期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1971
卷号：68
期号：7
页码：1402-1406
DOI：10.1073/pnas.68.7.1402
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The turnover of two homotetramers of catalase, V4 and Z4, specified by genes at two separate loci, has been studied during germination of maize seed by the techniques of density labeling and starch-gel electrophoresis. Both isozymes were shown to be turning over during this time. However, Z4 accumulates because the rate of synthesis exceeds the rate of degradation, whereas V4 slowly disappears because the rate of degradation exceeds the rate of synthesis. Evidence is also presented that the rate of synthesis of Z4 exceeds that of V4, which suggests that this may be a major factor in the differential expression of the two catalase genes.
