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• W2051250744 abstract "<ns4:p>The green micro-alga <ns4:italic>Chlamydomonas</ns4:italic> <ns4:italic>reinhardtii</ns4:italic> is an elegant model organism to study oxygenic photosynthesis. Chlorophyll (Chl) and heme are major tetrapyrroles that play an essential role in photosynthesis and respiration. These tetrapyrroles are synthesized via a common branched pathway that involves mainly enzymes, encoded by nuclear genes. One of the enzymes in the pathway is Mg chelatase (MgChel). MgChel catalyzes insertion of Mg<ns4:sup>2+</ns4:sup> into protoporphyrin IX (PPIX, proto) to form Magnesium-protoporphyrin IX (MgPPIX, Mgproto), the first biosynthetic intermediate in the Chl branch. The GUN4 (genomes uncoupled 4) protein is not essential for the MgChel activity but has been shown to significantly stimulate its activity. We have isolated a light sensitive mutant, <ns4:italic>6F14</ns4:italic>,<ns4:italic> </ns4:italic>by random DNA insertional mutagenesis. <ns4:italic>6F14</ns4:italic> cannot tolerate light intensities higher than 90-100 μmol photons m<ns4:sup>-2 </ns4:sup>s<ns4:sup>-1</ns4:sup>. It shows a light intensity dependent progressive photo-bleaching. <ns4:italic>6F14</ns4:italic> is incapable of photo-autotrophic growth under light intensity higher than 100 μmol photons m<ns4:sup>-2 </ns4:sup>s<ns4:sup>-1</ns4:sup>. PCR based analyses show that in <ns4:italic>6F14</ns4:italic> the insertion of the plasmid outside the <ns4:italic>GUN4</ns4:italic> locus has resulted in a genetic rearrangement of the <ns4:italic>GUN4</ns4:italic> gene and possible deletions in the genomic region flanking the <ns4:italic>GUN4</ns4:italic> gene. Our <ns4:italic>gun4</ns4:italic> mutant has a Chl content very similar to that in the wild type in the dark and is very sensitive to fluctuations in the light intensity in the environment unlike the earlier identified <ns4:italic>Chlamydomonas gun4 </ns4:italic>mutant. Complementation with a functional copy of the <ns4:italic>GUN4 </ns4:italic>gene restored light tolerance, Chl biosynthesis and photo-autotrophic growth under high light intensities in <ns4:italic>6F14</ns4:italic>. <ns4:italic>6F14</ns4:italic> is the second <ns4:italic>gun4</ns4:italic> mutant to be identified in <ns4:italic>C. reinhardtii</ns4:italic>. Additionally, we show that our two <ns4:italic>gun4</ns4:italic> complements over-express the GUN4 protein and show a higher Chl content per cell compared to that in the wild type strain.</ns4:p>" @default.
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• W2051250744 date "2013-07-29" @default.
• W2051250744 modified "2023-09-24" @default.
• W2051250744 title "Identification and molecular characterization of the second Chlamydomonas gun4 mutant, gun4-II" @default.
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• W2051250744 doi "https://doi.org/10.12688/f1000research.2-142.v2" @default.
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