Title of article :
In Vivo Processing of Nonanchored Yapsin 1 (Yap3p)
Author/Authors :
Olsen، نويسنده , , Vicki and Loh، نويسنده , , Y.Peng، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2000
Abstract :
A C-terminally truncated form of yapsin 1 (yeast aspartic protease 3) was overexpressed in yeast and its processing through the secretory pathway was followed by pulse-labeling and immunoprecipitation studies. In the soluble cell extract, three forms of yapsin 1—87, 74, and 18 kDa—were found. Identification of these forms of yapsin 1 using different antisera suggests that the 87-kDa form is pro-yapsin 1, which is processed into two subunits, α (18 kDa) and β (74 kDa), by cleavage at a loop region not found in traditional aspartic proteases. By use of a temperature-sensitive mutant strain, sec18, the generation of the two subunits was found to occur in the endoplasmic reticulum. An active site-mutated yapsin 1 was not processed into the two subunits, suggesting that this process occurs in an autocatalytic manner.
Keywords :
proprotein , aspartic protease
Journal title :
Archives of Biochemistry and Biophysics
Journal title :
Archives of Biochemistry and Biophysics