By Seares F.H.
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Extra resources for A Simple Method for Determining the Colors of the Stars (1916)(en)(5s)
Williams Diversity in the basic circadian timing system is evidently on the input side of the process. Briefly, the S. elongatus CikA protein is thought to be a light-responsive redox sensor that relays information into the central timing mechanism through the KaiA protein (see Chap. 8). Structure and function information regarding KaiA can be found in Chap. 6. 1 has a CikA or KaiA protein; and the listed marine Synechococcus species have typical KaiA proteins but seem not to have CikA. If we assume that these species all have functional circadian timing systems, based upon the likely presence of KaiB, KaiC, and SasA, then clearly the mechanism by which information flows into the timing system is different in these marine organisms than it is in the terrestrial and even freshwater organisms.
1 Some cyanobacteria and a subset of their circadian clock-related proteins. Information in this table is taken primarily from the NCBI database. Only 30 of the 39 listed organisms have had their genomes completely sequenced. Common habitat and metabolic characteristics are abbreviated as follows: F freshwater, M marine, R plant root-associated, T terrestrial; chl chlorophyll, f filaments, H heterocyst-forming, N nitrogen-fixing, u unicells. Clock-related proteins lists the putative number of amino acyl residues encoded by the relevant gene (percent sequence identity with the S.
Our question remains: is it possible that a single type of circadian timing system functions within all of these organisms? The Kai proteins are the central components of the circadian timing mechanism in S. elongatus. The CikA protein is a primary timing-input device (see Chaps. 8, 10) and the SasA protein is a primary timing-output device (see Chap. 9). 1 are remarkably similar to one another. With the exception of G. violaceus, which evidently does not have a circadian timing system, all listed organisms have a putative KaiC protein that is approximately 500 amino acyl residues in length and has at least 73% sequence identity with the S.