Most bacteria, including many bacterial pathogens, are surrounded by an outer protective layer of sugar molecules, known as a capsule. This primarily protects the bacteria from environmental influences, but also serves as a kind of cloak of invisibility, enabling them to evade the phagocytes of our immune system. Structural biologists at the Helmholtz Center for Infection Research (HZI) have now used cryo-electron microscopy to visualize the central Wza-Wzc protein complex, with which sugar molecules pass from the interior of the bacterial cell to the outside, in three dimensions at the atomic level for the first time.

Most bacteria, including many bacterial pathogens, are surrounded by an outer protective layer of sugar molecules, known as a capsule. This primarily protects the bacteria from environmental influences, but also serves as a kind of cloak of invisibility, enabling them to evade the phagocytes of our immune system. Structural biologists at the Helmholtz Center for Infection Research (HZI) have now used cryo-electron microscopy to visualize the central Wza-Wzc protein complex, with which sugar molecules pass from the interior of the bacterial cell to the outside, in three dimensions at the atomic level for the first time.

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