Random substitution of large parts of the propeptide of yeast proteinase A
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The yeast aspartic protease, proteinase A, has a 54 amino-acid propeptide, which is removed during activation of the zymogen in the vacuole. Apart from being involved inhibition/activation, the propeptide has been shown to be essential for formation of a stable active enzyme (van den Hazel, H. B., Kielland-Brandt, M. C., and Winther, J. R. (1993) J. Biol. Chem. 268, 18002-18007). We have investigated the sequence requirements for function of the propeptide. The N-terminal half and the C-terminal half of the propeptide were replaced by random sequences at the genetic level, and collections of the mutants were subjected to a colony screen for ones exhibiting activity. A high frequency (around 1%) of active constructs was found, which indicates a very high tolerance for mutations in the propeptide. Thirty-nine functional mutant forms containing random sequence at either the N- or C-terminal half of the propeptide were characterized. Comparison of the propeptides of the active constructs suggests that a particular lysine residue is important for efficient biosynthesis of proteinase A.
Originalsprog | Engelsk |
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Tidsskrift | Journal of Biological Chemistry |
Vol/bind | 270 |
Udgave nummer | 15 |
Sider (fra-til) | 8602-9 |
Antal sider | 8 |
ISSN | 0021-9258 |
Status | Udgivet - 1995 |
ID: 43974368