Amino Acids

, Volume 44, Issue 1, pp 209–214 | Cite as

Transglutaminase 2 and Factor XIII catalyze distinct substrates in differentiating osteoblastic cell line: utility of highly reactive substrate peptides

  • Kazuya Watanabe
  • Kanako Tsunoda
  • Miho Itoh
  • Mina Fukui
  • Hitoshi Mori
  • Kiyotaka HitomiEmail author
Original Article


Differentiated osteoblastic cell line, MC3T3-E1 expresses transglutaminase 2 (TG2) and Factor XIII (FXIII). In previous studies, we identified isozyme-specific and highly reactive glutamine-donor substrate peptides (pepF11KA and pepT26) for each isozyme. Using these peptides, we compared the reaction products with lysine-donor substrates for each isozyme in differentiating MC3T3-E1 cells. By this analysis, distinct substrates for the activated TG2 and FXIII were detected in cultured cellular extract. Possible substrates that incorporated biotin-labeled peptides were further purified using streptavidin-affinity chromatography. Several isozyme-specific substrates were identified by mass spectrometry analysis of the purified fractions. These analyses also indicate the benefit of the substrate peptides for obtaining distinct substrates in a reaction mixture where two isozymes co-exist.


Transglutaminase Osteoblast TG2 Factor XIII 



l-ascorbic acid 2-phosphate


Coomassie Brilliant Blue




Transglutaminase 2


Factor XIII



We greatly appreciate Dr. Masatoshi Maki and Dr. Hideki Shibata in our laboratory for providing valuable suggestions. This work was supported by a Grant-in-Aid for Scientific Research on Innovative Areas (No. 20200072) (to K. H.) from the Ministry of Education, Sports, Science and Technology (MEXT, Japan).


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Kazuya Watanabe
    • 1
  • Kanako Tsunoda
    • 1
  • Miho Itoh
    • 1
  • Mina Fukui
    • 1
  • Hitoshi Mori
    • 2
  • Kiyotaka Hitomi
    • 1
    Email author
  1. 1.Department of Applied Molecular BiosciencesGraduate School of Bioagricultural Sciences, Nagoya UniversityNagoyaJapan
  2. 2.Department of Bioengineering SciencesGraduate School of Bioagricultural Sciences, Nagoya UniversityNagoyaJapan

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