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Shedding new light on viral photosynthesis

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Abstract

Viruses infecting the environmentally important marine cyanobacteria Prochlorococcus and Synechococcus encode ‘auxiliary metabolic genes’ (AMGs) involved in the light and dark reactions of photosynthesis. Here, we discuss progress on the inventory of such AMGs in the ever-increasing number of viral genome sequences as well as in metagenomic datasets. We contextualise these gene acquisitions with reference to a hypothesised fitness gain to the phage. We also report new evidence with regard to the sequence and predicted structural properties of viral petE genes encoding the soluble electron carrier plastocyanin. Viral copies of PetE exhibit extensive modifications to the N-terminal signal peptide and possess several novel residues in a region responsible for interaction with redox partners. We also highlight potential knowledge gaps in this field and discuss future opportunities to discover novel phage–host interactions involved in the photosynthetic process.

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Acknowledgments

Members of the Scanlan laboratory are currently funded by the Natural Environment Research Council (NERC) and the EU. RJP was the recipient of a NERC funded PhD studentship. The authors wish to thank Prof. S. W. Chisholm and the Warwick Life Sciences Imaging Suite for use of TEM images. We thank the Genoscope (Evry, France) for whole genome sequencing of 25 currently unpublished Synechococcus strains obtained in the framework of the METASYN project led by Dr. Laurence Garczarek (CNRS Roscoff, France) and accessed through Cyanorak (http://www.sb-roscoff.fr/cyanorak/).

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Correspondence to David J. Scanlan.

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Puxty, R.J., Millard, A.D., Evans, D.J. et al. Shedding new light on viral photosynthesis. Photosynth Res 126, 71–97 (2015). https://doi.org/10.1007/s11120-014-0057-x

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  • DOI: https://doi.org/10.1007/s11120-014-0057-x

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