Transglutaminase 2 (TG2) is a calcium-dependent multifunctional protein associated with various human diseases. We determined the crystal structure of human TG2 in complex with adenosine triphosphate (ATP). The ATP molecule binds to the previously identified guanosine diphosphate (GDP) binding pocket but has different hydrogen bonds and ion interaction with protein. The four residues Arg476, Arg478, Val479 and Tyr583, all of which are involved in both ATP and GDP binding by hydrogen bonds, might play important roles in the stabilization of TG2 by ATP or GDP. However, Ser482 and Arg580, which are involved in GDP binding, do not form hydrogen bond with ATP. Additionally, we newly discovered an intramolecular disulfide bond between Cys230 and Cys370, which formation might regulate the enzymatic activity of TG2.
Crystal structure of human transglutaminase 2 in complex with adenosine triphosphate.,Han BG, Cho JW, Cho YD, Jeong KC, Kim SY, Lee BI Int J Biol Macromol. 2010 Aug 1;47(2):190-5. Epub 2010 May 5. PMID:20450932
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↑ Han BG, Cho JW, Cho YD, Jeong KC, Kim SY, Lee BI. Crystal structure of human transglutaminase 2 in complex with adenosine triphosphate. Int J Biol Macromol. 2010 Aug 1;47(2):190-5. Epub 2010 May 5. PMID:20450932 doi:10.1016/j.ijbiomac.2010.04.023