Heat stability of the potato tuber ADP-glucose pyrophosphorylase: Role of cys residue 12 in the small subunit

被引:21
作者
Ballicora, MA [1 ]
Fu, YB [1 ]
Frueauf, JB [1 ]
Preiss, J [1 ]
机构
[1] Michigan State Univ, Dept Biochem, E Lansing, MI 48824 USA
关键词
D O I
10.1006/bbrc.1999.0469
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Most of the ADP-glucose pyrophosphorylases from different sources are stable to a heat treatment. We found that in the potato (Solanum tuberosum L.) tuber enzyme, the intermolecular disulfide bridge located between Cys(12) of the small subunits is responsible for the stability at 60 degrees C. When this unique disulfide bond is cleaved the enzyme is stable up to 40 degrees C. Mutation of Cys(12) in the small subunit into either Ala or Ser yielded enzymes with stability similar to the reduced form of the wild type. Concurrently, the enzyme with a truncated small subunit on the N-terminal was stable only up to 40 degrees C. Thus, the N-terminal is important for the stability of the enzyme because of the presence of a disulfide bond. (C) 1999 Academic Press.
引用
收藏
页码:782 / 786
页数:5
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