Question

Which type of Bacteriocin is produced by Pediococcus acidilactici?

• A. Pediocin I
• B. Lactolin
• C. Diplococcin
• D. Acidolin

Hint:

Pediocin PA-1/I is highly stable across a wide pH range (2.0 to 9.0) and resistant to high heat processing, making it one of the most promising natural bio-preservatives in the meat and dairy industries.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
Bacteriocins are ribosomally synthesized, antimicrobial peptide toxins produced by bacteria (specifically lactic acid bacteria) to inhibit the growth of closely related bacterial strains. They are used as natural biopreservatives in food.

Step 2: Detailed Explanation:
The homofermentative lactic acid bacterium Pediococcus acidilactici produces a highly potent, anti-listerial Class IIa bacteriocin known as Pediocin PA-1 (commonly referred to as Pediocin I).
It inhibits pathogenic Gram-positive bacteria, particularly the major foodborne pathogen Listeria monocytogenes, by destabilizing and permeabilizing their cytoplasmic membranes.
- Diplococcin is produced by *Lactococcus lactis*.
- Acidolin is produced by *Lactobacillus acidophilus*.

Step 3: Final Answer:
The bacteriocin produced is Pediocin I, which corresponds to option (A).