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. 1989 Aug;90(4):1600–1608. doi: 10.1104/pp.90.4.1600

Comparison of Phase Shifts of the Circadian Rhythm of K+ Uptake in Lemna gibba G3 by Various Amino Acid Analogs

Takao Kondo 1
PMCID: PMC1061930  PMID: 16666970

Abstract

Phase shifts of the circadian rhythm of K+ uptake by Lemna gibba G3, caused by pulse administration of various amino acids analogs, were examined and compared. The various phase shifts were not due to any disturbance in the biosynthesis of amino acids, since the effective time of day and direction of the phase shift caused by analogs were not correlated with the standard amino acid which was modified. Effective analogs could be classified into three groups. The first group was effective during the middle subjective day and caused both advances and delays in phase. The second group was effective early in the subjective night, causing large delays and small phase advance. Analogs in the third group shifted the phase as did cycloheximide and were effective at the subjective dawn. Since the analogs of the third group were known to inhibit protein synthesis, it is likely that they shift the phase by lowering the level of some protein(s) important for the clock. By contrast, since the analogs in groups 1 and 2 are known to generate abnormal proteins, the different phase-shifting patterns caused by analogs in groups 1 and 2 suggest that at least two other proteins are important for the circadian timing loop. The amino acid analogs shift the phase as a result of their incorporation into these proteins instead of the standard amino acid. This probably alters the structure and/or activities of these proteins.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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