Efficient Mass Spectral Analysis of Active Transporters Overexpressed in Escherichia coli

Mamiyo Kawakami, Narinobu Juge, Yuri Kato, Hiroshi Omote, Yoshinori Moriyama, Takaaki Miyaji

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Structural analysis of purified active membrane proteins can be performed by mass spectrometry (MS). However, no large-scale expression systems for active eukaryotic membrane proteins are available. Moreover, because membrane proteins cannot easily be digested by trypsin and ionized, they are difficult to analyze by MS. We developed a method for mass spectral analysis of eukaryotic membrane proteins combined with an overexpression system in Escherichia coli. Vesicular glutamate transporter 2 (VGLUT2/SLC17A6) with a soluble α-helical protein and histidine tag on the N- and C-terminus, respectively, was overexpressed in E. coli, solubilized with detergent, and purified by Ni-NTA affinity chromatography. Proteoliposomes containing VGLUT2 retained glutamate transport activity. For MS analysis, the detergent was removed from purified VGLUT2 by trichloroacetic acid precipitation, and VGLUT2 was then subjected to reductive alkylation and tryptic digestion. The resulting peptides were detected with 88% coverage by matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) MS with or without liquid chromatography. Vesicular excitatory amino acid transporter and vesicular acetylcholine transporter were also detected with similar coverage by the same method. Thus this methodology could be used to analyze purified eukaryotic active transporters. Structural analysis with chemical modifiers by MS could have applications in functional binding analysis for drug discovery.

Original languageEnglish
Pages (from-to)1108-1119
Number of pages12
JournalJournal of Proteome Research
Issue number3
Publication statusPublished - Mar 2 2018


  • matrix-assisted laser desorption ionization time-of-flight mass spectrometry
  • membrane protein
  • sequence coverage
  • trypsin digestion
  • vesicular glutamate transporter
  • vesicular neurotransmitter transporter

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)


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