Lantibiotic Producer Screening
Lantibiotic Producer Screening - Related Videos
06:38
Use of the Soft-agar Overlay Technique to Screen for Bacterially Produced Inhibitory Compounds
0 Views •
Cited by 141 •
2017
We describe a simple method for screening bacterial cultures for the production of compounds inhibitory towards other bacteria.
01:29
The Producer Price Index
0 Views •
2025
Tracking producer-level price movements is a crucial element of economic analysis and business planning. The Producer Price Index (PPI) serves this purpose by capturing average changes in the prices domestic producers receive for their goods and services over time. As a forward-looking indicator, the PPI often signals inflationary pressures before they are felt by consumers.Understanding the Structure of the PPIUnlike consumer-focused indexes, the PPI is organized around the supply side of the...
12:16
High Throughput Quantitative Expression Screening and Purification Applied to Recombinant Disulfide-rich Venom Proteins Produced in E. coli
0 Views •
Cited by 29 •
2014
A protocol for the quantitative, high throughput expression screening and analytical purification of fusion proteins from small-scale Escherichia coli cultures is described and applied to the expression of disulfide-rich animal venom protein targets.
13:21
Antibody Generation: Producing Monoclonal Antibodies Using Hybridomas
0 Views •
2023
Source: Frances V. Sjaastad1,2, Whitney Swanson2,3, and Thomas S. Griffith1,2,3,4 1 Microbiology, Immunology, and Cancer Biology Graduate Program, University of Minnesota, Minneapolis, MN 55455 2 Center for Immunology, University of Minnesota, Minneapolis, MN 55455 3 Department of Urology, University of Minnesota, Minneapolis, MN 55455 4 Masonic Cancer Center, University of Minnesota, Minneapolis, MN 55455 Polyclonal antibodies are defined as a collection of antibodies directed against...
09:44
High-throughput Screening for Chemical Modulators of Post-transcriptionally Regulated Genes
0 Views •
2015
Here we describe a cell-based reporter gene assay as a valuable tool to screen chemical libraries for compounds modulating post-transcriptional control mechanisms exerted through 3’ UTR.
FAQs
The screen compares growth of an indicator bacterium near a candidate isolate or its cell-free supernatant with growth in areas lacking the test material. A clear inhibition zone provides visible evidence that the isolate released an antimicrobial substance. Because this result demonstrates activity rather than molecular identity, further peptide purification or genome analysis is needed to associate the activity with a lantibiotic.
The indicator bacterium acts as a biological detector for inhibitory activity. When exposed to a colony or cell-free supernatant containing an active compound, it fails to grow locally, producing a visible clear zone. Selection of the indicator therefore determines which antimicrobial effects become detectable and provides the initial phenotype used to prioritize isolates for additional characterization.
Peptide purification follows the active material and helps connect the observed inhibition to a specific antimicrobial peptide. Genome analysis adds a genetic perspective by identifying lantibiotic biosynthetic gene clusters, which can link peptide production to its underlying pathway. Using both approaches helps relate bioactivity to peptide structure and biosynthetic potential rather than relying on inhibition alone.
Researchers first associate the zone with a producing isolate, then examine the active material and the producer's genomic information. Purification can characterize the peptide responsible for activity, while a biosynthetic gene cluster provides evidence for how the organism may produce it. This combination connects an observable competitive phenotype with molecular structure and genetic pathways.
A typical workflow begins by growing environmental isolates or culture-collection organisms. Colonies or cell-free supernatants are then tested against an indicator bacterium, and visible growth-inhibition zones are recorded. Isolates showing activity can be prioritized for peptide purification and genome analysis, allowing researchers to investigate the compound and identify a corresponding biosynthetic gene cluster.
The method is useful when researchers want to discover antimicrobial compounds from microbial diversity and connect their activity with genetic pathways. Positive isolates can support studies of microbial competition, antibiotic discovery, and peptide biosynthesis. The resulting candidates may also be relevant to food preservation, biotechnology, or therapeutic research, depending on subsequent characterization.