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Attack of the cannibalistic bacteria

John Travis

photo

Losick et al./Science

When the going gets tough, watch out for Bacillus subtilis. The green rods in this micrograph are living members of this bacterial species that have killed nearby B. subtilis members (red rods) for food. Like many soil-dwelling bacteria, B. subtilis forms a hardy spore when confronted with rough conditions. Before irreversibly committing to sporulation, however, some of these microbes secrete two proteins, Richard Losick of Harvard University and his colleagues report in an upcoming Science. One protein delays sporulation in adjacent B. subtilis members, and the second bursts the neighbors, liberating nutrients from them. This cannibalistic behavior is unusual. "It came as a big surprise because here the bacterium is making an antibiotic to kill its own siblings," says Losick. "It's fratricide."

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References:

Gonzalez-Pastor, J.E., E.C. Hobbs, and R. Losick. In press. Cannibalism by sporulating bacteria. Science. Abstract.

Sources:

Richard Losick
Department of Molecular and Cellular Biology
The Biological Laboratories
Harvard University
16 Divinity Avenue
Cambridge, MA


From Science News, Volume 163, No. 25, June 21, 2003, p. 390.