Sudlow site II of human serum albumin remains functional after gold nanocluster encapsulation: a fluorescence-based drug binding study of L-Dopa

Ben A Russell, Ashley Garton, Abeer Saeed Alshammari, David J S Birch, Yu Chen

Research output: Contribution to journalArticle

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Abstract

Fluorescent protein-encapsulated gold nanoclusters (AuNCs) offer a non-toxic means of sensing and imaging biological phenomena on the nanoscale. However, the biofunctionality of proteins encapsulating AuNCs has not been fully elucidated to date. Here we studied the biofunctionality of the second major drug binding site (Sudlow II) of Human Serum Albumin (HSA) encapsulated AuNCs after AuNC synthesis. L-Dopa, a fluorescent drug molecule associated with the clinical treatment of Parkinson’s disease, which commonly binds to the Sudlow II site, was used to study the availability of the site before and after AuNC synthesis through changes to its fluorescence characteristics. L-Dopa was observed using its intrinsic fluorescence to readily bind to HSA-AuNCs complexes. Interestingly, the fluorescence emission intensity of AuNCs linearly increased with L-Dopa concentration while exciting the AuNC directly at 470 nm, Using a 400 nMHSA-AuNC solution, L-Dopa was rapidly detected at a limit of 300 pM, indicating that HSA-AuNCs fluorescence is extremely sensitive to molecular binding at the Sudlow II binding site. Future research may be able to utilize this sensitivity to improve the fluorescence characteristics of AuNCs within HSA-AuNCs for imaging and sensing including drug binding studies.
Original languageEnglish
Article number035017
Number of pages6
JournalMethods and Applications in Fluorescence
Volume6
Issue number3
Early online date20 Jun 2018
DOIs
Publication statusPublished - 2 Jul 2018

Keywords

  • protein encapsulated nanoclusters
  • drug binding
  • protein functionality
  • sudlow binding site
  • human serum albumin
  • fluorescent gold nanoclusters

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