Liquid Extraction Surface Analysis for Native Mass Spectrometry: Protein Complexes and Ligand Binding

Victor Mikhailov, Rian Griffiths, Helen Cooper

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Abstract


Native liquid extraction surface analysis (LESA) mass spectrometry enables the direct sampling of protein complexes from a solid surface. We have previously demonstrated native LESA mass spectrometry of holomyoglobin (∼17 kDa) from glass slides and tetrameric haemoglobin (∼64 kDa) from dried blood spots and thin tissue sections. Here, we further explore the capabilities of this emerging technique by investigating a range of proteins which exist in various oligomeric states in vivo. Tetrameric avidin (∼64 kDa), octameric (∼190 kDa) and hexadecameric (∼380 kDa) CS2 hydrolase, and tetradecameric GroEL (∼800 kDa) were all detected by native LESA mass spectrometry. Moreover, trimeric AmtB, a membrane protein, could also be observed by native LESA mass spectrometry. The suitability of LESA mass spectrometry for probing protein-ligand binding was also investigated. Non-covalent complexes of the ligand biotin with the proteins avidin, haemoglobin and bovine serum albumin were detected. The results indicate that non-specific binding is minimal and that native LESA mass spectrometry is a promising tool for the investigation of biologically significant ligand binding.
Original languageEnglish
JournalInternational Journal of Mass Spectrometry
Early online date21 Sept 2016
DOIs
Publication statusE-pub ahead of print - 21 Sept 2016

Keywords

  • liquid extraction surface analysis (LESA)
  • native mass spectrometry
  • non-covalent protein complexes
  • protein-ligand interactions
  • drug binding

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