Cloning of the Gene Encoding a Protochlorophyllide Reductase : the Physiological Significance of the Co-Existence of Light-Dependent and -Independent Protochlorophyllide Reduction Systems in the Cyanobacterium Plectonema boryanum
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概要
- 論文の詳細を見る
Cyanobacteria have two protochlorophyllide (Pchlide) reductases catalyzing the conversion of Pchlide to chlorophyllide, a key step in the biosynthetic pathway of chlorophylls (Chls); a light-dependent (LPOR) and a light-independent (DPOR) reductase. We found an open reading frame (ORF322) in a 2, 131-bp EcoRI fragment from the genomic DNA of the cyanobacterium Plectonema boryanum. Because the deduced amino acid sequence showed a high similarity to those of various plant LPORs and the LPOR activity was detected in the soluble fraction of Escherichia coil cells over-expressing the ORF322 protein, ORF322 was defined as the por gene encoding LPOR in P.boryanum. A por-disrupted mutant, YFP12, was isolated by targeted mutagenesiss to investigate the physiological importance of LPOR. YFP12 grew as well as wild type under low light conditions (10-25 μE m^<-2>s^<-1>). However, its growth was signigicantly retarded as a result of a significant decrease in its Chl content under higher light conditions (85-130 μE m^<-2>s<-1>). Furthermore, YFP12 stopped growing and suffered from photobleaching under the highest light intensity (170 μE m^<-2>s^<-1>). In contrast, a chlL-disrupted (DPOR-less) mutant YFC2 grew as well as wild type irrespective of light intensity. From these phenotypic characteristics, we concluded that, although both LPOR and DPOR contribute to Chl synthesis in the cells growing in the light, the extent of the contribution by LPOR increase with increasing light intensity; without it, the cells are unable to grow under light intensities of more than 130 μE m^<-2>s^<-1>.
- 日本植物生理学会の論文
著者
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Hase Toshiharu
Division Enzymology
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Fujita Y
Division Of Enzymology Institute For Protein Research Osaka University
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Fujita Y
Department Of Biology Faculty Of Science Osaka University:(present)institute For Protein Research Os
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Fujita Yuichi
Division Of Enzymology Institute For Protein Research Osaka University
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Takagi Hidenori
Division Of Enzymology Institute For Protein Research Osaka University
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Hase T
Inst. Protein Res. Osaka Univ.
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Fujita Y
Fukui Prefectural Univ. Fukui Jpn
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