Triosephosphate isomerase (EC 5.3.1.1., TPI) undergoes specific posttranslational modifications (deamidation and oxidation) which are believed to initiate protein turnover by destabilization of the dimer. The crystal structures, amino acid sequences, and aging related changes of TPI from various species have been independently characterized by several laboratories. TPI has thus become the prototype enzyme for examining the initial steps in protein turnover. The binding of substrate enhances the specific deamidation of the mammalian enzyme, and a general mechanism of 'molecular wear and tear' [Gracy, R. W., Yiiksel, K. 0., Chapman, M. L., and Dimitrijevich, S. D. (1990) in Isozymes-Structure, Function and Use in Biology and Medicine (Ogita, Z-I., and Markert, C. L., Eds) pp. 787-817, Wiley-Liss, New York] has been proposed to explain how enzymes may wear out.
| Identifer | oai:union.ndltd.org:unt.edu/info:ark/67531/metadc798116 |
| Date | 12 1900 |
| Creators | Sun, An-Qiang |
| Publisher | University of North Texas |
| Source Sets | University of North Texas |
| Language | English |
| Detected Language | English |
| Type | Thesis or Dissertation |
| Format | xi, 193 leaves : ill., Text |
| Rights | Public, Sun, An-Qiang, Copyright, Copyright is held by the author, unless otherwise noted. All rights |
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