A FACTOR FROM PEA COTYLEDONS THAT MODIFIES AUXIN-INDUCED ALPHA-AMYLASE IN-VITRO

被引:0
|
作者
HIRASAWA, E
HIGASHIMOTO, N
机构
[1] Department of Biology, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka
关键词
AFFINITY FOR STARCH; AUXIN-INDUCED ALPHA-AMYLASE (EC 3.2.1.1); COTYLEDON; MODIFICATION OF ALPHA-AMYLASE; PISUM SATIVUM;
D O I
10.1093/oxfordjournals.pcp.a078707
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
An auxin-induced a-amylase (AMY I; EC 3.2.1.1) with a low affinity for potato starch was purified to homogeneity from detached cotyledons of Pisum sativum, as judged by the presence of a single band after non-denaturing PAGE and SDS-PAGE. AMY I was compared with a previously purified auxin-induced alpha-amylase (AMY II) that had a higher affinity for potato starch. No difference between AMY I and AMY II was apparent after SDS-PAGE or isoelectric focusing (IEF) and rates of degradation of soluble starch were identical. However, AMY I was less active than AMY II in the degradation of starch granules. A factor that converted AMY II to AMY I in vitro was detected in a crude extract of detached cotyledons. The factor was heat-labile.
引用
收藏
页码:1141 / 1147
页数:7
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