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Isolation and characterization of a stress-responsive gene encoding a CHRD domain-containing protein from a halotolerant green alga.
Gene 2018 January 16
The genetic basis of stress resistance in extremophilic microalgae is not well studied. In this study, a gene of unknown function, the cluster58 or CL58 gene, was identified from the halotolerant green alga Chlamydomonas W80 and characterized. The CL58 gene encodes a protein containing a domain of unknown function, the CHRD domain, and a putative secretory signaling sequence at its N-terminus. The levels of CL58 mRNA increased in response to high copper levels and low temperatures. When the CL58 gene was heterologously expressed as a fusion gene with the NanoLuc luciferase gene in Chlamydomonas reinhardtii, a majority of the NanoLuc activity was detected in the culture medium compared with that in the intracellular fraction. A mutagenic analysis revealed that the putative secretory signaling sequence was sufficient for the secretion of the CL58-NanoLuc fusion protein. In addition, we expressed the protein encoded by the CL58 gene in Escherichia coli; the recombinant, soluble protein was then purified. In summary, we identified a novel gene from C. W80 that appears to encode a stress-responsive, CHRD domain-containing secreted protein.
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