alexa Full-length and N-TIMP-3 display equal inhibitory activities toward TNF-alpha convertase.
Surgery

Surgery

Journal of Transplantation Technologies & Research

Author(s): Lee MH, Knuper V, Becherer JD, Murphy G

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Abstract We previously reported that tumor necrosis factor-alpha converting enzyme (TACE) was specifically inhibited by TIMP-3 but not TIMP-1, -2, and -4. Further mutagenesis studies showed that the N-terminal domain of TIMP-3 (N-TIMP-3) retained full inhibitory activity towards TACE. Full-length TIMP-3 and N-TIMP-3 exhibited indistinguishable values for the association rate constant and inhibitory affinity constant for the active catalytic domain of TACE (k(on) approximately 10(5) M(-1) s(-1) and K(app)(i) approximately 0.20 nM). Moreover, their k(on) (approximately 10(4) M(-1) s(-1)) and K(app)(i) (approximately 1.0 nM) values with a longer form of TACE (which encompasses the complete ectodomain including disintegrin, EGF and Crambin-like domains) were also shown to be similar. Detailed kinetic analyses indicated that TIMP-3 associated more quickly and with tighter final binding with TACE devoid of these C-terminal domains. We conclude that, unlike the interaction between many MMPs and TIMPs, the C-terminal domains of TIMP-3 and TACE are not essential in the formation of a tight binary complex. Copyright 2001 Academic Press. This article was published in Biochem Biophys Res Commun and referenced in Journal of Transplantation Technologies & Research

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