Identification, purification and characterisation of extracellular bacterial proteins such as amyloids: Identification, purification and characterisation of bacterial amyloids
Author
Nielsen, Rico
Term
4. term
Education
Publication year
2004
Submitted on
2004-10-01
Pages
69
Abstract
Functional bacterial amyloids (FuBA) are extracellular protein fibers that can shape biofilms and influence technology and human health. This project aimed to screen environmental isolates for FuBA expression, to purify amyloid material, and to begin characterizing it. Biofilms were probed with a conformation-specific antibody that recognizes the amyloid fold, indicating FuBA on bacterial surfaces. Purification attempts yielded putative amyloid preparations in a few cases, but co-purifying contaminants prevented definitive validation. These findings suggest that purification workflows must be optimized and likely tailored to individual organisms rather than relying on a universal protocol. As a proof of concept, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) on intact bacteria was explored to detect surface-exposed amyloids and showed promising potential. Overall, the work supports the presence of functional amyloids in environmental biofilms while highlighting the technical challenges that remain in their purification and analysis.
Funktionelle bakterielle amyloider (FuBA) er ekstracellulære proteinfibre, som kan påvirke både biofilmdannelse, teknologi og menneskers sundhed. Dette projekt havde til formål at screene miljøisolater for ekspression af FuBA, at oprense sådant materiale og at påbegynde karakterisering. Biofilm blev undersøgt med et konformationsspecifikt antistof, der genkender den amyloide foldning, hvilket indikerede tilstedeværelse af FuBA på bakterieoverflader. Forsøg på oprensning gav i nogle få tilfælde materiale foreneligt med FuBA, men medfølgende kontaminanter forhindrede endelig validering. Resultaterne peger på, at oprensningsprotokoller skal optimeres og sandsynligvis tilpasses de enkelte organismer frem for at bero på en universel metode. Som proof-of-concept blev attenueret totalreflektans-Fourier-transform infrarød spektroskopi (ATR-FTIR) af hele bakterier anvendt til at afsøge overfladeeksponerede amyloider og viste lovende potentiale. Samlet set understøtter arbejdet tilstedeværelsen af funktionelle amyloider i miljøbiofilm og fremhæver de tekniske udfordringer, der stadig består i deres oprensning og analyse.
[This apstract has been generated with the help of AI directly from the project full text]