Book ChapterDOI
Circadian Clocks in Cyanobacteria
Susan E. Cohen
- pp 169-180
TLDR
The current understanding of the S. elongatus circadian oscillator, its synchronization with the environment, and its coordination with cellular activities is highlighted.Abstract:
Circadian rhythms, which are oscillations in biological activity that occur with ~24-h periodicity and driven by a circadian clock, function to anticipate daily environmental changes and can be found ubiquitously throughout nature. Cyanobacteria are the only prokaryotes known to have a rigorously tested and robust circadian clock. Synechococcus elongatus PCC 7942 is the paradigm for our understanding of circadian rhythms in prokaryotes. The KaiABC posttranslational oscillator drives 24-h rhythmicity in cyanobacteria and has been studied in exquisite detail. Here, the current understanding of the S. elongatus circadian oscillator, its synchronization with the environment, and its coordination with cellular activities is highlighted.read more
Citations
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Posted ContentDOI
Spatio-temporal coherence of circadian clocks and gating of differentiation in Anabaena filaments
Rinat Arbel-Goren,Bareket Dassa,Anna Zhitnitsky,Ana Valladares,Antonia Herrero,Enrique Flores,Joel Stavans +6 more
TL;DR: In this article , the expression of a clock-controlled gene under nitrogen deprivation, at the level of individual cells, was investigated and it was shown that differentiation into heterocysts took place preferentially within a limited interval of the circadian clock cycle.
References
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Journal ArticleDOI
Circadian rhythms from multiple oscillators: lessons from diverse organisms
Deborah Bell-Pedersen,Vincent M. Cassone,David J. Earnest,David J. Earnest,Susan S. Golden,Paul E. Hardin,Terry L. Thomas,Mark J. Zoran +7 more
TL;DR: Comparisons of circadian clocks in unicellular and multicellular organisms using molecular genetics and genomics have provided new insights into the mechanisms and complexity of clock systems.
Journal ArticleDOI
Reconstitution of circadian oscillation of cyanobacterial KaiC phosphorylation in vitro
Masato Nakajima,Keiko Imai,Hiroshi Ito,Taeko Nishiwaki,Yoriko Murayama,Hideo Iwasaki,Tokitaka Oyama,Takao Kondo +7 more
TL;DR: The self-sustainable oscillation of KaiC phosphorylation in vitro is reconstituted by incubating KaiC with KaiA, KaiB, and adenosine triphosphate and the enigma of the circadian clock can now be studied in vitro by examining the interactions between three Kai proteins.
Journal ArticleDOI
Peroxiredoxins are conserved markers of circadian rhythms
Rachel S. Edgar,Edward W. Green,Yuwei Zhao,Gerben van Ooijen,María Teresa Camacho Olmedo,Ximing Qin,Yao Xu,Min Pan,Utham K. Valekunja,Kevin A. Feeney,Elizabeth S. Maywood,Michael H. Hastings,Nitin S. Baliga,Martha Merrow,Andrew J. Millar,Carl Hirschie Johnson,Charalambos P. Kyriacou,John S. O’Neill,Akhilesh B. Reddy +18 more
TL;DR: It is shown that oxidation–reduction cycles of peroxiredoxin proteins constitute a universal marker for circadian rhythms in all domains of life, by characterizing their oscillations in a variety of model organisms and exploring the interconnectivity between these metabolic cycles and transcription–translation feedback loops of the clockwork in each system.
Journal ArticleDOI
Expression of a gene cluster kaiABC as a circadian feedback process in cyanobacteria.
Masahiro Ishiura,Shinsuke Kutsuna,Setsuyuki Aoki,Hideo Iwasaki,Carol R. Andersson,Carol R. Andersson,Akio Tanabe,Susan S. Golden,Carl Hirschie Johnson,Takao Kondo +9 more
TL;DR: A negative feedback control of kaiC expression by KaiC generates a circadian oscillation in cyanobacteria, and KaiA sustains the oscillation by enhancing kaiA expression.
Journal ArticleDOI
Resonating circadian clocks enhance fitness in cyanobacteria
TL;DR: This work tested the adaptive significance of circadian programming by measuring the relative fitness under competition between various strains of cyanobacteria expressing different circadian periods and found strains that had a circadian period similar to that of the light/dark cycle were favored under competition in a manner that indicates the action of soft selection.
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