The genetics of lantibiotic biosynthesis
R Jack1, G Bierbaum, C Heidrich
1Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria, Australia.
Summary
Lantibiotics are modified peptides from Gram-positive bacteria. Their complex biosynthesis involves precursor peptides, modification enzymes, and transport proteins, aiding in understanding these bioactive compounds.
Area of Science:
- Microbiology
- Biochemistry
- Molecular Biology
Background:
- Lantibiotics are a growing class of bioactive peptides.
- Produced by Gram-positive bacteria, they contain lanthionine and beta-methyllanthionine.
- These unusual amino acids result from post-translational modification of precursor peptides.
Purpose of the Study:
- To analyze genes involved in lantibiotic biosynthesis.
- To understand the complex mechanisms of lantibiotic production.
- To elucidate the roles of various gene products in lantibiotic pathways.
Main Methods:
- Identification and analysis of genes encoding lantibiotic biosynthesis.
- Characterization of enzymes, proteases, and transport proteins.
- Study of regulatory and protective proteins.
Main Results:
- Several genes crucial for lantibiotic biosynthesis have been identified.
- These include genes for precursor peptides, modification enzymes, leader peptide removal, and transport.
- Regulatory and self-protection proteins were also characterized.
Conclusions:
- Analysis of identified genes provides insight into lantibiotic biosynthesis.
- Understanding these genetic components enhances knowledge of these complex peptides.
- Further research on these genes will illuminate lantibiotic production mechanisms.
Related Concept Videos
00:57Antibiotic Selection
Overview
01:58Prokaryotic Transcriptional Activators and Repressors
The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
Transcription of prokaryotic...
Transcription of prokaryotic...
01:30Development of Antibiotic Resistance
Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
01:27Production of Antibiotics
Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
01:30Production of Pharmaceuticals
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...
01:25Mechanism of Antibiotic Resistance in MRSA
Antibiotic resistance in bacteria arises when microorganisms evolve the ability to withstand drugs designed to kill them or inhibit their growth, rendering once-effective treatments useless. This phenomenon, driven by genetic change and selection under antibiotic exposure, poses a profound threat to modern medicine. Mechanisms include drug-inactivating enzymes (e.g., β-lactamases), efflux pumps that eject antibiotics, mutations altering antibiotic targets, decreased drug uptake, and acquisition...