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Bacterial Signaling

Bacterial Signaling

Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...

Contact-dependent Signaling

Contact-dependent Signaling

Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...

What is Cell Signaling?

What is Cell Signaling?

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.

What is Cell Signaling?

What is Cell Signaling?

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate to respond to the environment.

Overview of Cell Signaling

Overview of Cell Signaling

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
Cells respond to many types of information, often through receptor proteins positioned on the membrane. For example, skin cells respond to and transmit touch...

Overview of Cell Signaling

Overview of Cell Signaling

Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
Cells respond to many types of information, often through receptor proteins positioned on the membrane. For example, skin cells respond to and transmit touch...

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Related Experiment Video

Updated: May 12, 2026

Using Coculture to Detect Chemically Mediated Interspecies Interactions

Using Coculture to Detect Chemically Mediated Interspecies Interactions

Published on: November 1, 2013

Small talk. Cell-to-cell communication in bacteria.

Bonnie L Bassler¹

¹Department of Molecular Biology, Princeton University, NJ 08544, USA. bbassler@molbio.princeton.edu

|June 28, 2002

Summary

Bacteria use quorum sensing to communicate and coordinate behaviors, functioning like a multicellular organism. This process involves chemical signals and detection systems, enabling productive relationships between bacterial species.

Area of Science:

Microbiology
Bacterial Communication

Background:

Bacteria exhibit complex social behaviors.
Coordinated group actions are crucial for bacterial survival and function.

Purpose of the Study:

To explain the process of bacterial quorum sensing.
To highlight the role of chemical signaling in bacterial interactions.

Main Methods:

Review of quorum sensing mechanisms.
Analysis of signal molecules and detection systems.

Main Results:

Quorum sensing allows bacteria to act as a collective.
Diverse chemical signals mediate intra- and interspecies communication.

Conclusions:

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Quorum sensing is a fundamental bacterial behavior.
Chemical communication underpins cooperative bacterial activities.