Identification of two clock proteins in acetabularia cliftonii and construction of cDNA libraries from Acetabularia cliftonii and Acetabularia mediterranea

Yang, Xiao‐Ping; Groot, E.J. de

doi:10.1016/0020-711x(92)90385-e

Cited by 8 publications

(5 citation statements)

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“…The mechanisms of the circadian clocks of the other photoperiodic examples given in the following are mentioned under the corresponding sections. Circadian rhythms have been found in cyanobacteria (Qin et al 2010;Brunner et al 2008), and they are common among eukaryotic algae such as Euglena (Mittag 2001), Chlamydomonas (Schulze et al 2010), Acetabularia (Yang and de Groot 1992), and Lingulodinium (Wagner et al 2005). Here, we select Synechococcus elongatus as a cyanobacterium, the smallest known eukaryote Ostreococcus tauri, the more complicated and 30 times larger Chlamydomonas (see Sect.…”

Section: Circadian Rhythms and Photoperiodic Reactions In Algaementioning

confidence: 99%

Photoperiodism: The Calendar of Plants

Engelmann

2015

Rhythms in Plants

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The daylength varies with the time of the year and can thus be used by plants-and other organisms-to react photoperiodically in developmental steps and morphological features such as cyst formation, germination of zygospores and cell division in certain algae, succulence of stems and leaves, formation of storage organs, and flower induction. The functioning and molecular bases of circadian clocks of plants are mentioned and shown how they are entrained to the day, and whether they are involved in photoperiodic timing. Seasonal aspects for various crops and the evolution of photoperiodism are briefly touched upon.

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Section: Circadian Rhythms and Photoperiodic Reactions In Algaementioning

confidence: 99%

Photoperiodism: The Calendar of Plants

Engelmann

2015

Rhythms in Plants

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“…Circadian rhythms are also found in eukaryotic algae such as Euglena (Mittag 2001), Chlamydomonas (Schulze et al 2010), Acetabularia (Yang and de Groot 1992), and Lingulodinium (Wagner et al 2005). As an example, we will select an extreme, the smallest known, eukaryote Ostreococcus tauri and mention additionally the more complicated and 30 times larger Chlamydomonas.…”

Section: Algal Clocks: From Simple To Complexmentioning

confidence: 99%

How Light Resets Circadian Clocks

2014

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The daily revolutions of the earth around its axis are responsible for day and night and its annual orbit around the sun for the seasons with their fluctuations in day length. Most organisms have adapted to these diurnal and annual cycles. The strategies and mechanisms used are quite delicate and complicated.It came as a surprise that photosynthesis and many other processes are, however, additionally controlled by internal clocks. Thus, photosynthesis fluctuates not only during the daily light-dark cycle (=LD; see the List of Abbreviations and http://www.circadian.org/dictionary.html) but also when the plants are kept under LL and constant temperature (Hennessey and Field 1991). However, the period length (period for short) of this rhythmic event then deviates from exactly 24 h and is therefore called circadian (from Latin circa, about, and dies, day). If in the absence of LD and temperature cycles other 24 h time cues (also called zeitgeber, German for time giver) would control the rhythm, it should show an exact 24 h rhythm. This is not the case, demonstrating the endogenous nature of a clock that is locked to light signals (see Fig. 18.1). Spectrum of RhythmsEndogenous rhythms of organisms are not only tuned to the daily cycle of 24 h. The range of rhythms found in organisms covers ultradian (with periods of several hours to very short ones), circadian, and annual (with periods of about a year) rhythms. Other rhythms such as tidal, 14-day, and monthly ones cope with influences of the moon on the earth, mainly on the water movements of the oceans, and they are therefore found in organisms at the coasts and in the sea. Annual rhythms interact with the day-length changes during the year (see below). There are furthermore rhythms with periods covering several years. The following discussion of a "biological clock" is restricted to circadian rhythms. Even they are often not just composed of one clock type but form a "circadian system" consisting of two or more clocks with different prop- Function of Circadian ClocksThe term "clock" usually implies a time-measuring device or function. For instance, the day length (or night length) can be determined by an organism. Since day length is a function of the time of the year (long days in summer, short days in winter), it can be used to time certain events such as flowering or tuber formation of a plant or breeding of birds and mammals during the most appropriate season. These processes are denoted photoperiodism (see Chap. 19).However, a clock can also be used to set a certain temporal order. For instance, the circadian control of our sleepwake cycle ensures that we rise in the morning and fall asleep in the evening at a preferred time. Food intake and digestion are likewise controlled by this clock and gated to certain times of the day (Silver et al. 2011;Duguay and Cermakian 2009;Forsgren 1935). The circadian clock will time these events also under constant conditions. Furthermore, circadian clocks can serve as alarm clocks.

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“…Before annealing, ATF/AatII-1 and ATF/AatII-2 were phosphorylated with T4 polynucleotide kinase (separately, since the end created by cleavage of DNA with AatII is 5' recessed, and DNA molecules with recessed 5' ends are labeled less efficiently with polynucleotide kinase than are molecules with protruding 5' ends). coli JM 109 competent cells and transformation were the same as those described previously [32]. The oligodeoxynucleotides containing different repeats of ATF/AatII were isolated from a native 12 % polyacrylamide gel.…”

Section: Oiigodeoxynucleotides and Plasmid Dnamentioning

confidence: 99%

Human DNA polymerase-β promoter: Phorbol ester activation is mediated through the cAMP response element and cAMP-response-element-binding protein

Yang

Rawson

et al. 1997

J Biomed Sci

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That mammalian DNA polymerase-beta (beta-pol) gene transcription is upregulated by activated ras and also by phorbol ester (TPA) treatment suggests the involvement of protein kinase C in the gene expression control for this DNA repair enzyme. Yet, the core promoters of the human, bovine and rodent beta-pol genes do not have a TPA response element or other binding site for the transcriptional activator AP-1. Instead, these beta-pol promoters appear to be regulated mainly by proteins binding to the cAMP response element (CRE) centered within 50 bp 5' of the transcriptional start site. In this study, the CRE in the human beta-pol promoter was found to mediate TPA upregulation of the cloned promoter in HeLa cell transient expression experiments. To further examine the role of this CRE in TPA stimulation, we used several mutated promoters that were either deficient in protein binding to the CRE or contained extra CRE sites arranged as tandem repeats. All constructs with at least one functional CRE were upregulated by TPA, whereas mutants lacking CRE protein-binding function were not TPA upregulated. Analyses of HeLa nuclear extract DNA-binding proteins indicated that the beta-pol CRE was bound by CRE-binding protein (CREB) family members CREB-1 and activating transcription factor-1, but not by AP-1 or complexes containg AP-1 subunits. These results suggest that CREB, rather than AP-1 proteins, are required for the CRE-mediated TPA activation of the beta-pol promoter.

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Identification of two clock proteins in acetabularia cliftonii and construction of cDNA libraries from Acetabularia cliftonii and Acetabularia mediterranea

Cited by 8 publications

References 28 publications

Photoperiodism: The Calendar of Plants

Photoperiodism: The Calendar of Plants

How Light Resets Circadian Clocks

Human DNA polymerase-β promoter: Phorbol ester activation is mediated through the cAMP response element and cAMP-response-element-binding protein

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