Characterization of purified rat testicular transglutaminase and age-dependent changes of the enzyme activities

Yu Wei Wu, Wen Fu Thomas Lai, Yu Hui Tsai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The Ca 2+-dependent tissue transglutaminase is widely distributed in various tissues and has been reported to participate in many cellular growth and differentiation processes. In the past decade, tissue transglutaminase is also identified as a G protein, G αh, for intercellular signaling. To further characterize testicular transglutaminase, the rat testicular transglutaminase was purified by ammonium sulfate precipitation, DEAE ion-exchange, heparin-agarose, and GTP-agarose affinity chromatographies. This purification protocol resulted in a 8400-fold enrichment of the enzyme with a reproducible 15% yield. The purified enzyme showed as a single band of 78 kDa on SDS-polyacrylamide gel. Western blot analysis using anti-liver tissue transglutaminase monoclonal antibody also recognized the enzyme, indicating it is a t-TGase in nature. The K m values of purified testicular transglutaminase for putrescine and N,N-dimethylcasein were determined to be 35 and 17 μM, respectively. Its transglutaminase cross-linking activity was strongly inhibited by EGTA, GTP, polyamines, and cystamine, as well as moderately by ATP and NaCl. The enzyme exhibited a magnesium-dependent GTP-hydrolyzing capacity, but its GTP-binding activity did not require magnesium. Furthermore, the enzyme activity was found to be closely related with the first wave of spermatogenesis. Thus, testicular transglutaminase is speculated to participate in the event of spermatogenesis. In conclusion, the purified testicular transglutaminase displays property of either the tissue-type transglutaminase, or the GTP-binding and hydrolyzing characteristics. The activity of testicular transglutaminase is age-dependent, greatly stimulated during the first wave of spermatogenesis.

Original languageEnglish
Pages (from-to)386-396
Number of pages11
JournalInternational Journal of Biochemistry and Cell Biology
Volume37
Issue number2
DOIs
Publication statusPublished - Feb 2005

Fingerprint

Transglutaminases
Enzyme activity
Rats
Guanosine Triphosphate
Enzymes
Spermatogenesis
Magnesium
Cystamine
Affinity chromatography
Agarose Chromatography
Putrescine
Ion Exchange
Egtazic Acid
Polyamines
Ammonium Sulfate
Affinity Chromatography
GTP-Binding Proteins
Liver
Purification
Ion exchange

Keywords

  • Enzyme kinetics
  • G-protein
  • GTPase
  • Rat testes
  • Transglutaminase

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology

Cite this

Characterization of purified rat testicular transglutaminase and age-dependent changes of the enzyme activities. / Wu, Yu Wei; Lai, Wen Fu Thomas; Tsai, Yu Hui.

In: International Journal of Biochemistry and Cell Biology, Vol. 37, No. 2, 02.2005, p. 386-396.

Research output: Contribution to journalArticle

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