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10244236286
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note
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Tar-A198EΔSfu lacks three-quarters of the signaling region but retains the first three methylation sites (K1 region). Tar-A198EΔKpn completely lacks the signaling region. Tar-A198EΔTth lacks the first two-thirds of the cytoplasmic signaling domain and retains the COOH-terminal 160 residues, including the fourth methylation site (R1 region). Tar-A198EΔNde, Tar-A198EΔBstP, Tar-A198EΔBsrF, and Tar-A198EΔNru lack part of the linker region and all of the signaling domain. When expressed in strain RP4372recA, none of these mutant receptors mediated an aspartate response (Fig. 2).
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25
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0019811903
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This strain produces only the ribose-galactose chemoreceptor Trg [F thi thr leu met eda rpsL Δ(tar-tap)5201 tsr-1; A. Boyd, A. Krikos, M. I. Simon, Cell 26, 333 (1981)].
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10244227686
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note
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We also examined swarming abilities of the cells in tryptone semisolid agar (0.25%). Many of them swarmed, whereas cells expressing Tar-A198EΔTth, Tar-A198EΔBstP, Tar-A198EΔBsrF, and Tar-A198EΔNru did not. However, even those cells that did not swarm responded to aspartate (Fig. 2).
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K. Oosawa and Y. Imae, J. Bacteriol. 154, 104 (1983); ibid. 157, 576 (1984).
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0023213791
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which lacks all four chemoreceptors, was used as a host, cells coexpressing Tar-A19K and one of the deleted versions of Tar responded to glycerol, whereas cells expressing only Tar-A19K did not respond. Therefore, the Tar-A19K homodimer seems to lack the ability to mediate a glycerol response
-
Cells expressing only Tar-A19K also responded to 1 M glycerol (Fig. 2, A to G). However, when strain HCB339 [A. J. Wolfe, M. P. Conley, T. J. Kramer, H. C. Berg, J. Bacteriol. 169, 1878 (1987)]. which lacks all four chemoreceptors, was used as a host, cells coexpressing Tar-A19K and one of the deleted versions of Tar responded to glycerol, whereas cells expressing only Tar-A19K did not respond. Therefore, the Tar-A19K homodimer seems to lack the ability to mediate a glycerol response.
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10244235011
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note
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Similar results were obtained with strain HCB339 as the host, suggesting that Trg is not responsible for the aspartate responses of RP4372recA cells expressing the heterodimers.
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32
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10244256108
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note
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154 is in contact with aspartate is responsible for signal production (16).
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35
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0029979271
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discuss possible mechanisms for such indirect interaction
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10244220817
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note
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We thank M. D. Manson and P. J. Gardina for communicating unpublished results and for helpful discussions. Supported in part by grants-in-aid for scientific research to I.K. from the Ministry of Education, Science, and Culture of Japan.
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