Prochlorococcus Marinus' DNA Cross-feeding

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Phys Org

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An abundant phytoplankton feeds a global network of marine microbes

Summary

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Prochlorococcus marinus is the most abundant photosynthesizing organism on the planet.

Microbes shed extra compounds into their surroundings, where they are then "cross-fed," or taken up by other organisms.

This cross-feeding interaction could be an important regulator of the ocean carbon cycle.

Prochlorococcus appears to make the most of the compounds, then cast off what they can't.

The team looked at the genomes of more than 300 heterotrophic microbes that consume organic carbon rather than making it themselves through photosynthesis.

They found that genes involved in recycling purine and pyridine peak several hours after the recognized peak in genome replication at dusk .

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