Transglutaminase-mediated internal protein labeling with a designed peptide loop

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16 Citations (Scopus)


Post-translational internal protein labeling was explored through the insertion of a 13-mer peptidyl loop specifically recognized by microbial transglutaminase (MTG). The peptidyl loop included one lysine residue (abbreviated as the K-loop), and was designed and inserted into two different regions of the protein bacterial alkaline phosphatase (BAP). MTG-mediated selective labeling of a lysine residue in the K-loop was achieved with a functional Gln-donor substrate. Internal protein labeling in the vicinity of the active site of BAP (residues 91-93) markedly decreased the activity of the enzyme. Conversely, insertion of the K-loop at a site distal from the active site (residues 219-221) afforded site-specific and covalent internal protein labeling without impairing the activity of the enzyme.

Original languageEnglish
Pages (from-to)829-833
Number of pages5
JournalBiochemical and Biophysical Research Communications
Issue number4
Publication statusPublished - Jul 15 2011

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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