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Chapter 14: Problem 10

What is diauxic growth? Explain the roles of cAMP and CAP in this process.

Short Answer

Expert verified
Diauxic growth is a two-phase bacterial growth pattern using two different types of nutrients, primary and secondary, successively. The interplay between cAMP and CAP is crucial for this process. The exhaustion of the primary nutrient increases the level of cAMP, signaling energy scarcity, which then binds to and activates CAP. Active CAP induces the transcription of genes necessary for the utilization of the secondary nutrient, allowing the bacteria to shift from using the primary to the secondary nutrient.

Step by step solution

01

Understanding Diauxic Growth

Diauxic growth is a type of bacterial growth that is characterized by two distinct phases. Initially, bacteria grow quickly by using a primary nutrient. Once this nutrient has been used up, there is a period of slow growth or stagnation, called the lag phase. After some time, bacteria adapt and begin to use a secondary nutrient, fostering slower growth.
02

Role of cAMP in Diauxic Growth

In the process of diauxic growth, cAMP plays an essential role. When the primary nutrient like glucose is exhausted, the decrease in its levels results in an increase in the level of cAMP, a cellular signaling molecule. This increase in cAMP concentration signals that the bacterial cell is running low on energy.
03

Role of CAP in Diauxic Growth

CAP, catabolite activator protein, is another crucial component in diauxic growth. Increased levels of cAMP indicate that the primary nutrient is being exhausted. In response, CAP, which is activated by binding to cAMP, induces the transcription of genes responsible for the utilization of the secondary nutrient. The CAP-cAMP complex thus facilitates the switch from the primary nutrient to the secondary nutrient.

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