Characterization of two plastid σ factors, SigA1 and SigA2, that mainly function in matured chloroplasts in Nicotiana tabacum

Oikawa, Kosuke; Fujiwara, Makoto; Nakazato, Emi; Tanaka, Kan; Takahashi, Hideo

doi:10.1016/s0378-1119(00)00505-9

Cited by 33 publications

(15 citation statements)

References 21 publications

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“…However, as shown for tobacco, mRNA levels augment considerably in later developmental stages when compared to 4-days-old seedlings (Ishizaki et al 2005). Transcript fluctuation of SIG1 mRNA according to an endogenous rhythm has been described for photomixotrophically cultured tobacco cells (Oikawa et al 2000), during germination and early seedling development of Arabidopsis (Kanamaru et al 1999) and in young wheat seedlings (Morikawa et al 1999). In 4-weeks-old, dark-adapted, Arabidopsis plants SIG1 transcription is strongly and rapidly induced by red light as well as by blue light (Onda et al 2008).…”

Section: Specific Functions Of Plant Sigma Factorsmentioning

confidence: 76%

Function of plastid sigma factors in higher plants: regulation of gene expression or just preservation of constitutive transcription?

Lerbs-Mache

2010

Plant Mol Biol

119

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Plastid gene expression is rather complex. Transcription is performed by three different RNA polymerases, two of them are nucleus-encoded, monomeric, of the phage-type (named RPOTp and RPOTmp) and one of them is plastid-encoded, multimeric, of the eubacterial-type (named PEP). The activity of the eubacterial-type RNA polymerase is regulated by up to six nucleus-encoded transcription initiation factors of the sigma-type. This complexity of the plastid transcriptional apparatus is not yet well understood and raises the question of whether it is subject to any regulation or just ensures constitutive transcription of the plastid genome. On the other hand, considerable advances have been made during the last years elucidating the role of sigma factors for specific promoter recognition and selected transcription of some plastid genes. Sigma-interacting proteins have been identified and phosphorylation-dependent functional changes of sigma factors have been revealed. The present review aims to summarize these recent advances and to convince the reader that plastid gene expression is regulated on the transcriptional level by sigma factor action.

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Section: Specific Functions Of Plant Sigma Factorsmentioning

confidence: 76%

Function of plastid sigma factors in higher plants: regulation of gene expression or just preservation of constitutive transcription?

Lerbs-Mache

2010

Plant Mol Biol

119

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“…The expression of plastid sigma factors seems to be differentially regulated during early Arabidopsis development (Kanamaru et al, 1999;Lahiri and Allison, 2000;Homann and Link, 2003;Privat et al, 2003;Kasai et al, 2004;Nagashima et al, 2004b;Fey et al, 2005;Ishizaki et al, 2005) and to be regulated by circadian rhythms (Nakahira et al, 1998;Kanamaru et al, 1999;Morikawa et al, 1999;Oikawa et al, 2000;Ichikawa et al, 2004).…”

Section: Nuclear-encoded Plastid Sigma Factorsmentioning

confidence: 99%

“…Sigma factors are good candidates to represent such factors, regulation of their expression by circadian or diurnal rhythms has been described (Tozawa et al, 1998;Kanamaru et al, 1999;Lahiri et al, 1999;Morikawa et al, 1999;Oikawa et al, 2000;Ichikawa et al, 2004). Factors, which are proposed to integrate light and circadian control in the regulation of chloroplast development, are PIF1 and PIF3 (phytochrome interacting factor), a control that might involve AthSig5 (Monte et al, 2004;Tepperman et al, 2006;Stephenson et al, 2009).…”

Section: Exogenous and Endogenous Factors Affecting Plastid Transcripmentioning

confidence: 99%

The transcription machineries of plant mitochondria and chloroplasts: Composition, function, and regulation

Liere

Weihe

Börner

2011

Journal of Plant Physiology

200

174

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“…Isono et al 1997;Tozawa et al 1998;Lahiri et al 1999). In addition, there is evidence of circadian regulation of expression for some members of the sigma factor gene families (Kanamaru et al 1999;Morikawa et al 1999;Harmer et al 2000;Oikawa et al 2000). Thus, the presence of multiple sigma factors allows for the regulation of plastid transcription in response to various environmental and endogenous signals.…”

Section: Introductionmentioning

confidence: 99%

Structure, circadian regulation and bioinformatic analysis of the unique sigma factor gene in Chlamydomonas reinhardtii

et al. 2004

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In higher plants, the transcription of plastid genes is mediated by at least two types of RNA polymerase (RNAP); a plastid-encoded bacterial RNAP in which promoter specificity is conferred by nuclear-encoded sigma factors, and a nuclear-encoded phage-like RNAP. Green algae, however, appear to possess only the bacterial enzyme. Since transcription of much, if not most, of the chloroplast genome in Chlamydomonas reinhardtii is regulated by the circadian clock and the nucleus, we sought to identify sigma factor genes that might be responsible for this regulation. We describe a nuclear gene (RPOD) that is predicted to encode an 80 kDa protein that, in addition to a predicted chloroplast transit peptide at the N-terminus, has the conserved motifs (2.1- 4.2) diagnostic of bacterial sigma-70 factors. We also identified two motifs not previously recognized for sigma factors, adjacent PEST sequences and a leucine zipper, both suggested to be involved in protein-protein interactions. PEST sequences were also found in approximately 40% of sigma factors examined, indicating they may be of general significance. Southern blot hybridization and BLAST searches of the genome and EST databases suggest that RPODmay be the only sigma factor gene in C. reinhardtii. The levels of RPODmRNA increased 2- 3-fold in the mid-to-late dark period of light-dark cycling cells, just prior to, or coincident with, the peak in chloroplast transcription. Also, the dark-period peak in RPOD mRNA persisted in cells shifted to continuous light or continuous dark for at least one cycle, indicating that RPODis under circadian clock control. These results suggest that regulation of RPODexpression contributes to the circadian clock's control of chloroplast transcription.

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Characterization of two plastid σ factors, SigA1 and SigA2, that mainly function in matured chloroplasts in Nicotiana tabacum

Cited by 33 publications

References 21 publications

Function of plastid sigma factors in higher plants: regulation of gene expression or just preservation of constitutive transcription?

Function of plastid sigma factors in higher plants: regulation of gene expression or just preservation of constitutive transcription?

The transcription machineries of plant mitochondria and chloroplasts: Composition, function, and regulation

Structure, circadian regulation and bioinformatic analysis of the unique sigma factor gene in Chlamydomonas reinhardtii

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