Credit: SPbU
Scientists from Russia, Austria, and the USA have discovered virus-like particles in the bacterial symbionts of Bryozoa - a phylum of colonial aquatic invertebrates - filter-feeders dominating in many bottom ecosystems. The research project was planned and supervised by scientists from St Petersburg University. Some of the virus-like particles resemble red blood cells, while others have a sea-urchin-like appearance. Although viruses have never been reported inside symbiotic bacteria in bryozoans, scientists suggest that this matryoshka doll may have a prominent effect on the bacterial hosts.
Life of most organisms on our planet is closely associated with bacterial communities - microbiota that plays a very important role in the health of the host from helping to control digestion to protection of the host from infections. Bryozoa are not an exception. Inside some of these invertebrates the symbiotic bacteria live that, e.g. make larvae not eatable for fish. Yet how
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Credit: Britvin et al / Geology, 2020
Phosphorus is an element essential for life. It is fundamental to all living organisms, and is a key component of RNA, DNA, and cell membranes. Phosphorus compounds must have been involved in the emergence of primordial life. Importantly though, these compounds were water soluble and reactive so that they could participate in various chemical processes. Only in this case could phosphorus be involved in phosphorylation, which enables the synthesis of complex molecules. However, phosphorus in nature is only found as a phosphate ion in fairly inert minerals of the phosphate class. Hence, phosphate minerals are unlikely to have been a source for the prebiotic synthesis of phosphorus-containing compounds - the precursors of the first living organisms. For scientists, it remains a mystery which phosphorus compounds contributed to the appearance of the building blocks of RNA and DNA molecules.