Journal
ANALYTICAL CHEMISTRY
Volume 81, Issue 4, Pages 1378-1382Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac802099c
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Funding
- Korea Environmental Industry & Technology Institute (KEITI) [20081000100320] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [과C6A1903, 과C6A1902, R01-2006-000-10239-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The detection and characterization of protein aggregates are critical in terms of advanced diagnostic applications and investigations of protein stability. A variety of analytical methods (e.g., circular dichroism, size exclusion chromatography, and fluorescence microscopy) have been used in this regard, but they are limited in the trace detection of the structural evolution of protein aggregation. Here we report the gold nanoparticle (AuNP)-based highly sensitive and colorimetric detection of the temporal evolution of superoxide dismutase (SOD1) aggregates implicated in the pathology of amyotrophic lateral sclerosis (ALS). For the temporal discrimination of SOD1 aggregation, AuNPs were conjugated with SOD1 monomers (SOD1-AuNPs). Upon exposure of the probes (SOD1 AuNPs) with SOD 1 aggregates, significant changes in both surface plasmon resonance spectra and concomitant colors were observed which are attributed to the formation of probe aggregates of variable sizes onto the SOD1 aggregates.
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