What are Saccharibacteria?

Saccharibacteria are a group of obligate parasitic bacteria that depend on host bacteria for nutrients.

Why is microaerobic condition important?

Microaerobic conditions are optimal for the growth of certain host bacteria, promoting their proliferation.

Cultures should be passaged every two to three days to maintain viability and growth.

The growth of host bacteria slows down, leading to reduced turbidity in the culture.

This study provides insights into the cultivation and interaction dynamics between Saccharibacteria and their host bacteria.

JoVE Encyclopedia of Experiments

Microbiology

0 views • 2:05 min • September 26th, 2025

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Begin with a sterile tube containing a host-specific growth medium. Add an overnight-grown host bacterial culture.

Then, introduce a filtrate containing Saccharibacteria, a parasitic ultrasmall bacteria, to establish a binary culture.

Incubate the binary culture under microaerobic conditions that are optimal for the host bacteria.

The nutrients in the medium promote the growth and proliferation of host bacteria, making the culture turbid.

Due to their obligate parasitic nature, Saccharibacteria attach to the surface of the host bacterial cells.

These bacteria then form close membrane contacts with the host and extract nutrients essential for their survival and proliferation.

As infection progresses, the growth of the bacterial host slows down, resulting in reduced turbidity.

To support continued growth, transfer the binary culture into fresh medium at regular intervals.

This maintains host viability and promotes the long-term stability of the binary culture.

Prepare culture tubes by aliquoting two milliliters of appropriate growth media into the tubes.

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Last updated: 27 June 2026