Chemical Signals as Attractants, Repellents and Aggregation Stimulants
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منابع مشابه
Chemical probes of bacterial signal transduction reveal that repellents stabilize and attractants destabilize the chemoreceptor array.
The signal transduction cascade responsible for bacterial chemotaxis serves as a model for understanding how cells perceive and respond to their environments. Bacteria react to chemotactic signals by migrating toward attractants and away from repellents. Recent data suggest that the amplification of attractant stimuli depends on receptor collaboration: occupied and unoccupied chemoreceptors act...
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Plasmodium of slime mould Physarum polycephalum is a large single celled organism visible unaided by the eye. This slime mould is capable of optimising the shape of its protoplasmic networks in spatial configurations of attractants and repellents. Such adaptive behaviour can be interpreted as computation. When exposed to attractants and repellents, Physarum changes patterns of its electrical ac...
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The wave forms and activity patterns of Caenorhabditis elegans were examined on agar in the presence of known chemical attractants (NaCl) and repellents (D-tryptophan), and in thermal gradients. Total activity was reduced in both attractants and repellents. Different combinations of transfers between chemicals were investigated. Two thresholds were found for NaCl: 10(-3) M NaC1 caused reduced a...
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The motile response of Escherichia coli bacteria to attractants and repellents is one of the best-understood examples of a signal transduction pathway. A number of recent studies suggest that the receptors in this system undergo major changes in both their degree of structural order and their state of aggregation in the membrane. We discuss the thermodynamic basis for this effect and argue that...
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The ability of attractants and repellents to affect the turnover of methyl groups on the methyl-accepting chemotaxis proteins (MCPs) was examined for Bacillus subtilis. Attractants were found to cause an increase in the turnover of methyl groups esterified to the MCPs, while repellents caused a decrease. These reactions do not require CheW. However, a cheW null mutant exhibits enhanced turnover...
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