Ancient Cyanobacteria Reveal Early Evolutionary Steps of Photosynthesis
Scientists studying Gloeobacteria, an ancient lineage of cyanobacteria that diverged over 2 billion years ago, are uncovering how photosynthesis evolved by examining organisms that have changed little since early life. The discovery of a newly identified species, Anthocerotibacter panamensis, uses different light-harvesting proteins than modern cyanobacteria but retains similar underlying structures. Understanding photosynthesis's origins matters because this process fundamentally transformed Earth's atmosphere and enabled the oxygen-dependent life we know today.
Researchers are using ancient cyanobacteria as a genetic time capsule to understand how photosynthesis first evolved billions of years ago. Gloeobacteria, a group that branched off from other cyanobacteria over 2 billion years ago, have remained relatively unchanged over vast evolutionary timescales, offering insights into early photosynthetic mechanisms. The recently identified species Anthocerotibacter panamensis harvests light using a different set of proteins than modern cyanobacteria, yet its underlying protein complexes show only slight variations from other Gloeobacteria. This discovery helps fill a major gap in scientific understanding: while researchers now comprehend photosynthesis in molecular detail through advanced microscopy, the origins of this process in the earliest cyanobacteria remain poorly understood. According to biochemist Robert Blankenship, all photosynthetic protein complexes likely descended from a single common origin, but the nature of that first organism is still unclear. These findings add new dimensions to understanding how life harnessed solar energy to transform Earth's atmosphere with oxygen.
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An Early Step on the Long, Strange Road to Photosynthesis
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