has allowed us to perform genetic dissection of the signaling pathway that affects photosynthesis-driven motility, In this study, we have undertaken sequence and mutational analyses of one of the components of a signal transduction pathway, Ptr, which appears responsible for transmitting a signal from the photosynthesis-driven electron transport chain to the chemotaxis signal transduction cascade. Mutational analysis demonstrates that cells disrupted for ptr are defective in altering motility in response to light, as well as defective in light-dependent release of methanol. We present a model which proposes that Ptr senses the redox state of a component in the photosynthetic cyclic electron transport chain and that Ptr is responsible for transmitting a signal to the chemotaxis machinery to induce a photosynthesis-dependent motility response.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available