Abstract:
:Transglutaminase 2 (TGase 2) is a bifunctional enzyme that catalyzes calcium-dependent transamidation and GTP binding/hydrolysis. The transamidation activity is proposed to be associated with several neurodegenerative disorders such as Alzheimer's and Hungtinton's disease. However, the regulation mechanism by which TGase 2 causes neurodegeneration is unknown. In this study, we show that two activities of TGase 2 have a differential stability; transamidation activity is less stable than GTP hydrolytic activity, and that GTP was required to stabilize and to display transamidation activity. Moreover, GTP binding-defective mutant of TGase 2 did not show any transamidation activity in transfection experiments. These results indicate that GTP binding is crucial for transamidation activity of TGase 2, suggesting that protein cross-linking by TGase 2 might be associated with G-protein coupled receptor signaling system. Thus, our data could contribute to understand the regulation of TGase 2 activity and TGase 2-associated pathogenesis.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Jeon JH,Cho SY,Kim CW,Shin DM,Kweon JC,Choi KH,Park SC,Kim IGdoi
10.1016/S0006-291X(02)00582-Xsubject
Has Abstractpub_date
2002-06-21 00:00:00pages
818-22issue
4eissn
0006-291Xissn
1090-2104pii
S0006-291X(02)00582-Xjournal_volume
294pub_type
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